Hi

There is a known bug in Solaris which only arise only under special
circumstances with using several sessions. We had a similar problem this
year on a very large site when only 1 client was running we got very good
speed of 30MB/s but when we increased the number of sessions the speed
instantly dropped to around 4MB/s. There is a patch in the works, it's easy
to verify though.

Does the server in question have the necessary HW to push data usually GB
interfaces eat 1 processor, but it shouldn't justify 100KB/s :-)

Uppgrading the NetWorker client though and to the latest kernel, that's
where I'd start.

Regards
Michael Persson

-----Original Message-----
From: David De Maeyer [mailto:ddm AT RUC DOT DK]
Sent: den 29 april 2004 14:26
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] backup mail server very slow (linux)


RAID is one big partition and parallelism is on 4 for the client. I thought
increasing the parallelism on the client.

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 14:19, agascoyn wrote:

> Hi David
>
> How is your raid setup.
>
> Is it one big partition or groups of smaller partitions.
>
> Also what is your parellalism set to currently.
>
> Andrew Gascoyne
>
> Data Backup / Recovery Administrator
>
> David De Maeyer wrote:
>
>> 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
>>
>> --
>> Note: To sign off this list, send a "signoff networker" command via
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>
> --
> Andrew Gascoyne
> Unix Administrator
> European Southern Observatory
> Karl-Schwarzschild-Strasse 2
> D-85748 Garching bei Muenchen
>
> Phone: +49 89 32006443
> Fax  : +49 89 32006380
> EMail: agascoyn AT eso DOT org
>

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