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cynthiapinto's avatar
cynthiapinto
Level 4
13 years ago
Solved

Taking too long time to finish backup

Hi,

 

I have installed Master & Media server (1single server) with VNB 7.0 & the server is having RHEL OS . Also installed  VNB 7.0 client in the other RHEL server

I initiated 300Gb of backup & took for me almost 7hrs to complete. I use the tape library with LTO4 tapes.

Need a help to bring down the backup window. 

7.1.x and Earlier
Backing Up
Backup and Recovery
Best Practice
NetBackup
Performance
  • Marianne's avatar
    Marianne
    13 years ago

    Please take time and read through the Perf Tuning guide.
    Go through the exercise to test disk read speed with bpbkar followed by a network copy, such as ftp. Also see buffer tuning section, but only change buffers once you have analysed default settings in bptm log (details in the Tuning guide).

    A quick win is normally to increase max jobs per client to +- 4, allow multiple data streams in policy attribute (assuming that Backup Selection is ALL_LOCAL_DRIVES or multiple filesystems), increase MPX value in STU to 4 as well as MPX of 4 in Policy schedule.

    Hope this helps.

    PS: Updated license keys are free if NBU maintenance is up to date.

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  • mph999's avatar
    mph999
    Level 6
    13 years ago

    This could be the issue :

    bptm 

     

     
    12:04:32.323 [4979] <2> write_data: waited for full buffer 1097037 times, delayed 1577467 times
    18:05:54.470 [20292] <2> write_backup_completion_stats: waited for full buffer 922531 times, delayed 1329217 times
    11:55:58.273 [8893] <2> write_data: waited for full buffer 1065630 times, delayed 1545769 times
    12:04:07.965 [20355] <2> write_data: waited for full buffer 1092553 times, delayed 1575131 times
    17:50:14.602 [3458] <2> write_backup_completion_stats: waited for full buffer 900244 times, delayed 1287709 times
     
    On the media servers, what values do you have in these files :
     
    /usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS
    /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS
     
    I would suggest in size data buffers you put 262144 and in nymber data buffers 64 and see if that makes a diffrence.
     
    If the tuning values are already set, then it would most likely be an issue getting the data to the media server, that is an issue either with the read speed of the disk, or the network between the client and the media server.
     
    Martin
     
     
  • Marianne's avatar
    Marianne
    Level 6
    13 years ago

    Please perform the 'bpbkar' test on the client to test read speed from disk.

    Extract from Performance tuning guide:

     

    Measuring disk performance with bpbkar
    Use this procedure to measure disk I/O using bpbkar
     
    1. Turn on the legacy bpbkar log by ensuring that the bpbkar directory exists.
    /usr/openv/netbackup/logs/bpbkar
     
    2.  Set logging level to 1.
    3. Enter the following:
    /usr/openv/netbackup/bin/bpbkar -nocont -dt 0 -nofileinfo -nokeepalives /u01/app/oracle/Backup > /dev/null  
     
    4. Check how long it took NetBackup to move the data from the client disk:
    UNIX: The start time is the first PrintFile entry in the bpbkar log. The end
    time is the entry "Client completed sending data for backup." The amount of
    data is given in the entry "Total Size."

     

    The bpbkar command will probably run for quite a while. You can check client's process table with 'ps -ef |grep bpbkar'. When bpbkar process has finished, rename the log to bpbkar.txt and post here as file attachment.

  • cynthiapinto's avatar
    cynthiapinto
    Level 4
    13 years ago

    Marianne,

     

    I have done the above said. I have attached the bpbkar logs.

    Now the client,master,media servers are in same VLAN & connected to the same switch. Still backup window is not reduced.

  • Marianne's avatar
    Marianne
    Level 6
    13 years ago

    We can see that you started the bpbkar test at 18:00:25.
    It finished at 19:02:30.

    So, about an hour to read ± 263.8GB.
    We now know that read speed from disk is good.

    Next step is to test network speed. 

    Find a file under /u01/app/oracle/Backup/ that is at least 1GB in size.
    Ftp this file to the master/media server.

    Let us know what the result is.

  • cynthiapinto's avatar
    cynthiapinto
    Level 4
    13 years ago

    Thanks Marianne for all the inputs you have given to me.

     

    I have move the Master/Media/Client to the same VLAN & to same switch.  now the backup s going on really good. Could finish 250Gb of data withing 30 Mins. 

     

    Thank you all for your support.