Tony Pearson is a Master Inventor and Senior IT Architect for the IBM Storage product line at the
IBM Executive Briefing Center in Tucson Arizona, and featured contributor
to IBM's developerWorks. In 2016, Tony celebrates his 30th year anniversary with IBM Storage. He is
author of the Inside System Storage series of books. This blog is for the open exchange of ideas relating to storage and storage networking hardware, software and services.
(Short URL for this blog: ibm.co/Pearson )
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IBM Tivoli Storage Productivity Center v4.2.2 Overview and Update
This was an updated version of the presentation I gave last July in Orlando, Florida (see my post [IBM Storage University - Day 1]). Since it might have been awhile since the Australian audience had heard about the latest and greatest for Tivoli Storage Productivity Center, I decided to cover the enhancements of 4.2.0, 4.2.1 and 4.2.1 combined.
IBM Tivoli Storage Productivity Center is an important part of IBM's "Storage Hypervisor" solution, combining a single pane of glass for management with non-disruptive storage virtualization with SVC and Storwize V7000.
IBM Storwize V7000 and SVC integration with VMware
Alexi Giral from IBM Sydney presented this session on how Storwize V7000 and SVC serve as the "Storage Hypervisor" for VMware server virtualization environments. The focus was on the FCP and iSCSI block-only access modes of these devices, although one could use IBM Storwize V7000 Unified to provide NFS file-level access to VMware. Alexi covered both VMware Vsphere v4 and v5, as there are a few differences.
IBM Storwize V7000 and SVC supports thin provisioning, VMware's VAAI interface, VMware's Site Recovery Manager, and provides a storage management plug-in to Vmware's vCenter. The SVC has extended the distance for split-cluster configurations that support VMware's vMotion live partition mobility and High Availiability (HA) up to 300km using active DWDM.
Tape Storage Reinvented: What's New and Exciting in the Tape World?
Special thanks to Jim Fisher and Jim Karp for providing me this presentation, videos and supporting materials for me to present this session. I gave this as the first break-out session on Tuesday, and then repeated as the last break-out session on Thursday. Several of the attendees in the audience mocked my title, with taunts like "What could be NEW or EXCITING about tape?" I covered four key areas:
The new TS1140 tape drive, including the corresponding model-JC tape that holds 4TB native (12 TB compressed!).
The enhanced TS3500 with the Tape Library Connector Shuttle. I had a video that shows how tapes can be sent from one TS3500 tape library string to another.
The new Linear Tape File System (LTFS), both the single drive edition and the library edition
The new 3592-C07 FICON controller for our mainframe clients
By the end of the session, the folks that taunted me were honestly impressed that they learned a few things, and had not realized so much has been developed recently in the world of tape.
Continuing my coverage of the [IBM System x and System Storage Technical Symposium], I thought I would start with some photos. I took these with cell phone, and without realizing how much it would cost, uploaded them to Flickr at international data roaming rates. Oops!
Here are some of the banners used at the conference. Each break-out session room was outfitted with a "Presentation Briefcase" that had everything a speaker might need, including power plug adapters and dry-erase markers for the whiteboard. What a clever idea!
Here is a recap of the last and final day 3:
Understanding IBM's Storage Encryption Options
Special thanks to Jack Arnold for providing me his deck for this presentation. I presented IBM's leadership in encryption standards, including the [OASIS Key Management Interoperability Protocol] that allows many software and hardware vendors to interoperate. IBM offers the IBM Tivoli Key Lifecycle Manager (TKLM v2) for Windows, Linux, AIX and Solaris operating systems, and the IBM Security Key Lifecycle Manager (v1.1) for z/OS.
Encrypting data at rest can be done several ways, by the application at the host server, in a SAN-based switch, or at the storage system itself. I presented how IBM Tivoli Storage Manager, the IBM SAN32B-E4 SAN switch, and various disk and tape devices accomplish this level of protection.
NAS @ IBM
Rich Swain, IBM Field Technical Sales Specialist for NAS solutions, provided an overview of IBM's NAS strategy and the three products: Scale-Out Network Attached Storage (SONAS), Storwize V7000 Unified, and N series.
IBM System Networking Convergence CEE/DCB/FCoE
Mike Easterly, IBM Global Field Marketing Manager for IBM System Networking, presented on Network convergence. He wants to emphasize that "Convergence is not just FCoE!" rather it is bringing together FCoE with iSCSI, CIFS, NFS and other Ethernet-based protocols. In his view, "All roads lead to Ethernet!"
There are a lot new standards that didn't exist a few years ago, such as PCI-SIG's Single Root I/O Virtualization [SR-IOV], Virtual Ethernet Port Aggregator [VEPA], and [VN-Tag], Data Center Bridging [DCB], Layer-2 Multipath [L2MP], and my favorite: Transparent Interconnect of Lots of Links [TRILL].
Last year, IBM acquired Blade Network Technologies (BNT), which was the company that made IBM BladeCenter's Advanced Management Module (AMM) and BladeCenter Open Fabric Manager (BOFM). BNT also makes Ethernet switches, so it has been merged with IBM's System Storage team, forming the IBM System Storage and Networking team. Most of today's 10GbE is either fiber optic, Direct Attach Copper (DAC) that supports up to 8.5 meter length cables, or 10GBASE-T which provides longer distances of twisted pair. IBM's DS3500 uses 10GBASE-T for its 10GbE iSCSI support.
Last month, IBM announced 40GbE! I missed that one. The IT industry also expects to deliver 100GbE by 2013. For now, these will be used as up-links between other switches, as most servers don't have the capacity to pump this much data through their buses. With 40GbE and 100GbE, it would be hard to ignore Ethernet as the common network standard to drive convergence.
Fibre Channel, such as FCP and FICON, are still the dominant storage networking technology, but this is expected to peak around 2013 and start declining thereafter in favor of iSCSI, NAS and FCoE technologies. Already the enhancements like "Priority-based Flow Control" made to Ethernet to support FCoE have also helped out iSCSI and NAS deployments as well.
The iSCSI protocol is being used with Microsoft Exchange, PXE Boot, Server virtualization hypervisors like VMware and Hyper-V, as well as large Database and OLTP. IBM's SVC, Storwize V7000, XIV, DS5000, DS3500 and N series all support iSCSI.
IBM's [RackSwitch] family of products can help offload traffic at $500 per port, compared to traditional $2000 per port for IBM SAN32B or Cisco Nexus5000 converged top-of-rack switches.
IBM's System Networking strategy has two parts. For Ethernet, offer its own IBM System Networking product line as well as continue its partnership with Juniper Networks. For Fibre Channel and FCoE, continue strategic partnerships with Brocade and Cisco. IBM will lead the industry, help drive open standards to adopt Converged Enhanced Ethernet (CEE), provide flexibility and validate data center networking solutions that work end-to-end.
Well, it's Tuesday, and you know what that means... IBM announcements!
In today's environment, clients expect more from their storage, and from their storage provider. The announcements span the gamut, from helping to use Business Analytics to analyze Big Data for trends, insights and patterns, to managing private, public and hybrid cloud environments, all with systems that are optimized for their particular workloads.
There are over a dozen different announcements, so I will split these up into separate posts. Here is part 1.
IBM Scale Out Network Attach Storage (SONAS) R1.3
I have covered [IBM SONAS] for quite some time now. Based on IBM's General Parallel File System (GPFS), this integrated system combines servers, storage and software into a fully functional scale-out NAS solution that support NFS, CIFS, FTP/SFTP, HTTP/HTTPS, and SCP protocols. IBM continues its technical leadership in the scale-out NAS marketplace with new hardware and software features.
The hardware adds new disk options, with 900GB SAS 15K RPM drives, and 3TB NL-SAS 7200 RPM drives. These come in 4U drawers of 60 drives each, six ranks of ten drives each. So, with the high-performance SAS drives that would be about 43TB usable capacity per drawer, and with the high-capacity NL-SAS drives about 144TB usable. You can have any mix of high-performance drawers and high-capacity drawers, up to 7200 drives, for a maximum usable capacity of 17PB usable (21PB for those who prefer it raw). This makes it the largest commercial scale-out NAS in the industry. This capacity can be made into one big file system, or divided up to 256 smaller file systems.
In addition to snapshots of each file system, you can divide the file system up into smaller tree branches and snapshot these independently as well. The tree branches are called fileset containers. Furthermore, you can now make writeable clones of individual files, which provides a space-efficient way to create copies for testing, training or whatever.
Performance is improved in many areas. The interface nodes now can support a second dual-port 10GbE, and replication performance is improved by 10x.
SONAS supports access-based enumeration, which means that if there are 100 different subdirectories, but you only have authority to access five of them, then that's all you see, those five directories. You don't even know the other 95 directories exist.
I saved the coolest feature for last, it is called Active Cloud Engine™ that offers both local and global file management. Locally, Active Cloud Engine placement rules to decide what type of disk a new file should be placed on. Management rules that will move the files from one disk type to another, or even migrates the data to tape or other externally-managed storage! A high-speed scan engine can rip through 10 million files per node, to identify files that need to be moved, backed up or expired.
Globally, Active Cloud Engine makes the global namespace truly global, allowing the file system to span multiple geographic locations. Built-in intelligence moves individual files to where they are closest to the users that use them most. This includes an intelligent push-over-WAN write cache, on-demand pull-from-WAN cache for reads, and will even pre-fetch subsets of files.
No other scale-out NAS solution from any other storage vendor offers this amazing and awesome capability!
IBM® Storwize® V7000
Last year, we introduced the [IBM Storwize V7000], a midrange disk system with block-level access via FCP and iSCSI protocols. The 2U-high control enclosure held two cannister nodes, a 12-drive or 24-drive bay, and a pair of power-supply/battery UPS modules. The controller could attach up to nine expansion enclosures for more capacity, as well as virtualize other storage systems. This has been one of our most successful products ever, selling over 100PB in the past 12 months to over 2,500 delighted customers.
The 12-drive enclosure now supports both 2TB and 3TB NL-SAS drives. The 24-drive enclosures support 200/300/400GB Solid-State Drives (SSD), 146 and 300GB 15K RPM drives, 300/450/600GB 10K RPM drives, and a new 1TB NL-SAS drive option. For those who want to set up "Flash-and-Stash" in a single 2U drawer, now you can combine SSD and NL-SAS in the 24-drive enclosure! This is the perfect platform for IBM's Easy Tier sub-LUN automated tiering. IBM's Easy Tier is substantially more powerful and easier to use than EMC's FAST-VP or HDS's Dynamic Tiering.
Last week, at Oracle OpenWorld, there were various vendors hawking their DRAM/SSD-only disk systems, including my friends at Texas Memory Systems, Pure Storage, and Violin Memory Systems. When people came to the IBM booth to ask what IBM offers, I explained that both the IBM DS8000 and the Storwize V7000 can be outfitted in this manner. With the Storwize V7000, you can buy as much or little SSD as you like. You do not have to buy these drives in groups of 8 or 16 at a time.
The Storwize V7000 is the sister product of the IBM SAN Volume Controller, so you can replicate between one and the other. I see two use cases for this. First, you might have a SVC at a primary location, and decide to replicate just the subset of mission-critical production data to a remote location, and use the Storwize V7000 as the target device. Secondly, you could have three remote or branch offices (ROBO) that replicate to a centralized data center SAN Volume Controller.
Lastly, like the SVC, the Storwize V7000 now supports clustering so that you can now combine multiple control enclosures together to make a single system.
IBM® Storwize® V7000 Unified
Do you remember how IBM combined the best of SAN Volume Controller, XIV and DS8000 RAID into the Storwize V7000? Well, IBM did it again, combining the best of the Storwize V7000 with the common NAS software base developed for SONAS into the new "Storwize V7000 Unified".
You can upgrade your block-only Storwize V7000 into a file-and-block "Storwize V7000 Unified" storage system. This is a 6U-high system, consisting of a pair of 2U-high file modules connected to a standard 2U-high control enclosure. Like the block-only version, the control enclosure can attach up to nine expansion enclosures, as well as all the same support to virtualize external disk systems. The file modules combine the management node, interface node and storage node functionality that SONAS R1.3 offers.
What exactly does that mean for you? In addition to FCP and iSCSI for block-level LUNs, you can carve out file systems that support NFS, CIFS, FTP/SFTP, HTTP/HTTPS, and SCP protocols. All the same support as SONAS for anti-virus checking, access-based enumeration, integrated TSM backup and HSM functionality to migrate data to tape, NDMP backup support for other backup software, and Active Cloud Engine's local file management are all included!
IBM SAN Volume Controller V6.3
The SAN Volume Controller [SVC] increases its stretched cluster to distances up to 300km. This is 3x further than EMC's VPLEX offering. This allows identical copies of data to be kept identical in both locations, and allows for Live Partition Mobility or VMware vMotion to move workloads seamlessly from one data center to another. Combining two data centers with an SVC stretch cluster is often referred to as "Data Center Federation".
The SVC also introduces a low-bandwidth option for Global Mirror. We actually borrowed this concept from our XIV disk system. Normally, SVC's Global Mirror will consume all the bandwidth it can to keep the destination copy of the data within a few seconds of currency behind the source copy. But do you always need to be that current? Can you afford the bandwidth requirements needed to keep up with that? If you answered "No!" to either of these, then the low-bandwidth option is you. Basically, a FlashCopy is done on the source copy, this copy is then sent over to the destination, and a FlashCopy is made of that. The process is then repeated on a scheduled basis, like every four hours. This greatly reduces the amount of bandwidth required, and for many workloads, having currency in hours, rather than seconds, is good enough.
I am very excited about all these announcements! It is a good time to be working for IBM, and look forward to sharing these exciting enhancements with clients at the Tucson EBC.
Over on the Tivoli Storage Blog, there is an exchange over the concept of a "Storage Hypervisor". This started with fellow IBMer Ron Riffe's blog post [Enabling Private IT for Storage Cloud -- Part I], with a promise to provide parts 2 and 3 in the next few weeks. Here's an excerpt:
"Storage resources are virtualized. Do you remember back when applications ran on machines that really were physical servers (all that “physical” stuff that kept everything in one place and slowed all your processes down)? Most folks are rapidly putting those days behind them.
In August, Gartner published a paper [Use Heterogeneous Storage Virtualization as a Bridge to the Cloud] that observed “Heterogeneous storage virtualization devices can consolidate a diverse storage infrastructure around a common access, management and provisioning point, and offer a bridge from traditional storage infrastructures to a private cloud storage environment” (there’s that “cloud” language). So, if I’m going to use a storage hypervisor as a first step toward cloud enabling my private storage environment, what differences should I expect? (good question, we get that one all the time!)
The basic idea behind hypervisors (server or storage) is that they allow you to gather up physical resources into a pool, and then consume virtual slices of that pool until it’s all gone (this is how you get the really high utilization). The kicker comes from being able to non-disruptively move those slices around. In the case of a storage hypervisor, you can move a slice (or virtual volume) from tier to tier, from vendor to vendor, and now, from site to site all while the applications are online and accessing the data. This opens up all kinds of use cases that have been described as “cloud”. One of the coolest is inter-site application migration.
A good storage hypervisor helps you be smart.
Application owners come to you for storage capacity because you’re responsible for the storage at your company. In the old days, if they requested 500GB of capacity, you allocated 500GB off of some tier-1 physical array – and there it sat. But then you discovered storage hypervisors! Now you tell that application owner he has 500GB of capacity… What he really has is a 500GB virtual volume that is thin provisioned, compressed, and backed by lower-tier disks. When he has a few data blocks that get really hot, the storage hypervisor dynamically moves just those blocks to higher tier storage like SSD’s. His virtual disk can be accessed anywhere across vendors, tiers and even datacenters. And in the background you have changed the vendor storage he is actually sitting on twice because you found a better supplier. But he doesn’t know any of this because he only sees the 500GB virtual volume you gave him. It’s 'in the cloud'."
"Let’s start with a quick walk down memory lane. Do you remember what your data protection environment looked like before virtualization? There was a server with an operating system and an application… and that thing had a backup agent on it to capture backup copies and send them someplace (most likely over an IP network) for safe keeping. It worked, but it took a lot of time to deploy and maintain all the agents, a lot of bandwidth to transmit the data, and a lot of disk or tapes to store it all. The topic of data protection has modernized quite a bit since then.
Fast forward to today. Modernization has come from three different sources – the server hypervisor, the storage hypervisor and the unified recovery manager. The end result is a data protection environment that captures all the data it needs in one coordinated snapshot action, efficiently stores those snapshots, and provides for recovery of just about any slice of data you could want. It’s quite the beautiful thing."
At this point, you might scratch your head and ask "Does this Storage Hypervisor exist, or is this just a theoretical exercise?" The answer of course is "Yes, it does exist!" Just like VMware offers vSphere and vCenter, IBM offers block-level disk virtualization through the SAN Volume Controller(SVC) and Storwize V7000 products, with a full management support from Tivoli Storage Productivity Center Standard Edition.
SVC has supported every release of VMware since the 2.5 version. IBM is the leading reseller of VMware, so it makes sense for IBM and VMware development to collaborate and make sure all the products run smoothly together. SVC presents volumes that can be formatted for VMFS file system to hold your VMDK files, accessible via FCP protocol. IBM and VMware have some key synergies:
Management integration with Tivoli Storage Productivity Center and VMware vCenter plug-in
VAAI support: Hardware-assisted locking, hardware-assisted zeroing, and hardware-assisted copying. Some of the competitors, like EMC VPLEX, don't have this!
Space-efficient FlashCopy. Let's say you need 250 VM images, all running a particular level of Windows. A boot volume of 20GB each would consume 5000GB (5 TB) of capacity. Instead, create a Golden Master volume. Then, take 249 copies with space-efficient FlashCopy, which only consumes space for the modified portions of the new volumes. For each copy, make the necessary changes like unique hostname and IP address, changing only a few blocks of data each. The end result? 250 unique VM boot volumes in less than 25GB of space, a 200:1 reduction!
Support for VMware's Site Recovery Manager using SVC's Metro Mirror or Global Mirror features for remote-distance replication.
Data center federation. SVC allows you to seamlessly do vMotion from one datacenter to another using its "stretched cluster" capability. Basically, SVC makes a single image of the volume available to both locations, and stores two physical copies, one in each location. You can lose either datacenter and still have uninterrupted access to your data. VMware's HA or Fault Tolerance features can kick in, same as usual.
But unlike tools that work only with VMware, IBM's storage hypervisor works with a variety of server virtualization technologies, including Microsoft Hyper-V, Xen, OracleVM, Linux KVM, PowerVM, z/VM and PR/SM. This is important, as a recent poll on the Hot Aisle blog indicates that [44 percent run 2 or more server hypervisors]!
Join the conversation! The virtual dialogue on this topic will continue in a [live group chat] this Friday, September 23, 2011 from 12 noon to 1pm EDT. Join me and about 20 other top storage bloggers, key industry analysts and IBM Storage subject matter experts to discuss storage hypervisors and get questions answered about improving your private storage environment.
Continuing my coverage of the [IBM System Storage Technical University 2011], I participated in the storage free-for-all, which is a long-time tradition, started at SHARE User Group conference, and carried forward to other IT conferences. The free-for-all is a Q&A Panel of experts to allow anyone to ask any question. These are sometimes called "Birds of a Feather" (BOF). Last year, we had two: one focused on Tivoli Storage software, and the second to cover storage hardware. This year, we had two, one for System x called "Ask the eXperts", and one for System Storage called "Storage Free-for-All". This post covers the latter.
(Disclaimer: Do not shoot the messenger! We had a dozen or more experts on the panel, representing System Storage hardware, Tivoli Storage software, and Storage services. I took notes, trying to capture the essence of the questions, and the answers given by the various IBM experts. I have spelled out acronyms and provided links to relevant materials. The answers from individual IBMers may not reflect the official position of IBM management. Where appropriate, my own commentary will be in italics.)
You are in the wrong session! Go to "Ask the eXperts" session next door!
The TSM GUI sucks! Are there any plans to improve it?
Yes, we are aware that products like IBM XIV have raised the bar for what people expect from graphical user interfaces. We have plans to improve the TSM GUI. IBM's new GUI for the SAN Volume Controller and Storwize V7000 has been well-received, and will be used as a template for the GUIs of other storage hardware and software products. The GUI uses the latest HTML5, Dojo widgets and AJAX technologies, eliminating Java dependencies on the client browser.
Can we run the TSM Admin GUI from a non-Windows host?
IBM has plans to offer this. Most likely, this will be browser-based, so that any OS with a modern browser can be used.
As hard disk drives grow larger in capacity, RAID-5 becomes less viable. What is IBM doing to address this?
IBM is aware of this problem. IBM offers RAID-DP on the IBM N series, RAID-X on the IBM XIV, and RAID-6 on its other disk systems.
TPC licensing is outrageous! What is IBM going to do about it?
About 25 percent of DS8000 disk systems have SSD installed. Now that IBM DS8000 Easy Tier supports "any two" tiers, roughly 50 percent of DS8000 now have Easy Tier activated. No idea on how Easy Tier has been adopted on SVC or Storwize V7000.
We have an 8-node SVC cluster, should we put 8 SSD drives into a single node-pair, or spread them out?
We recommend putting a separate Solid-State Drive in each SVC node, with RAID-1 between nodes of a node-pair. By separating the SSD across I/O groups, you can reduce node-to-node traffic.
How well has SVC 6.2 been adopted?
The inventory call-home data is not yet available. The only SVC hardware model that does not support this level of software was the 2145-4F2 introduced in 2003. Every other model since then can be updated to this level.
Will IBM offer 600GB FDE drives for the IBM DS8700?
Currently, IBM offers 300GB and 450GB 15K RPM drives with the Full-Disk Encryption (FDE) capability for the DS8700, and 450GB and 600GB 10K RPM drives with FDE for the IBM DS8800. IBM is working with its disk suppliers to offer FDE on other disk capacities, and on SSD and NL-SAS drives as well, so that all can be used with IBM Easy Tier.
Is there a reason for the feature lag between the Easy Tier capabilities of the DS8000, and that of the SVC/Storwize V7000?
We have one team for Easy Tier, so they implement it first on DS8000, then port it over to SVC/Storwize V7000.
Does it even make sense to have separate storage tiers, especially when you factor in the cost of SVC and TPC to make it manageable?
It depends! We understand this is a trade-off between cost and complexity. Most data centers have three or more storage tiers already, so products like SVC can help simplify interoperability.
Are there best practices for combining SVC with DS8000? Can we share one DS8000 system across two or more SVC clusters?
Yes, you can share one DS8000 across multiple SVC clusters. DS8000 has auto-restripe, so consider having two big extent pools. The queue depth is 3 to 60, so aim to have up to 60 managed disks on your DS8000 assigned to SVC. The more managed disks the better.
The IBM System Storage Interopability Center (SSIC) site does not seem to be designed well for SAN Volume Controller.
Yes, we are aware of that. It was designed based on traditional Hardware Compatability Lists (HCL), but storage virtualization presents unique challenges.
How does the 24-hour learning period work for IBM Easy Tier? We have batch processing that runs from 2am to 8am on Sundays.
You can have Easy Tier monitor across this batch job window, and turn Easy Tier management between tiers on and off as needed.
Now that NetApp has acquired LSI, is the DS3000 still viable?
Yes, IBM has a strong OEM relationship with both NetApp and LSI, and this continues after the acquisition.
If have managed disks from a DS8000 multi-rank extent pool assigned to multiple SVC clusters, won't this affect performance?
Yes, possibly. Keep managed disks on seperate extent pools if this is a big concern. A PERL script is available to re-balance SVC striped volumes as needed after these changes.
Is the IBM [TPC Reporter] a replacement for IBM Tivoli Storage Productivity Center?
No, it is software, available at no additional charge, that provides additional reporting to those who have already licensed Tivoli Storage Productivity Center 4.1 and above. It will be updated as needed when new versions of Productivity Center are released.
We are experiencing lots of stability issues with SDD, SDD-PCM and SDD-DSM multipathing drivers. Are these getting the development attention they deserve?
IBM's direction is to shift toward native OS-based multipathing drivers.
Is anyone actually thinking of deploying public cloud storage in the near-term?
A few hands in the audience were raised.
None of the IBM storage devices seem to have [REST API]. Cloud storage providers are demanding this. What are IBM plans?
IBM plans to offer REST on SONAS. IBM uses SONAS internally for its own cloud storage offerings.
If you ask a DB2 specialist, an AIX specialist, and a System Storage specialist, on how to configure System p and System Storage for optimal performance, you get three different answers. Are there any IBMers who are cross-functional that can help?
Yes, for example, Earl Jew is an IBM Field Technical Support Specialist (FTSS) for both System p and Storage, and can help you with that.
Both Oracle and Microsoft recommend RAID-10 for their applications.
Don't listen to them. Feel free to use RAID-5, RAID-6 or RAID-X instead.
Resizing SVC source volumes forces ongoing FlashCopy or Metro Mirror relatiohships to be stopped. Does IBM plan to address this?
Currently, you have to stop, resize both source and target, then start the relationship again. Consider getting IBM Tivoli Storage Productivity Center for Replication (TPC-R).
IBM continues to support this for exising clients. For new deployments, IBM offers SONAS and the Information Archive (IA).
When will I be able to move SVC volumes between I/O groups?
You can today, but it is disruptive to the operating system. IBM is investigating making this less disruptive.
Will XIV ever support the mainframe?
It does already, with support for both Linux and z/VM today. For VSE support, use SVC with XIV. For those with the new zBX extension, XIV storage can be used with all of the POWER and x86-based operating systems supported. IBM has no plans to offer direct FICON attachment for z/OS or z/TPF.
Not a question - Kudos to the TSM and ProtecTIER team in supporting native IP-based replication!
When will IBM offer POWER-based models of the XIV, SVC and other storage devices?
IBM's decision to use industry-standard x86 technology has proven quite successful. However, IBM re-looks at this decision every so many years. Once again, the last iteration determined that it was not worth doing. A POWER-based model might not beat the price/performance of current x86 models, and maintaining two separate code bases would hinder development of new innovations.
We have both System i and System z, what is IBM doing to address the fact that PowerHA and GDPS are different?
IBM TPC-R has a service offering extension to support "IBM i" environments. GDPS plans to support multi-platform environments as well.
This was a great interactive session. I am glad everyone stayed late Thursday evening to participate in this discussion.