Networker

Re: [Networker] backup mail server very slow (linux)

2004-04-29 08:23:25
Subject: Re: [Networker] backup mail server very slow (linux)
From: David De Maeyer <ddm AT RUC DOT DK>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Thu, 29 Apr 2004 14:24:01 +0200
As a matter of fact, Debian is not supported but we never had any
problem with it (except when - mentioned earlier in a previous mail -
we upgrade X). All the other boxes are just doing fine.

User directories are stored on the same mount point - the associated
device is a RAID.

Client runs fine, we have no problem with the IMAP server... and the
server uses a GB interface properly configured.

We have tried using another filesystem ReiserFS instead of EXT3 but it
didn't improve the average performance.
David



___________________________________________________
David De Maeyer
Roskilde University Center, Department of Computer Science
Box 260, Hus 42.1, 4000 Roskilde, Denmark
voice (+45) 46 74 38 29 / fax (+45) 46 74 30 72




On 29 Apr 2004, at 13:53, Michael Persson wrote:

Hi

I would start with uppgrading the client to 7.1.1 and verify that it
actually runs 100Mbit/FD there are some tools like mii-tools in Linux
which
allows you to specify speed/duplex instead of using AutoSensing which
is a
bad idea. You should also verify the switch port that it runs
100Mbit/FD.

Debian is NOT a supported distribution, althought it work's.

Regards
Michael Persson

-----Original Message-----
From: David De Maeyer [mailto:ddm AT RUC DOT DK]
Sent: den 29 april 2004 13:40
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] backup mail server very slow (linux)


Hi all!

We are facing a performance issue when taking a full backup of our mail
server (>7000 users, 350 GB of data, running Debian linux).

The backup server has no problem with the other linux clients. It is
writing
at around 100 KB/s... which is far from the 2 to 8 MB/s we are used to
have
on the other clients.

It takes forever to backup all the user directories! And we simply
can't
find where the bottleneck is... just that there are a lot of I/O on
the RAID
on which these directories are stored.

Would it help to increase/decrease the parallelism for the client
and/or
other clients (smaller filesystems)?

Does somebody on this mailing-list once faced a similar problem? Is the
upgrade of the client on the mail server a must?

Regards,
David

server: NetWorker 7.1.1 (running Solaris 8)
client: NetWorker 6.1.1 (running Debian linux, IMAP server, 350 GB on
external RAID)

___________________________________________________
David De Maeyer
Roskilde University Center, Department of Computer Science
Box 260, Hus 42.1, 4000 Roskilde, Denmark
voice (+45) 46 74 38 29 / fax (+45) 46 74 30 72

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