RE: Long checkpoints on AIX/IDS7.31/IBM Shark

Thank you TBP, Dave & Alex for you suggestions, I have duly increased my LRUS to 128, and CLEANERS & NUMAIOVPS after looking at onstat -g iov and checking the io/wup column. We've found the culprit which affects all hosts connected to the same Shark (and there are quite a few) - it was a SQLServer box doing a large delete. How come the Shark misbehaves so badly due to one particular operation (ie. SQLServer delete, it's not volume related, the SAN is quiet and the reports on the Shark don't show any high throughput) is beyond me - and apparently beyond local support as well since we've struggled with this since November last year and we've blamed everything from the usual firmware thing to backups and what not (even found some new entries for my BOFH DIY excuse board). Sooo, you do something quite innocent on one box and you bring all critical systems in your entire enterprise to a grinding halt, and worse, you're not even able to tell. Now isn't that what mass storage is all about :-... Kind regards, ------------------------------------------- Willem Roos - (+27) 21 980 4941 Per sercas vi malkovri Disclaimer http://www.shoprite.co.za/disclaimer.html sending to informix-list