Through-put speed is suddely slow for a Domino server with DAOS-enabled

[cristiandaloisi]

The customer has a BE 2010 R2 + all agents (windows/lotus domino), including a remote agent for lotus domino 8.5.2 fp 1.

Just since friday, the though-put of the Lotus Domino (with Daos-enabled mailboxes) server (using the Domino remote agent) just dropped from 2.200 MB/min to 230 MB/min (more or less), so the entire backup time is lasting too much but is finishing correctly.

I understand that there could be many reasons for this problem (cpu, Domino server, DAOS feature, BE server, net, ...):
the customer states that there are not any extra traffic on the network.

What could I do to find the reason for that performance bottle-neck? Any BE switch to record some performance issue?

Is it a problem related to Domino and to DAOS-enable mailboxes?

Any hint is welcome.

Thanks,
Cristian

[CraigV]

Hi Cristian,

You can try restarting the RAWS agent, but sometimes a reboot of the server fixes this. You can test the throughput between the media server and the LN server by copying multiple small files, followed by a couple of large files between both servers. If the copies are slow, it indicates a network problem.

Thanks!

[pkh]

1) Make sure that there are no Domino housekeeping jobs, like fix or compact, going on during the time of the backup.

2) You are using BE 2010 R2.  While it may not help, I would suggest that you upgrade to BE 2010 R3. Your existing licence keys will work.  You can download BE 2010 R3 from either the fileconnect site or www.backupexec.com. After your upgrade, do not forget to run LiveUpdate to update it to SP1 and run LU again after that it update with all the hofixes since SP1.

3) There is a discussion which claims that DAOS slows things down

https://www-secure.symantec.com/connect/forums/daos-disk-savings-negated-13-loss-backup-throughput-performance

[cristiandaloisi]

Hi Craig

unfortunately restarting the RAWS agent did not help.

When you say "Restarting the server", you mean restarting the Lotus Domino server?

Your advice to copy several small files followed by a few big files, does it relate to Lotus Notes / Domino mailbox with DAOS feature enabled?

I'm using the BE agent for Lotus Domino.

Thanks in advance

Cristian

[CraigV]

Hi,

Yes, restart the actual server.

The files to be copied can be anything...doesn't matter what, as all you're wanting to check here is network throughput between the media server and the Lotus Notes server.

Thanks!

[CraigV]

Hi,

Yes, restart the server.

Doesn't matter what you copy...it's basically to test network throughput between your media server and remote Lotus Notes server.

Thanks!

[teiva-boy]

DAOS does slow things down.  You're going from a large database, to backing up thousands of little files.  Large contiguous files are ALWAYS faster to back up, then lots of little ones.

DAOS was made to save space on the server, and allow for better performance by splitting up the data into tiers of storage.  However, it'll compromise backup performance too.

So you need to weigh the risks of features and move towards the requirements set forth for the business.