Networker

[Networker] Backup speed drop with 7.3.3 (nsmmd problem?)

2007-09-01 16:47:12
Subject: [Networker] Backup speed drop with 7.3.3 (nsmmd problem?)
From: "Brian O'Neill" <oneill AT OINC DOT NET>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Sat, 1 Sep 2007 16:42:36 -0400
[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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