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тАО03-17-2004 01:36 PM
тАО03-17-2004 01:36 PM
Slow backup of DLT 2/20
server (HP-UX OS). I have been backing up data using Omniback and had no problem.
Recently my backup time seems to be getting
longer. Sometimes normal , sometimes longer than normal ( by 10 minutes, 20 minutes, seomtimes by hours). The same tape I used a month ago with normal backup time , overshot
by 4 hours.
Please help.
Thank you.
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тАО03-18-2004 02:45 AM
тАО03-18-2004 02:45 AM
Re: Slow backup of DLT 2/20
what else is going on on the machine at that time? Do you have problems writing to tape?
greetings,
Michael
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тАО03-18-2004 03:58 PM
тАО03-18-2004 03:58 PM
Re: Slow backup of DLT 2/20
Poor write error rate will dramatically reduce performance.
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тАО03-18-2004 03:59 PM
тАО03-18-2004 03:59 PM
Re: Slow backup of DLT 2/20
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тАО03-19-2004 08:31 AM
тАО03-19-2004 08:31 AM
Re: Slow backup of DLT 2/20
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тАО03-19-2004 01:08 PM
тАО03-19-2004 01:08 PM
Re: Slow backup of DLT 2/20
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тАО03-22-2004 09:37 PM
тАО03-22-2004 09:37 PM
Re: Slow backup of DLT 2/20
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тАО03-23-2004 12:42 AM
тАО03-23-2004 12:42 AM
Re: Slow backup of DLT 2/20
There is a 'media.log' file in omniback that collects the write error counters. This will show recovered (i.e. corrected) errors and the total bytes processes for each tape use.
You can use this to calculate a write error rate. If you take 1,000,000*(errors_corrected/total_bytes_processes), it will give you an error rate measured in errors per MB. You want this number to be less then 0.7, otherwise you are having measurable performance loss.