Networker

Re: [Networker] Cloning performance

2004-10-19 11:51:06
Subject: Re: [Networker] Cloning performance
From: Ulrich Bernhard <ulrich.bernhard AT ID.UNIZH DOT CH>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Tue, 19 Oct 2004 17:50:10 +0200
Darren,
thanks for your hint.

- We never have made a restore at least not in the time where I have to
be responsible for these systems....

- Yes we are using parallelisme for the backup. The values are 8 for
every client and 24 as server setting.

- I have no idea how the cloning is working. But in the sessions window
I see messages like:
cloning session: 2 of 26 save set(s) reading from ......
zuvrobot:cloning session saving to pool ....

So I think we are cloning one saveset at a time.

Sorry, but I am new to the Legato Networker. Is it possible to clone
also in a parallele mode like the backup?

Thanks

Ulrich

Darren Dunham wrote:
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
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 | Ulrich Bernhard                                           |
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 | Universitaet Zuerich   Fax: (+41-44) 635 45 05            |
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 | CH-8057 Zuerich        Email: ulrich.bernhard AT id.unizh DOT ch |
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