Networker

Re: [Networker] Does cloning unmuliplex and make recovery faster?

2007-01-17 15:38:40
Subject: Re: [Networker] Does cloning unmuliplex and make recovery faster?
From: Dag Nygren <dag AT NEWTECH DOT FI>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Wed, 17 Jan 2007 22:28:58 +0200
> Cloning de-multiplexes the data so the clone should always restore
> faster than the original (assuming you use target sessions higher than
> 1).

You have to remember one thing here though:
The write capability of the client you are recovering to.

This will typically be slightly lower than the read speed
with inode updates and such.

And if you can avoid shoeshining the drive during recover
with the "right" parallelism you will actually get a recover speed
from a multiplexed volume that are faster than from a non-multiplexed
one. The difference will not be large, but indeed noticable.

This implies that if your recovers are faster from a non muxed tape
you were using  a too high parallelism setting during the backup.

Best
Dag

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