BES Blackberry Enterprise Server very slow on email while Exchange is being backed up with backup exec 11d

Hi,

While I run a backup job (backup exec 11d, win2003, GRT only) for my exchange 2003 server, my BES (which always work fine) works very slowly and email are delivered to devices after a long time if ever). Once the backup is done (or being stopped) then everything returns to normal.

One strange thing is that ActiceSync and Outlook clients are not affected by the backup job. My store is 160GB.
I have a dell tape library that works pretty fast for files.

I contacted RIM's support and they say that the BES threads are failing to communicate with the server. This happened also with an older version of BES.
I don't see any high memory or CPU on the exchange server.

Thanks much for your help!
gilsolutionsAsked:
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dmbgoCommented:
You could try dropping the priority of the backup exec job by right clicking on the backup job and selecting priority in the backup exec mgt window.
What is the network topology between the BES and Exch?
simonpainterCommented:
It sounds like a disk IO issue. Check the disk queues using perfmon. Alternatively it's worth making sure that the exchange tools on the bes are the same service pack/patch level as the exchange server they are communicating with to ensure that CDO.dll is at the same version (different versions can cause problems with communication).
gilsolutionsAuthor Commented:
Hi,
The BES and Exchange are on the same switch and subnet as well as the backup server.
Exchange tools on the BES and exchange are the same version exactly.
Attached is the disk queue graph.
Any thoughts?

Thanks
disk-queue.bmp
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simonpainterCommented:
What disks do you have on the exchange server? 10k or 15? SCSI? Mirroring or stripes? It looks from perfmon that the disk IO is the bottleneck.
gilsolutionsAuthor Commented:
There are state of the art (the most expensive drives you can find) SCSI 15K RPM HDs.
There are 2 mirrored drives.
simonpainterCommented:
Is the backup box on a different server from the exchange server?
gilsolutionsAuthor Commented:
yes.
Thanks
simonpainterCommented:
BES uses MAPI just like the Outlook clients so it's pretty hard to diagnose this if you are sure that there is currently no impact on the Outlook users. Do you back up the BES database? Is that part of the same backup job?

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gilsolutionsAuthor Commented:
I don't backup the BES database at all.
Thanks
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