Ben Rockwood's written a very useful util called arc_summary:
http://www.cuddletech.com/blog/pivot/entry.php?id=979
It's really good for looking at ARC usage (including memory usage).
You might be able to make some guesses based on "kstat -n zfs_file_data"
and "kstat -n zfs_file_data_buf". Look for mem_inuse.
Running "::memstat" in "mdb -k" also shows Kernel memory usage (probably
includes ZFS overhead) and ZFS File Data memory usage. But it's
painfully slow to run. kstat is probably better.
-Paul Choi
Richard Elling wrote:
Bob Friesenhahn wrote:
On Wed, 6 May 2009, Troy Nancarrow (MEL) wrote:
Please forgive me if my searching-fu has failed me in this case, but
I've been unable to find any information on how people are going about
monitoring and alerting regarding memory usage on Solaris hosts using
ZFS.
The problem is not that the ZFS ARC is using up the memory, but that
the
script Nagios is using to check memory usage simply sees, say 96% RAM
used, and alerts.
Memory is meant to be used. 96% RAM use is good since it represents
an effective use of your investment.
Actually, I think a percentage of RAM is a bogus metric to measure.
For example, on a 2TBytes system, you would be wasting 80 GBytes.
Perhaps you should look for a more meaningful threshold.
-- richard
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