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тАО06-22-2009 05:57 AM
тАО06-22-2009 05:57 AM
Fc _%util =100%
We 'are using sar -H to check FC HBA activity on our servers . Even ,we 're not facing performance issue for now ,sar -*H shows 100% in %util .. but 0 ms in avwait and 2 ms in avserv .
Would you please help
Regards
Mohamed
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тАО06-22-2009 10:02 PM
тАО06-22-2009 10:02 PM
Re: Fc _%util =100%
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тАО06-22-2009 10:27 PM
тАО06-22-2009 10:27 PM
Re: Fc _%util =100%
Read man pages of sar.
Suraj
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тАО06-23-2009 03:06 AM
тАО06-23-2009 03:06 AM
Re: Fc _%util =100%
Please find attached sar -H 1 60 output . (averages )
Of course , sar man pages is not enough to understand 100% util & 0 ms avwait
Is it a trusted way to probe FC activity ?
Regards
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тАО06-23-2009 03:17 AM
тАО06-23-2009 03:17 AM
Re: Fc _%util =100%
On your db server nearly 3000 IO is done on each HBA(this is a high value actually). These are all read activity, we can say this is OLTP, IO size is 8K. In SAN environments there is no way to see the actual performance state of the storage so busy value is not a true performance indicator. The real values you need to take care is service time and avque. It seems good for you from your outputs.
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тАО06-23-2009 05:00 AM
тАО06-23-2009 05:00 AM
Re: Fc _%util =100%
Indeed ,main CI(SAP ) is running there ,and
although 100%Util seems fake , we 're planning to allocate two more FCs .(vPar!)
Do you think '% util' will decrease to half ? is it linear ? Any advice there
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тАО06-23-2009 05:54 AM
тАО06-23-2009 05:54 AM
Re: Fc _%util =100%
As i said before busy value is not a true performance indicator because from hp-ux we cannot see what happens beyond the storage cache and to the actual disks. So you need to add additional FC card? Look at service time and disk queues if thet are at acceptable values then it means they can do more IO. Another thing you can look is your FC card max IOPS and storage performance values.
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тАО06-24-2009 12:32 AM
тАО06-24-2009 12:32 AM
Re: Fc _%util =100%
Many thanks & regards