12-10-2012 08:37 PM
Greeting to all ...
I have two SAN media server which we recently build , We did certain test and from SAN media server A we are getting speed of 70 -100 MB/s , where as from SAN media server B we get max thoughput of 20 -30 MB/s .
-----Zoning are perfect
Cheer,
Rajesh Kumar
Solved! Go to Solution.
12-10-2012 09:27 PM
Start with troubleshooting outside of NBU.
1. Test read speed from disk using bpbkar test:
Increase logging level to 1
Create /usr/openv/netbackup/logs/bpbkar folder
Run: /usr/openv/netbackup/bin/bpbkar -nocont -dt 0 -nofileinfo -nokeepalives <filesystem> > /dev/null
Check results in bpbkar log
If read performannce is good, test write speed to tape:
2. Load a scratch/blank tape in a drive.
Use tar or cpio to write backup to drive.
Note time taken to write backup.
If both methods above shows good performance, then tune NBU buffers.
Create these 2 files:
/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS
add a value of 262144
/usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS
add a value of 32 (can be more if server resources are sufficient)
Ensure bptm log folder exists to verify effect of buffer settings.
12-10-2012 09:27 PM
Start with troubleshooting outside of NBU.
1. Test read speed from disk using bpbkar test:
Increase logging level to 1
Create /usr/openv/netbackup/logs/bpbkar folder
Run: /usr/openv/netbackup/bin/bpbkar -nocont -dt 0 -nofileinfo -nokeepalives <filesystem> > /dev/null
Check results in bpbkar log
If read performannce is good, test write speed to tape:
2. Load a scratch/blank tape in a drive.
Use tar or cpio to write backup to drive.
Note time taken to write backup.
If both methods above shows good performance, then tune NBU buffers.
Create these 2 files:
/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS
add a value of 262144
/usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS
add a value of 32 (can be more if server resources are sufficient)
Ensure bptm log folder exists to verify effect of buffer settings.
12-11-2012 02:02 PM
GEN_DATA directive is pretty nice to isolate performance issue. You can measure performance between media server and storage unit in NetBackup. No need to mount tape manually.
http://www.symantec.com/docs/TECH75213
12-16-2012 03:49 AM
I Just change the Data_buffer_size from 128 to 256 and Now i see a fair speed its writing the data.
Hope this resolve the issue , Also the backup use to take 4 days to complete Now its taking just 2 days..
so think the next step would be changing it o 512.
any suggestion are Appriciated .
cheer,
Rajesh Kumar
12-16-2012 07:03 AM
See my earlier post on 9 December: https://www-secure.symantec.com/connect/forums/linux-san-media-server-performances-issue-low-speed#c...