Thanks for the stats, I'll be de-duping VMWare data soon too.
My NetApp storage tech says that read cache peformance will increase since you're reducing the total number of actual blocks. I have not heard of any performance degradations with A-SIS, other than filer overhead (CPU) when SIS is actually de-duplicating. My A-SIS schedules are during off-peak hours so it's not a concern of mine.
Daniel
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From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Glenn Walker Sent: Wednesday, February 13, 2008 9:42 AM To: Bill Holland; toasters@mathworks.com Subject: RE: De-dup'ing Primary Storage
We've been doing some VMWare testing with FCP LUNs and A-SIS.
We saw a reduction from 471GB to 21GB with only about a 7% reduction in performance. More than a fair trade-off in my opinion.
Our testing could have had impact on the performance more than the de-dupe, however.
Glenn
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From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Bill Holland Sent: Wednesday, February 13, 2008 6:50 AM To: toasters@mathworks.com Subject: De-dup'ing Primary Storage
To those of you that have implemented Nearstore and A-SIS on your primary storage:
1. Have you seen any difference in overall filer performance?
2. If you have LUNs, how are your space savings on those volumes?
I know that enabling Nearstore does some system tweaking in the background to increase the number of concurrent backup streams that can be running, but I don't know what else it tweaks that may adversely affect performance of a primary storage system. Afterall, it was originally designed to run as a secondary storage platform.
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