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High Memory Utilization During backup with DP6.20 and RedHat linux RHEL 5.8.

Occasional Contributor

High Memory Utilization During backup with DP6.20 and RedHat linux RHEL 5.8.

We just recently migrated a RAW DISK backup from an HPUX client to a Linux client.  While the backup is running, we noticed memory utiliziation on the Linux client rise from about 68% to 100%.  This 32% increase represents about an additional 100GB used during the backup.  Nothing is failing and measurements are through GLANCE.

 

Details of the environment:

DP 6.20 patched as of Feb 2012.

Cell Manager is HPUX running 11iv2.

Client is RHEL 5.8 with 250 GB of memory.

 

Backup is RAWDISK using 2 to 3 tape drives, each drive is set to 12 concurrencies, 64K blocksize and DA buffer = 8. 

 

We modified the DA buffer from 8 to 4 and then to 1.  There was NO improvement in the memory util and no adverse affects on the backup timing.

 

Has anyone experieneced similiar situations?

 

Thanks

Chuck

skybug
1 REPLY
Highlighted
Honored Contributor

Re: High Memory Utilization During backup with DP6.20 and RedHat linux RHEL 5.8.

Have not seen that so far. What component uses the large amount of memory? I think it might be related to system buffer cache rather than any Data Protector component. Does that mean you did the same RAW disk backup on a HP-UX before changing to Linux? Does the backup flow over network or are the tape drives attached using SAN?

Regards,
Sebastian
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