Networker

Re: [Networker] Cloning performance

2004-10-19 10:43:33
Subject: Re: [Networker] Cloning performance
From: Darren Dunham <ddunham AT TAOS DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Tue, 19 Oct 2004 08:00:22 -0700
>
> We run Legato Networker 6.1.4 on a tru64 5.1 platform with a ESL9198 tape
> library with 6 dlt8000 tape drives.
> We make every week one full backup of all connected systems (7 tru64 5.1b
> server). This backup is defined with 'clones = yes'.
> The backup needs about 12 hours but the clone needs more than 48 hours.
>
> The write speed for the clone sessions is mostly below 1MB per second.
>
> What can we do to increase this write performance for the cloning?

My guess is that it's the read performance and not the write
performance.  Do you test restores periodically?  Do you get good
performance on them?

Are you using muliplexing on the the backup?  If so, how are you doing
the cloning?  If you clone one saveset at a time, you're going to end up
demultiplexing the savesets.  This will increase the speed of restores
from the clones, but it'll take a lot of time to do.  You might be able
to increase the overall time (at a backup penalty) by reducing the
multiplexing if you're doing it.

Some places are starting to go with disk staging arenas for items like
this.

If you're not doing multiplexing, then you'll need to do some
investigation and describe your cloning process in more detail.


--
Darren Dunham                                           ddunham AT taos DOT com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
         < This line left intentionally blank to confuse you. >

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