definitions for /proc/fs/xfs/stat

[Mark Seger]

> How big is the write cache in your RAID array? If the log is the
> only thing being written to, and it fits within the cache, then it
> can easily push several hundred MB/s of write IO....


I asked around and people believe the cache is on the order of a few GB and
the test ran I was intentionally large enough to overshadow any cache
effects, running for about a minute and doing 100K 1K file creates.  The
disk write data was close to a sustained 475MB/sec and would have easily
filled the cache in the first handful of seconds which would have produced
enough backpressure to slow down the write rate which it never did.

On a totally different topic, and if you like we can start a different
thread on it, I'd be interested in adding some monitoring stats to collectl
for xfs and could use some suggestions of what are the most important.

-mark
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