Condusiv Technologies Blog

Condusiv Technologies Blog

Blogging @Condusiv

The Condusiv blog shares insight into the issues surrounding system and application performance—and how I/O optimization software is breaking new ground in solving those issues.

Virtual Server Defrag Heating Up

by Helpdesk 20. April 2006 16:47
Virtual server defragmentation is getting even more attention with the media coverage of our recent partnership initiative with Microsoft. In case anybody missed it, Microsoft's recent announcement mentioned us as one of their key partners involved in pushing forward virtualization technology. See articles in Redmond Magazine, InformationWeek, and CRN. Many IT professionals are currently using Diskeeper to defragment Virtual Server 2005 and VMWare with much success, however there is still work to be done to ensure that the most thorough defragmentation job can be achieved on the host and virtual levels. These technical challenges are why Microsoft has tapped us yet again to push forward defragmentation technology on the Windows platform. Server virtualization has the effect of making the mechanical disk drive an even bigger bottleneck. As I've said before on this blog, automatic defragmentation should play a key part in your virtualization strategy. —Paul

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Yet even more on Free Space Defrag....

by Michael 11. April 2006 15:35
As I suggested in an earlier blog, we have had a handful of comments on Paul's free space blogs. Given the comments, and the relative ambiguity of this whole discussion, I feel I need to clarify Diskeeper's viewpoints on the matter a bit further. I apologize in advance if this blog seems to originate from the Department of Redundancy Redundancy. Also, I apparently have some as yet undiagnosed affliction that causes me to be exceedingly long-winded. I seem to suffer from the inability to write anything less than a novel about any subject; so a second apology for the blog length. To business... Is it possible that some comments originated from Diskeeper Corporation that said free space consolidation is not important, or did not grant it the proper value? Sure it's possible. Personally I have not seen them, but that might just be me, or I may interpret them differently. What I would argue against is the misuse of a comment: i.e. where a statement is taken out of perspective (a frequent topic of late). A case in point would be misinterpreting Microsoft saying free space defragmentation is important, to meaning that free space needs to be "all in one pool". Microsoft correctly, even if with some ambiguity, values free space consolidation and states in the apparently somewhat disputed report that "Ideally, this space would be available in a few contiguous portions of the disk." So exactly how many is "a few" - that is up for debate and personal interpretation. Yes, one could interpret this to say the best application of "a few" is equal to "one". However, Microsoft does not implicitly say "one".

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My last entry

by Helpdesk 11. April 2006 14:07
Regarding my last entry: Someone pointed out (correctly) that the article from Microsoft was not in fact new. I had picked it up on my google alerts and had some difficulty verifying the date it was written. I offer my apologies for the mistake. I also want to point out that some of the commenters on my entry are confused about free space defragmentation. All 3rd party defragmenters defragment free space. Everyone agrees that it needs to be defragmented. The only question is to what degree. Some in the industry have promoted free space "consolidation" or the putting of all the free space into one-pool as an attempt at product differentiation. We disagree with this approach of putting it into one-pool, and always have. Has Diskeeper improved over the years at free space defragmentation? Yes. Should we suddenly switch to "consolidate" free space into one-pool? No. The point of my last post was to point out that the one-pool philosophy is incorrect. Going the extra mile to put all of the free space into one-pool is a waste of resources as it only temporarily creates a pretty disk map. In the article I referenced, Microsoft also endorses a different approach when they state that free space should be in, "a few contiguous portions of the disk." I will let the Diskeeper Product Manager Michael elaborate further.

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