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Re: [Networker] /nsr iops
2011-09-20 09:58:30
Actually, it is the other way. /nsr holds critical directories which
will suffer if they are to be on the same array with an AFTD. On July
2009 I sent the following to the list (this was with 7.4.4, but I think
this holds true for later versions as well):
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 09/20/11 16:41, Eugene Vilensky wrote:
Hello,
We purchased some SATA drives (24 x 2TB across two external-SAS
enclosures) to be run for an adv_file staging device, trying to feed 4
LTO5 drives. If I carve an extra LUN from one of these enclosures to
serve as /nsr, will that adversely affect the speed of staging? Any
anecdotal experience anyone has would be wonderful.
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--
-- Yaron.
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