On 12/1/2011 3:15 PM, David Brodbeck wrote:
On Thu, Dec 1, 2011 at 8:09 AM, Geoff Flarity<[email protected]>wrote:
My advice would be to max out your RAM (for ARC) before you bother
with a ZIL, or L2ARC. Where a fast SSD for a ZIL really shines is
random synchronized writes. IE a database transaction. You'll notice
this when you run filebench and look at the results. I'm not sure how
NFS handles FSYNC and DSYNC to be honest.
NFS does a *lot* of synchronous writes and will probably benefit from a
fast ZIL device.
It's particularly valuable data for heavy meta-data intensive things
with NFS, which includes deleting directories with rm -r and creating or
updating lots of small files. NFS commits beat on the ZIL.
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