Networker

Re: [Networker] will staging process slow-down backup to disk?

2007-04-12 10:50:37
Subject: Re: [Networker] will staging process slow-down backup to disk?
From: Yaron Zabary <yaron AT ARISTO.TAU.AC DOT IL>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Thu, 12 Apr 2007 17:44:49 +0300
mark wragge wrote:
Should backup to disk slow down when staging process is moving data from disk 
to tape?
We have Windows clients and networker server 7.3.2 using disk backup. When the staging process was running the cloning speed was 10mb/s and 2 client backups started (2 streams). The backup speed reduced to about 1mb/s. When staging is not taking place the backup speed is greater than 10mb/s depending on number of streams. Is this expected or do i need to investigate my configuration further.

I am having similar problems. The only solution, so far, is to make sure staging is done during the day, when there are no backups. I am using the following script (Perl on Solaris) from cron to change the high and low water marks at 14:30, to make sure the next night backups will have enough space, so that the running backups will not trigger the staging. The staging policy really needs some improvement.

#!/bin/perl

open(OUT,">/tmp/nsradmin.in.fixstage");
print OUT ". name: $ARGV[0] ; \n\n";

print OUT "\nupdate high water mark (%): $ARGV[2] ; \n";
print OUT "low water mark (%): $ARGV[1] ; \n";

print OUT ("\nquit\n");
close(OUT);

system ("nsradmin -i /tmp/nsradmin.in.fixstage");

sleep 5;



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--

-- Yaron.

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