Chuck Hollis makes some excellent points about Green Data Center Goes Marketing Mainstream
. He does a great job summarizing EMC's strategy in this area:
- Use VMware to virtualize your x86-based servers
- Use more efficient disk media, such as high-capacity SATA disk drives
Both are great recommendations, but why limit yourself to what EMC offers? Your x86-based machines are only a subset of your servers,and disk is only a subset of your storage. IBM takes a more holistic approach, looking at the entire data center.
- VMware is a great product, and IBM is its top reseller. But in addition to VMware, there are other solutions for the x86-based servers, like Xen and Microsoft Virtual Server. IBM's System p, System i, and System z product lines all support logical partitioning.
To compare the energy effectiveness of server virtualization, consider a metric that can apply across platforms. For example, for an e-mail server, consider watts per mailbox. If you have, say, 15,000 users, you can calculate how many watts you are consuming to manage their mailboxes on your current environment, and compare that with running them on VMware, or logical partitions on other servers. Some people find it surprising that it is often more cost-effective, and power-efficient, to run workloads on mainframe logical partitions (LPARs) than a stack of x86 servers running VMware.
- More efficient Media
- SATA and FATA disks support higher capacities, and run at slower RPM speeds, thus using fewer watts per terabyte.A terabyte stored on 73GB high-speed 15K RPM drives consumes more watts than the same terabyte stored using 500GB SATA.Chuck correctly identifies that tape is more power-efficient than disk, but then argues that paper is more power-efficient than tape. But paper is not necessarily more efficient than tape.
ESG analyst Steve Duplessie divides up data betweenDynamic vs. Persistent. The best place to put dynamic data is on disk, and here is where evaluation of FC/SAS versus SATA/FATA comes into play.Persistent data, on the other hand, can be stored on paper, microfiche, optical or tape media. All of these shelf-resident media consume no electricity, nor generate any heat that would require additional cooling.
A study by scientists at the Lawrence Berkeley National Laboratory titled High-Tech Means High-Efficiency: The Business Case for Energy Management in High-Tech Industries indicates thatData centers consume 15 to 100 times more energy per square foot than traditional office space. Storing persistent data in traditional office space can save a huge amount of energy. Steve Duplessie feels the ratio of dynamic to persistent data is 1:10 today, but is likely to grow to 1:100 in the near future, raising the demand for energy-efficient storage of persistent data ever more important to our environment.
Data centers consume nearly 5000 Megawatts in the USA alone, 14000 Megawatts worldwide. To put that in perspective, the country of Hungary I was in last week can generate up to 8000 Megawatts for the entire country (and they were using 7400 Megawatts last week as a result of their current heat wave, causing them grave concern).
Back in the 1990's, one of the insurance companies IBM worked with kept data on paper in manila folders, and armiesof young adults in roller skates were dispatched throughout the large warehouses of shelves to get the appropriate folder in response to customer service inquiries. Digitizing this paper into electronic format greatly reduced the need for this amount of warehouse space, as well as improved the time to retrieve the data.
A typical file storage box (12 inch x 12 inch x 18 inch) containing typed pages single-spaced, double-sided, 12 point font could hold perhaps 100MB. The same box could hold a hundred or more LTO or 3592 tape cartridges, each storing hundreds of GB of information. That's a million-to-one improvement of space-efficiency, and from a watts-per-TB basis, translates to substantial improvement in standard office air conditioning and lighting conditions.
To learn more about IBM's Project Big Green, watch thisintroductory video
which used Second Life for the animation.
technorati tags: IBM, EMC, Chuck Hollis, VMware, FC, SAS, SATA, FATA, disk, storage, logical partition, energy, power, cooling, Steve Duplessie, dynamic, persistent, data, Lawrence Berkeley National Laboratory, megawatt, paper, optical, microfiche, LTO, 3592, Project Big Green, Secondlife
I'm in the Malev lounge at the Budapest Airport, waiting for my flight to return back to Tucson.
My buddy Marc Farley from EqualLogic points to a great InfoStorarticle by Ann Silverthorn titled The benefits of SANs for SMBs.
Back in the late 1980's and early 1990's, I was one of the architects for DFSMS on z/OS, and customers always asked, "What is the clip level?", in other words, how big does a customer have to be to take advantage of DFSMS. We worked it out that if you had more than 100GB of disk data, DFSMS is worthwhile. DFSMS is now just standard by default, as everyone now easily has more than 100GB of data.
Later, in the late 1990's, I worked on Linux for System z. Again, customers asked how many Linux guest images would justify deploying applications on a mainframe. We worked it out to about 10 images. 10 Linux logical partitions, or Linux guests under z/VM was enough to cost justify the entire investment.
So what is the "clip level" for SANs? How many servers does an SMB need to have to justify deploying a SAN? IBM announced the new BladeCenter S designed specifically for mid-sized companies, 100 to 1000 employees, typically running 25 to 45 servers. However, I suspect companies as small as 7-10 servers would probably benefit from deploying an FC or IP SAN.
What do you think? Send me a comment on how many servers should be the clip level.
technorati tags: IBM, Marc Farley, EqualLogic, Ann Silverthorn, SMB, SAN, IP, iSCSI, FC, Linux, DFSMS, z/OS, BladeCenter, Budapest
A client complained that their tape drives were not compressing data as well as it used to. Investigating further reminded me of a scene from the 1970's television show "All in the family"
, summarized well inAmerican Scientist
... in one episode of All in the Family, Archie Bunker's son-in-law, Mike, watches Archie put on his shoes and socks. Mike goes into a conniption when Archie puts the sock and shoe completely on one foot first, tying a bow to complete the action, while the other foot remains bare. To Mike, if I remember correctly, the right way to put on shoes and socks is first to put a sock on each foot and only then put the shoes on over them, and only in the same order as the socks. In an ironic development in his character, the politically liberal Mike shows himself to be intolerant of differences in how people do common little things, unaccepting of the fact that there is more than one way to skin a cat or put on one's shoes.
Both agreed that socks go first, then shoes, but the actual deployment was different.
In the case of this customer, a recent change was the use of "encryption" before the data reached the tape drive. In regards to compression and encryption, you should always compress first, then encrypt. Compression algorithms rely on frequency of data, for example the letter "E" appears more often in the English language than the letter "Z". However, once you encrypt data, those data patterns are randomized, and any attempt to compress the data afterwards is wasted effort.
With IBM tape encryption on either the TS1120 or LTO4 tape drives, we compress, then encrypt, the data when it arrives to the tape drive, so that the compression has some chance of getting up to 3:1 reduction. This compress-then-encrypt process can be done at the host as well, either from the application software or feature of the operating system.
So, just as the case between Archie Bunker and his son-in-law, there are many ways to deploy compression and encryption, just make sure you do them in the right order to get the most benefit.
technorati tags: IBM, tape, storage, encryption, TS1120, LTO4, Archie Bunker, meathead, socks, shoes
This week I am off to Budapest, Hungary, for business meetings. It is the closest major city to IBM'smanufacturing plant in a small town called Vac (rhymes with "knots") where the IBM System Storage DS8000 seriesand SAN Volume Controller are assembled.
technorati tags: IBM, Vac, Hungary, DS8000, SVC, disk, storage, manufacturing, plant
Last week, I opined that Monday's IDC announcement "IBM #1 in combined disk and tape storage hardwaresales for 2006" was in part because of a resurgence of interest in tape
, with four specific examples. There was a lot of reaction and reflection fromboth sides.
- On the one side...
EMC blogger Mark Twomey at Storagezilla admits that perhapsTape Isn't Dead after all,is perhaps the best place to put long-term archive data, but not for backup? EMC's "creative marketing types" put out this Fun With Tape video that I found amusing. (It asks for a first name,last name, and e-mail address, which are then embedded into the resulting video itself, and perhaps forwarded to your nearest EMC sales rep, so answer according to your wishes for privacy).
The "mummy wrapped in tape media" seems to be a common theme, and shows up again in LiveVault'svideo with John Cleese, which makes the same argument asthe EMC video above, namely: switch your backups from tape to disk because we are a disk-only vendor.
- ... and on the other side
JWT over at DrunkenData asks Which is greener, disk or tape?Tape is, of course, by a long shot, and an essential part of IBM's Big Green initiative, a project to invest$1US Billion dollars per year for data centers to be more efficient for power and cooling.
Sun/StorageTek blogger Randy Chalfant questions the Death of Tape, and argues thatdisk-only solutions suffer from atrophy.The results he posts from a survey of 200 customers are similar to those we've seen with customers using IBM TotalStorage Productivity Center, our software to help evaluate data usage, and identify misuse, in your data center.
To my readers in the USA, United Kingdom, Ireland, South Africa, China and Japan, and a few other countries, Happy Father's Day!
technorati tags: IBM, IDC, combined, disk, tape, storage, announcement, EMC, dead, LiveVault, video, John Cleese, JWT, DrunkenData, Sun, StorageTek, STK, Randy Chalfant, TotalStorage, Productivity Center, Fathers Day, Big, Green, initiative