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If your running the tapes on Solaris, the iostat utility will show the
throughput on st devices as well as disks and ttys.  If thats what your
looking for, start with "iostat -xE" to list all the device names as needed
by the iostat utility.  Might show something like this:

st15      Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: HP       Product: Ultrium 2-SCSI   Revision: S33H Serial No:

You can then run that against iostat as in "iostat st15 2"

Thanks
Peter

Peter DrakeUnderkoffler
Xinupro, LLC
617-834-2352



Ed Wilts wrote:
>>Our numbers vary greatly according to the clients.  We have very old
>>Solaris machines that backup at 50+ MB/sec.  We have very new Windows
>>machines where throughput varies greatly between different volumes on
>>the same machine (e.g. a volume with 5 million tiny files backs up at
>>30 MB/sec via FlashBackup, while another volume on the same machine
>>gets about 7 MB/sec backing up small files via FlashBackup).
>>
>>It's difficult to get good numbers because we use multi-streaming and
>>multiplexing like crazy.  So the actual throughput to the drive is the
>>sum of the jobs using the drive at that moment.  Individual jobs vary
>>between 5 MB/sec and about 65 MB/sec.  But the total throughput to the
>>tape heads is unknown.
>>
>>Anyone know an easy way to calculate that?
> 
> 
> If your drives are fibre-attached, use something like MRTG to grab the fibre
> port stats and graph that.  That gives us a pretty good idea as to what the
> tape speeds are. 
> 
> --
> Ed Wilts, Mounds View, MN, USA
> mailto:ewilts AT ewilts DOT org
> I GoodSearch for Bundles Of Love:
> http://www.goodsearch.com/?charityid=821118 
> 
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
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