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тАО10-27-2009 03:59 AM
тАО10-27-2009 03:59 AM
fbackup: Why do jobs run slower on new HP-UX machine?
Hi all,
I am running an fbackup job on a 9000/785 box with HP-UX 10.20 A to backup some files on a couple of HP-UX 10.20 machines across the network to another HP-UX server with an external tape drive.
Recently I have changed the server's hardware from a 9000/800 machine running HP-UX 11.11 and a DDS 4 tape drive to an IA64 based machine with HP-UX 11.31 using an DAT72 tape drive.
Before the change the job has run for approx. 50 minutes but now it takes 4 hours!
Any idea about the reason?
I am running an fbackup job on a 9000/785 box with HP-UX 10.20 A to backup some files on a couple of HP-UX 10.20 machines across the network to another HP-UX server with an external tape drive.
Recently I have changed the server's hardware from a 9000/800 machine running HP-UX 11.11 and a DDS 4 tape drive to an IA64 based machine with HP-UX 11.31 using an DAT72 tape drive.
Before the change the job has run for approx. 50 minutes but now it takes 4 hours!
Any idea about the reason?
- Tags:
- fbackup
2 REPLIES 2
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тАО11-13-2009 12:10 AM
тАО11-13-2009 12:10 AM
Re: fbackup: Why do jobs run slower on new HP-UX machine?
Hello Frank,
the reason for this might be that the tape is faster, but the collection of data is not fast enough. So your tape drive has to do a lot of repositionings, which is not good for the media and also the tape drive.
You might check the following document:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460
I think you need to make it somehow faster, maybe more reader processes in fbackup. Also using a remote tape might be the issue, because fbackup uses a generic tape model for this. Maybe there is a way to tell fbackup what tape drive model you use to make it more efficent, but I am not a fbackup specialist.
Ralf
the reason for this might be that the tape is faster, but the collection of data is not fast enough. So your tape drive has to do a lot of repositionings, which is not good for the media and also the tape drive.
You might check the following document:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460
I think you need to make it somehow faster, maybe more reader processes in fbackup. Also using a remote tape might be the issue, because fbackup uses a generic tape model for this. Maybe there is a way to tell fbackup what tape drive model you use to make it more efficent, but I am not a fbackup specialist.
Ralf
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тАО11-13-2009 12:25 AM
тАО11-13-2009 12:25 AM
Re: fbackup: Why do jobs run slower on new HP-UX machine?
Hi Ralf,
sorry, I've got my issue settled in the meantime by our consultant. There have been some nonsense default values for fbackup:
blocksperrecord 32
records 32
checkpointfreq 32
We have replaced them by these new values:
blocksperrecord 8192
records 64
checkpointfreq 4096
and fbackup runs like hell again.
Anyway the document that you have mentioned is very interesting! Thanks for the link.
Kind regards,
Frank
sorry, I've got my issue settled in the meantime by our consultant. There have been some nonsense default values for fbackup:
blocksperrecord 32
records 32
checkpointfreq 32
We have replaced them by these new values:
blocksperrecord 8192
records 64
checkpointfreq 4096
and fbackup runs like hell again.
Anyway the document that you have mentioned is very interesting! Thanks for the link.
Kind regards,
Frank
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