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VMware Backups running slow on tape drives and Disk

Created: 17 Jun 2013 • Updated: 05 Jul 2013 | 3 comments
Iype's picture
This issue has been solved. See solution.

Hi, have a problem in running backups to tapes drives, as its going very slow.

We have a VM proxy media server with 6 IBM tape drives zoned to the server.

VM proxy media server configuration is 2008 R2. we have 8gp sfp also installed. This media server is used to take only VMware backups using the vstorage api.

2 copies are taken at a time for each VM servers. The backup take to tape is running slow so we are not able to finish the backup within SLA. I need to know if there is any parameters that we need to set to increase the speed of backup when taking to tape drive. The tape drives are running with the latest IBM tape drive version, still we dont see any increase in performance.

Currently we have only 2 parameter set for the windows VM media server:

NET_BUFFER_SZ = 10485760
STAGING_JOB_KB_LIMIT = 99614720
 
Can you let me know what parameters and values need to be set for windows 2008 R2 server.
 
 
 
Operating Systems:

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Nicolai's picture

Take a look at the NUMBER_DATA_BUFFERS / SIZE_DATA_BUFFERS. These setting can improve tape performance. However VMware tuning is tricky task so expect to tune elsewhere.

http://www.symantec.com/docs/TECH1724

http://www.symantec.com/docs/TECH19206

http://www.symantec.com/docs/TECH18422

Take a look at the NetBackup 7.1 Backup Planning and Performance Tuning Guide also. It a good source of tip and tricks.

http://www.symantec.com/docs/DOC4483

Assumption is the mother of all mess ups.

If this post answered your'e qustion -  Please mark as a soloution.

Iype's picture

Hi Dyneshia, just went through the TN: but i would like to know what values would be best for our environment.

I have given, for which backup was going in a good speed

NUMBER_DATA_BUFFERS = 256
SIZE_DATA_BUFFERS = 262144
 
But not sure if above settings will impact the system performace.
 
Tape Drive Parameters details:[IBM LTO5 tape drives]
Maximum block Size = 8388608 
Minimum block size = 1
Default Block size = 65536
 
Media server details:
CPU Type: Intel(R) Xeon(R) CPU E5649 @ 2.53GHz 
Clock Speed (MHz): 2533 
Number of logical CPUs: 24 
Installed Memory (MB): 16374 
Operating System:  Windows / Windows 2008 Enterprise R2 x64 

Total Tape drives: 6
Multiplexing : 16 per/drive

Can you help in how to identify the required values for the environment.