On Tue, May 4, 2010 at 12:16 PM, Michael Sullivan < michael.p.sulli...@mac.com> wrote:
> I have a question I cannot seem to find an answer to. > > I know I can set up a stripe of L2ARC SSD's with say, 4 SSD's. > > I know if I set up ZIL on SSD and the SSD goes bad, the the ZIL will be > relocated back to the spool. I'd probably have it mirrored anyway, just in > case. However you cannot mirror the L2ARC, so... > > What I want to know, is what happens if one of those SSD's goes bad? What > happens to the L2ARC? Is it just taken offline, or will it continue to > perform even with one drive missing? > > Sorry, if these questions have been asked before, but I cannot seem to find > an answer. > Data in the L2ARC is checksummed. If a checksum fails, or the device disappears, data is read from the pool. The L2ARC is essentially a throw-away cache for reads. If it's there, reads can be faster as data is not pulled from disk. If it's not there, data just gets pulled from disk as per normal. There's nothing really special about the L2ARC devices. -- Freddie Cash fjwc...@gmail.com
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