Re: [Networker] Backup speed drop with 7.3.3 (nsmmd problem?)
2007-09-02 08:56:46
FYI, I backed out to 7.3.2 Jumbo (Build 11) (I don't have the later
build available, and its no longer available for download).
It seemed to resolve the problem of backing up this host, but when
another group ran that was backing up several local/NFS filesystems,
performance dropped again, generally around 350KB/s, and nsrmmd using
99% CPU again. These filesystems backed up fine previously under 7.3.3.
Is there an adv_file limitation I'm not aware of that affect
performance? Should I reduce the max targets?
I have about 10 Netapp filesystems I will be backing up via NFS, which
it is intended will happen on the Networker server. Should I be backing
them up via other hosts instead?
Brian O'Neill wrote:
[Argh...I spent gathering info and typing this message, and I think I
see the issue...more info at the bottom]
This is a new setup, and I'm at a loss as to what's happening -
wondering if someone else has seen something similar.
Server is a Dell 1850 running Red Hat ES4 (32-bit) and Networker 7.3.3
with a PERC-connected RAID 5 array for adv_file storage.
Backup client is an older Dell 1750 running Red Hat ES4 (32-bit) with an
Adaptec ASR-2130S-connected RAID 5 set with a filesystem containing
400GB of Oracle dump files. Only the dumps are being backed up. Client
is 7.3.3.
Connection is via a private backup network, with a single gbit switch in
between. Both hosts have their adapters at 1000/full, and are not
showing any errors (I don't have insight to the switch yet - it's
managed by the people I'm setting up the backup for, and its the long
weekend).
Things start off at a steady rate of 35MB/s, with perhaps peaks in the
40MB/s range. Reasonable enough.
But at someone point - roughly an hour or about 140-150GB in to the
backup, speeds suddenly drop to a VERY steady 146 +- 2KB/s. And with
250GB to go, VERY unacceptable.
Any thoughts as to what might be the cause of this degradation?
New: Now I'm noticing that on the backup server that one of the nsrmmd
processes is eating up CPU...is this the problem on 7.3.3 that I've been
hearing about? Is the only solution to downgrade to 7.3.2?
-Brian
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