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May 11, 2010

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nate

what size blocks does sub lun FAST operate in? Myself I'm not yet convinced automagic storage tiering can properly exploit the advantages of SSD. The recent SPC-1 numbers (more specifically the cost numbers) posted by IBM with their easy tier(1GB blocks) reinforces that stance.

the fast cache stuff certainly looks interesting, it's a concept I have been hounding on for a long time now. The key being that the SSDs are used for writes as well as reads. There's more than a couple SSD acceleration systems out there now but this Fast cache is the first one I've heard of that does writes.

Chuck Hollis

Hi Nate -- all good. The best blog for this discussion (plus impact on production workloads) would be Chad's blog over at virtualgeek.typepad.com.

The auto-tiering done by FAST, along with the FAST cache, work well together IMHO. The penalty associated with over-aggressive down-tiering appears to be well mitigated by modest amounts of FAST cache. And, as you noticed, the scheme works well for both reads *and* writes.

Add in compression for primary volumes, and it's a pretty good package IMHO.

-- Chuck

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Chuck Hollis


  • Chuck Hollis
    Chief Strategist, VMware Storage and Availability Business Unit
    @chuckhollis

    Chuck works for VMware, and is deeply embroiled in all things software-defined storage these days.

    Previously, he was with EMC for 18 years, most of them great.

    He enjoys speaking to customer and industry audiences about a variety of technology topics, and -- of course -- enjoys blogging.

    Chuck lives in Holliston, MA with his wife, three kids and four dogs when he's not traveling. In his spare time, Chuck is working on his second career as an aging rock musician.

    Warning: do not buy him a drink when there is a piano nearby.
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