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482
FAST not working properly.....
The FAST movement is very low, the apps team is complaining of high response times and I do see 15-20 read/write respone times on Vmax. Even though the policy is default 100-100-100 most of the data is moving to SATA only. Any work around to resolve the issue.
Also this is a very high i/o frame with Back end DA utilizaation of 70-80%. Is there any relation between FAST and DA utilizaion. Enguinity 5876
PedalHarder
465 Posts
0
November 10th, 2013 16:00
If you are suffering write response time issues, it is quite possible the issue is on the front-end not FAST related. You are only likely to be getting write response issues when device / system write-pending is reached. At 5876.229 DA does report higher CPU utilistion than actual. There are fixes available for the DA CPU reporting. Take a look at your front-end utilisations... are you seeing response time issues across all FA's regardless of their utilisation?
Quincy561
1.3K Posts
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November 10th, 2013 22:00
It is difficult and time consuming to try and troubleshoot performance issues on the support forums.
As long as WP counts are low, if you see high write response times it could be a front-end issue.
What code are you running? Is there an SR open?