Thanks, I like this summary format and the effort it took to produce seems well-spent.
On Thu, Jun 02, 2011 at 08:50:58PM -0400, Edward Ned Harvey wrote: > > but I figured spending 500G on ZIL > > would be unwise. > > You couldn't possibly ever use 500G of ZIL, because the ZIL is required to > be flushed to disk at least once every 5sec to 30sec (depending on which > build you're running.) Even if you have a 4G dedicated log device, that's > more than plenty for most purposes. It is also limited to at most half of physical memory, as I recall. Remember that SZIL is nonvolatile backing store for in-memory write structures that have to remain until txg close anyway. Separately, with only 4G of RAM, i think an L2ARC is likely about a wash, since L2ARC entries also consume RAM. The extra details provided just confirm that the 3-way-mirror is the best tweak for this existing system with no cost. -- Dan.
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