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My experience with LSI's Cachecade is that it is strictly write-through (read-only cache, as opposed to read/write). I appreciate your response, but I am really seeking this info regarding the L2 (SSD) cache provided by StarWind VirtualSAN.epalombizio wrote:Samsung 840s here.. No problems whatsoever.
I use LSI's Cachecade, so I have no input regarding Starwind's L2 cache.
Best of luck!
Makes sense. Thanks for sharing. FYI my only experience w/ Cachecade has been on Dell PowerEdge servers (PERC as a rebranded LSI). On those Dell doesn't allow write-back.epalombizio wrote:L2 cache in Starwind is defined on a per-LUN basis. It's my understanding that they're researching the ability to have an L2 cache that all devices can share.. Not a deal breaker for most people, but I don't have a lot of space on my SSDs to carve out for L2 cache for individual devices. I'm waiting until I have the ability to share the cache so I can evaluate it against Cachecade.
Cachecade can be used in Write-back mode as well as Write-Through. I haven't performed extensive testing to ensure that Write-back mode is working as I would expect..
I'm building out a new converged cluster in a week or so, so I'll have the equipment to test with before moving it into Production.
Best of luck!