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тАО11-03-2004 09:48 PM
тАО11-03-2004 09:48 PM
I have one N4000 with HP/UX 11.00. I want to make a backup using fbackup command but I see that fbackup write 3 Mb each second. If I want to save 300 Gb I will spend around 27 hours.
Some tools like Legato Networker or Veritas NetBackup write 30 Mb each second.
How can I increase my fbackup performance to increase the velocity?
Thanks in advance.
Solved! Go to Solution.
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тАО11-03-2004 09:55 PM
тАО11-03-2004 09:55 PM
Re: Reduce fbackup time
Check this doc for a fbackup -c config file example.
Document description: How to improve fbackup performance with Ultrium drives
Document id: UBACKKBRC00010991
http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000073094866
Best regards,
Robert-Jan
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тАО11-05-2004 12:59 AM
тАО11-05-2004 12:59 AM
Re: Reduce fbackup time
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тАО11-05-2004 03:11 AM
тАО11-05-2004 03:11 AM
Re: Reduce fbackup time
There is Patch for that. Use last patch bundle. Also find max speed for your tape.
Change your tape with new one better LTO
device. Look for disk activity when you make backup. Try to find last FW for your SCSI CTL and Tape.
Test tape performance using DD command
#### use blank tape (new one) #######
time dd if=/dev/null of=/dev/rmt/XXX bs=1024k count=100
where XXX is your tape device file.
Try tar and compare backup time !
Use fbackup for same backup and compare.
What model is your TAPE ?
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тАО11-05-2004 11:12 AM
тАО11-05-2004 11:12 AM
SolutionFor fbackup, the default is for very old, very obsolete reel-to-reel tape drives. To override the defaults, you must create a config file and put new values in it for fbackup to use:
blocksperrecord 512
records 64
checkpointfreq 1024
readerprocesses 6
maxretries 5
retrylimit 5000000
maxvoluses 200
filesperfsm 2000
Save this as something like /etc/fbackup.config and then add it to your backup command line:
fbackup ... -c /etc/fbackup.config ...
This starts the maximum 6 reader processes, reduces the number of setmarks and checkpoints, and specifies a large blocksize. This should improve the backup speed significantly. (all this assumes that the tape drive is local to your computer and not over the network)
Bill Hassell, sysadmin
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тАО11-09-2004 07:17 PM
тАО11-09-2004 07:17 PM
Re: Reduce fbackup time
Thanks Bill I used the following config file (as you said me) and my backup was more fasters than the previous execution.
blocksperrecord 512
records 64
checkpointfreq 128
readerprocesses 6
maxretries 5
retrylimit 5000000
maxvoluses 100
filesperfsm 500
Thanks.