Barry Whyte is a 'Master Inventor' working in the Systems & Technology Group based in IBM Hursley, UK. Barry primarly works on the IBM SAN Volume Controller and Storwize family of virtual disk systems. Barry graduated from The University of Glasgow in 1996 with a B.Sc (Hons) in Computing Science. In his 18 years at IBM he has also worked on the successful Serial Storage Architecture (SSA) and the IBM DS8000 range. Barry joined the SVC development team soon after its inception and has held many positions before taking on his current role as performance architect. Outside of work, Barry enjoys playing golf and all things to do with Rotary Engines. All posts on this blog are (c) Copyright International Business Machines 2014 - reproduction without prior approval is prohibited.
There is a big difference to "in the switch" network based storage virtualization and "appliance" network based storage virtualization. Hu Yoshida and Dr. Kevin McIsaac, seems to have forgotten that in my comparison series of the three approaches to storage virtualization, both the appliance and... [Continue Reading]
Last week was a long one. The main SVC test-lab in Hursley suffers from the same problems that haunts most machine rooms - lack of power and not enough cooling. Thats not to say that we don't have a lot of both, just that as the support and test requirements have increased over the last five years,... [Continue Reading]
With the GA of IBM SAN Volume Controller (SVC) v4.2.1 only a couple of weeks away, its been the usual last minute rush to get the last few code changes benchmarked on my performance stand. Luckily the set of scripts and tools I inherited, and have modified over the years, allow 24x7 benchmarking,... [Continue Reading]
I promised a bit more detail on the very limited sample set used by EMC's latest blogger Dr Kartik , in response to his analysis that SPC-1 IOPs is directly proportional to the number of drives used by the system under test. So I cannot deny the fact that : larger number of drives = larger IOPs... [Continue Reading]
IBM today announced the next release of SVC - version 4.2.1 - which will be generally available as of November 16th. The key highlights of this release are : Copy Services Enhancements - including Incremental FlashCopy, Cascaded FlashCopy, configurable copy services space Aid business continuity by... [Continue Reading]
Over at The SAN Technologist Steven is making some wild and mostly inaccurate statements, particularly about SVC, as well as some curious associations between startup company failures and storage virtualization. He asks : So why has storage virtualization failed? I wasn't aware it had, and with SVC... [Continue Reading]
With the kids having next week off, its time for the trek back up the M6 to Scotland to take them to see their grandparents. After a few manic weeks at work with calls at both ends of the day, I'm off for some well needed rest back in Glasgow. I will reply to any comments when I return.
The SPC contacted SUN regarding violations of the SPC 'fair-use' terms. To that end, John and Valdis have retracted both the newsletter comments and blog posts that claimed 'faster than SVC' therefore the links in this post no longer show their original content. I have left this post in place for... [Continue Reading]
I've been meaning to post this entry in my Storage Virtualization part work for some time now. Day to day work, testing some new functions and customer commitments have left little, if any, time to dump my thoughts. This weekend has proved to be a good respite, and allowed me not only time to catch... [Continue Reading]
This morning one of my colleagues in my office bay started a discussion about the fine line between divulging useful technical information on this blog-o-sphere while maintaining the confidentiality of technical information, product plans and general intellectual property of IBM. I explained to him... [Continue Reading]
There has been much said about the VMware certification process, why isn't SVC fully supported etc; particularly in comments on my blog. Today IBM and VMware jointly announced full certification of SVC 4.2.0 with VMWare ESX 3.0.2. Read the full press release here . As I had previously commented, we... [Continue Reading]
I'd like to at least take my hat off to HDS for once. I have been laying into them with apparently car salesman like maths , but then it had to be said. So why this sudden note of appreciation. For stepping up to the mark and submitting their USP-V to the Storage Performance Council , SPC-1... [Continue Reading]
I've been following the Solid State Disk (SSD) evolution over the last year or two with a selfish eye. Running one of the largest test stands we have in the Hursley SVC lab (from a number of spindles point of view) I too suffer the pain of drive fall-out. Its more of just an annoyance to me though,... [Continue Reading]
Following on from Chris' comments in "Pause for Thoughtput" I had a look around and there are some interesting posts being made. Being one of those close to the "Virtualmania" scene I had a look through the second paper Gear6 have written, "Provisioning for Predictable Performance" . Jumping to the... [Continue Reading]
I must admit that one of the things I have looked forward to this year has been the Saturday qualifying and Sunday race days in the Formula 1 calendar. It's been a great F1 season so far, not just because I'm a Brit (well Scotsman abroad - Coulhtard was always British when he won... ) Nobody, least... [Continue Reading]