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Message Posted: Mon, 13 Nov 2000 @ 15:45:54 GMT
Some explain about I/O troubles :
Sometime when you are doing several big insert select or join (and you can see many wait I/O with the unix sar command), with schtool you see that only one partition is working ! the system seem to be hang for the other users (schtool is very interresting to see which performance group is consuming the system)
2 possible actions :
- decrease the weight of the partition
- change the policy of the allocation group
the first action is the best but if it doesn't work, you have to change the policy !
I've have observed that change the weight of the allocation is dangerous if you are not logical with the priority.
for instance : in the same partition if the weight of your $L is higher than $H, you risk to have a system hang for everybody -> system 100% idle (it had occured seval times before we understand it !)
DE LUCA CLAUDIO
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