Forum Discussion

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.

  • Marianne's avatar
    Marianne
    Level 6
    13 years ago

    You need to give us more info...

    Firstly, why NBU 7.0?

    Symantec recommends 7.1 with latest patches or 7.5 with latest patches.

    Tell us more about your setup:

    Have you tested disk read speed on the client? How fast can the client read its own data?

    What kind of network link between server and client? Have you tested network speed by ftp'ing some data from client to server?

    What are you backing up on the client?
    Have you enabled multiple data streams for data to be backed up?
    Have you increased max jobs per client? (The default is 1)

    Is Multiplexing enabled in Storage Unit and Policy schedules?

    As you can see, the entire data path from client disk right down to media server tape drive needs to be checked. There are lots of ways to increase backup performance, but you first of all need to examine each component of the data path.

    See NetBackup™ 7.0 - 7.1 Backup Planning and Performance Tuning Guide for detailed info.

     

  • cynthiapinto's avatar
    cynthiapinto
    Level 4
    13 years ago

    Hi Marianne,

     

    We have lincese to download onlt NBU7.0 . I cannot download anyother version.  I have not installed any patches gor NBU.

    Client performance/Bandwitdth  is good.The connectivity between the servers & drive is LAN. 

    We are firing a nornal Standard backup i.e. a directories.

    multiple data streams is not enabled

    Max jobs per unit is 1 I have not increased

    No multiplexing is not enabled.

  • Marianne's avatar
    Marianne
    Level 6
    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.

  • Mark_Solutions's avatar
    Mark_Solutions
    Level 6
    13 years ago

    In addition to Mariannes excellent points.....

    If you are using an LTO4 tape library and backing up straight to tape and you have not done any tuning then as a first step do the following on the Media Server:

    Add a file named SIZE_DATA_BUFFERS (no file extension) to the netbackup\db\config directory on the media sever (directory does not exist by default)

    Open the file and put the value 262144 inside it

    Retry the backup to a new tape (used tapes will maintain their default 64kb block size and will need to be relabelled once they have expired in order to use th enew block size)

    See if this helps - With a 1gb network you should be able to back up in about 1 hour

  • cynthiapinto's avatar
    cynthiapinto
    Level 4
    13 years ago

    Thanks Marianne & Mark,

     

    I have done the changes as you said.  I will initiate a backup & come back to you soon

  • Marianne's avatar
    Marianne
    Level 6
    13 years ago

    Please create bpbkar log folder on client and bptm folder on media server before you start.

  • Marianne's avatar
    Marianne
    Level 6
    13 years ago

    Create directories under /usr/openv/netbackup/logs.

    e.g. on Master/media server:
    mkdir /usr/openv/netbackup/logs/bptm

    On client:
    mkdir /usr/openv/netbackup/logs/bpbkar

    No restart is needed for these logs - they just need to exist before backups are started.

  • cynthiapinto's avatar
    cynthiapinto
    Level 4
    13 years ago

    Hi,

     

    I had initaited the backup last weekend. My backup window is not reduced.  I have done all the above mentioned changes. 

    Please help to over come this. Attached the logs