Re: ADSM Storage Pool Performance
1999-11-30 08:32:46
Hi Jerry,
High disconnect times on ADSM-Pools can have the following reasons:
SEEK on disks
One reason could be that you have defined a lot of little "ADSM-Volumes"
(f.e 1 or more for each client) so adsm has to "seek on disks"
An other Reason: to much tasks accessing the same disk.
SEEK in the ADSM-POOLs
If you do not empty your disks pools, the data sent by trhe clients
"defrags" ( a lot of little pieces not tight toghter) this causes
"intraseeks", which means
seeking IN a dataset.
Not enough channels
If the I/Os have to wait to get connection to the channel, then
disconnect times raises.
We run our ADSM on OS/390 2.6 with DASD on HDS 7700E.
We get about 25ms busy (20ms connect) and about 20% busy.
_________________________________________________
Kind Regards Andreas Buser
Tel: ++41 61 285 73 21 Fax: ++41 61 285 70 98
Email: Andreas.Buser AT Basler DOT ch
Address: Basler Versicherungen Andreas Buser Abt. Informatik Aeschengraben
21 4002 Basel Switzerland
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