Maarten Boot (CWEU-USERS/CWNL) wrote:

Slow backups can also be caused by lots of very small files,

We have one accound used for compiling our product. It has hundereds of
thousanda of small c files and their objects files. Without any precaution my
backups dropped to kilobytes per second on that account only.

   Same here.

how is your data ?

Maarten


On Thursday 29 April 2004 14:43, you wrote:

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

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