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)

___________________________________________________

Hi,

       Over time, when we find that some particular
server/computer is backing up very slowly, we've found that
incorrect ethernet port settings have been by far the
most common reason.  So this is certainly the first place I'd
look.  However, I disagree with the statement
that auto-sensing of ethernet speeds is a bad idea.   We've found
it over time to be highly reliable -- I am responsible for research
computing within a healthcare institution.   We have 600 Macs,
400 pcs, and use Networker to backup about 65 larger servers.
Fixing ethernet ports at the switch side requires you to set each
machine by hand.   The last bunch of computers that we found
with problems auto-sensing were some NT4 servers.

                                       Matt Temple

--
=============================================================
Matthew Temple                Tel:    617/632-2597
Director, Research Computing  Fax:    617/582-7820
Dana-Farber Cancer Institute  mht AT research.dfci.harvard DOT edu
44 Binney Street,  LG300/300  http://research.dfci.harvard.edu
Boston, MA 02115              Choice is the Choice!

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