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SAN backup is running very slow

Created: 03 Oct 2013 • Updated: 04 Nov 2013 | 9 comments
rajkumarbaniwal's picture
This issue has been solved. See solution.

HI,

 

My enterprise client backup is running very slow. How to troubleshoot it?

Master server : Solaris Netbackup 7.1.0.3

Speed is very slow. its equal to LAN(3Mbps) speed. Done some performance tuning also but still speed is slow.

Operating Systems:

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Marianne's picture

Is San Media server (Enterprise Client) also on Solaris?

First of all - test read speed from disk.
Use bpbkar to read data and send to null device. 

You can find details about bpbkar test (for Unix and Windows) in the Performance Tuning Guide:  http://www.symantec.com/docs/DOC4483

Supporting Storage Foundation and VCS on Unix and Windows as well as NetBackup on Unix and Windows
Handy NBU Links

rajkumarbaniwal's picture

Hi marianne,

 

Yes, SAN Media server is also on Solaris

 

Thanks and regards,

Rajkumar Baniwal

Netbackup 7.0 Certified

Marianne's picture

See 'Measuring disk performance with bpbkar' on page 102 of the Perf Tuning Guide. (Link in my previous post.)

Supporting Storage Foundation and VCS on Unix and Windows as well as NetBackup on Unix and Windows
Handy NBU Links

rajkumarbaniwal's picture

Hi Marianne,

 

tested with bpbkar test.It took 3 min for 135MB. I think its fine. but backup is still slow

 

Thanks and regards,

Rajkumar Baniwal

Netbackup 7.0 Certified

revaroo's picture

That is poor performance. I would check your disks with your OS support.

Yasuhisa Ishikawa's picture

3 min for 135 MB = 0.75 MB/sec = 6Mbps. Usually, such performance is came from client disk or filesystem performance. How much size of data you are to backup? How many files there?

Please test with your primary backup target data if you ran bpbkar with test data.

Authorized Symantec Consultant(ASC) Data Protection in Tokyo, Japan

rajkumarbaniwal's picture

As confirmed with OS Team, Mount point of the server is ZFS file system.

mount point size is 2 TB. and used space is 1.5 TB. Backup is still running from last two days through fibre(SAN). Getting speed of 3MBPS in SAN. that 's the main issue.

 

Thanks and regards,

Rajkumar Baniwal

Netbackup 7.0 Certified

revaroo's picture

bpbkar can only read your disks at low speed, therefore there is an issue with disk read performance - not a netbackup issue!

SOLUTION
Marianne's picture

I agree with revaroo - forget about NBU! Use something like tar to backup this filesystem to /dev/null:

time tar cBf /dev/null /mount-point

Show results to OS and SAN team.

Supporting Storage Foundation and VCS on Unix and Windows as well as NetBackup on Unix and Windows
Handy NBU Links