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[Networker] /nsr location and performance.
2009-07-22 05:09:22
Hello all,
Recently I made a change to my setup which solved me a couple of
problems and I thought some of you might find this information useful.
My Networker server is a Sun T1000 with an internal 160Gb SATA disk.
The server is connected to an EMC AX150 which is used for AFTD.
Obviously, the AX150 does heavy I/O during backups and staging (over
50Mb/s). In the previous setup, /nsr was a ZFS filesystem on the AX150
(actually a link). In the new setup /nsr was moved to the internal SATA
disk. Due to disk space limit on the internal disk, the indexes
(/nsr/index) are still on the AX150. This change solved several problems
we had, such as RPC timeouts during backups, non-responsive nsrd
(nsrwatch not updating for minutes), slow mminfo and very slow bootstrap
backup.
It seems that although one might be tempted to place /nsr on a large
RAID array, it is important that it will have good performance which
your typical AFTD array will probably be unable to deliver while busy.
On a side note, while writing this, I went to the useless Performance
Tuning Guide to see if the best location for /nsr was mentioned (and
just to see if things have improved since I last went over it), but
couldn't find any discussion about it. I did find some improvements,
such as the statement: "For example, there is no system which can fully
sustain 8 by LTO3 (considered normal practice in many environments).").
It is still a bad guide which still considers FDDI as a network upgrade
(on page 32). This looks even worse, because on page 31 they discuss
contemporary hardware such as "a mid-size system with 4 by 1-Gbit,
NICs". As always, it seems that nobody didn't bother to read it end to
end. I am quite sure that if any EMC engineer will spend just two hours
to proof read it, many of its problems can be eliminated. In its current
state, this guide simply demonstrates EMC's disrespect to their loyal
paying customers.
--
-- Yaron.
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