Re: Store Taking Too Long
- From: Gilles Schipper <gilles@xxxxxxxxxx>
- Date: Fri, 3 Oct 2008 21:42:32 -0400
I'll definitely second that recommendation.
The other very useful bit of information offered by the "statistics" option - apart from tape output rate - is the number of tape i/o errors - which could significantly affect your times.
If you save every stdlist that included the "statistics" option, you could also easily compare no. of files stored, compression rate, i/o errors, i/o rate, total bytes output (compressed & uncompressed), etc.- and get a very accurate reading of exactly why your store times are increasing.
At 08:24 PM 08-10-03, Hawkins, Jim (ESS TCE Q&W) wrote:
No one seems to have yet mentioned the STATISTICS option, though it's mentioned often in connection with other threads. Looking at STDLIST and comparing the transferred bytes and I/O rates and elapsed time probably would give you some clues. If transferred bytes doesn't increase then check for new or changed jobs which might be stealing I/O or CPU bandwidth during back-up. There also can be subtle affects around compression features. Some folks with "extra" CPU can get better performance with STOREs COMPRESS options. Others get better results with enabling only the hardware compression -- enabling both historically could do weird things like actually EXPAND your data (and on 7980s actually corrupt it IIRC, no hard reference I can point to.) If my fingers remember correctly DEVCNTRL.MPEXL.TELESUP is one way to check on the hardware settings of the device.
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Gilles Schipper
GSA Inc.
HP System Administration Specialists
300 John Street, Box 87651 Thornhill, ON Canada L3T 7R4
Voice: 905.889.3000 Fax: 905.889.3001
email: gilles@xxxxxxxxxx web: http://www.gsainc.com
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- From: Gilles Schipper
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