Backup Central

I have four media agents running windows 2008 sp2 with 24 GB RAM. As I have put more load on the system (3 TB night backups) I am starting to get issues with backups really slowing down. Aux copies to tape writing at only 1 GB/Hour etc. In talking to support they pointed out what they are calling a memory issue with my media agents. When I look at Physical Memory I see Total (MB) 24565, Cached 22725 and free 14 - 0. CommVault is stating I have a windows issue because the cached is so high. If I disable the Commvault services and reboot the agent my cached sits at around 1000 MB. The second I start the services and run jobs the cached slowly climbs to around 22722. In reading about the new memory manager in 2008 posts are stating this is normal and actually a much better way to allocate memory via cache rather than waiting and assigning physical memory.

Can someone comment on the cached aspect and how CommVault should use this memory? Also, wondering if R2 might help....Thanks again.


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I'm guessing this is disk to tape auxiliary copy .. have you tested to see what the read performance is from your disk and if you have a high level of fragmentation on said disk?

And do you do any direct-to-tape backups (D2T) and what speed do they run at?  (If not, can you create a test storage policy and try a backup of a large block of sequential data?)

Also what version of commvault and service pack are you running?

Luke


On 19 January 2011 10:45, erlarson2000 <erlarson2000 < at > yahoo.com ([email]erlarson2000 < at > yahoo.com[/email])> wrote:
 
I have four media agents running windows 2008 sp2 with 24 GB RAM. As I have put more load on the system (3 TB night backups) I am starting to get issues with backups really slowing down. Aux copies to tape writing at only 1 GB/Hour etc. In talking to support they pointed out what they are calling a memory issue with my media agents. When I look at Physical Memory I see Total (MB) 24565, Cached 22725 and free 14 - 0. CommVault is stating I have a windows issue because the cached is so high. If I disable the Commvault services and reboot the agent my cached sits at around 1000 MB. The second I start the services and run jobs the cached slowly climbs to around 22722. In reading about the new memory manager in 2008 posts are stating this is normal and actually a much better way to allocate memory via cache rather than waiting and assigning physical memory.

Can someone comment on the cached aspect and how CommVault should use this memory? Also, wondering if R2 might help....Thanks again.









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