01-22-2013 05:43 AM
Hi,
If I don't have the SIZE_DATA_BUFFERS & NUMBER_DATA_BUFFERS files does that mean I am using the default values?
If so, what are they? I am experiancing slow duplication from disk to tape, and I am trying to troubleshoot. See snippet below, I don't know if it's normal for these delays.
Windows 2003 NBU 7.5.0.3
22/01/2013 13:03:59 - awaiting resource XXXXXSTU-3Drives - No drives are available22/01/2013 13:06:31 - granted resource PJ476222/01/2013 13:06:31 - granted resource HP.ULTRIUM3-SCSI.00022/01/2013 13:06:31 - granted resource XXXXX-STU-3Drives22/01/2013 13:06:33 - Info bptm(pid=7424) start22/01/2013 13:06:33 - started process bptm (7424)22/01/2013 13:06:35 - Info bptm(pid=7424) start backup22/01/2013 13:06:36 - Info bpdm(pid=11036) started22/01/2013 13:06:36 - started process bpdm (11036)22/01/2013 13:06:36 - Info bpdm(pid=11036) reading backup image22/01/2013 13:06:36 - Info bpdm(pid=11036) using 30 data buffers22/01/2013 13:06:36 - begin reading22/01/2013 13:06:38 - Info bptm(pid=7424) media id PJ4762 mounted on drive index 0, drivepath {2,0,1,0}, drivename HP.ULTRIUM3-SCSI.000, copy 222/01/2013 13:06:38 - Info bptm(pid=7424) INF - Waiting for positioning of media id PJ4762 on server XXXXX for writing.22/01/2013 13:21:21 - end reading; read time: 00:14:4522/01/2013 13:21:21 - begin reading22/01/2013 13:22:59 - Info bptm(pid=7424) waited for full buffer 47068 times, delayed 61934 times22/01/2013 13:23:00 - end reading; read time: 00:01:3922/01/2013 13:23:01 - Info bpdm(pid=11036) completed reading backup image22/01/2013 13:23:04 - Info bpdm(pid=11036) using 30 data buffers22/01/2013 13:23:04 - begin reading22/01/2013 13:37:15 - end reading; read time: 00:14:1122/01/2013 13:37:15 - begin reading
01-22-2013 07:37 AM
Below must help you in setting sizes
Default Shared Buffers
http://www.symantec.com/docs/HOWTO56152
Check Mark's solution on how to
https://www-secure.symantec.com/connect/forums/how-data-buffer-size-and-buffer-number-effect-netbackup-backup-and-restore-performance#comment-6479631
01-22-2013 03:42 PM
"waited for full buffer 47068 times, delayed 61934 times"
When you see the above messages, it means media server is waiting for full buffer to write into for that many times, increasing your buffer size does not always help in this case. You will have to find out the bottleneck of why it's slow to free up the full buffer (from the client end). It could be the network issue or client has a very poor I/O.
Some guidelines on troubleshooting this: http://www.symantec.com/docs/TECH18422
01-22-2013 09:04 PM
Have a look at these links:
http://www.symantec.com/docs/TECH35968
Backup Planning and Performance Tuning Guide http://www.symantec.com/docs/DOC4483
01-23-2013 02:52 AM
Thanks I've created the two files as suggested.
We have 2 staging and 2 tape libraries, one is running ok. I've noticed in the All Entries Log that the problomatic tape library has very slow transfer speeds to tape (100kb/sec or less) but I've also noticed that the file sizes it is backing up are usually very small, they bigger they are the faster the transfer rate it (obviously, this is as expected) Could someone take a look at this and give their opinion?
I have attached the file. The media server XXXXBKP is the one that runs ok and XXXX75 is th slow one.
01-23-2013 03:05 AM
bptm log on problematic media server will be more useful than All Log Entries report.
01-23-2013 05:35 AM
I added the two buffer size files about 09:30 this morning for your information.