Re: Does Glance Average reports Lie
From: Tim Shoaf (none_at_nowhere.com)
Date: 04/09/05
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Date: Sat, 09 Apr 2005 05:28:28 GMT
This is a popular misconception about Glance. The disk utilization line
at the top of glane only represents your "hottest" (most heavily
utilized) disk. It is not an average of all disk activity. Change to
the I/O By Disk screen and you should be able to find a single disk that
shows the same utilization as the bar. You have to check I/O in many
differnent places within glance to get a feel of an I/O or disk
bottleneck.
Tim
bnsarma@gmail.com wrote in news:1112890609.613491.61450
@o13g2000cwo.googlegroups.com:
> Greetings,
>
> I apologize, if this is already answered.
>
> This is a HP UX box 4 CPU 16 Gig Ram
>
> uname -a
> HP-UX iheprdb3 B.11.11 U 9000/800 2403296044 unlimited-user license
> We are using EMC disk Array.
>
> We have oracle Database, which is very Busy doing lots of Logical IOs,
> we are trying to resolve that => Indexes and SQL tuning
>
> We see Glance Disk Average @100% Consistenelty during a sample time of
> say 20 minutes , but If I select to see the Filesystem (i) ,I only see
> one of two files systems being bussy with high Logical Reads.
>
> We also have sar reports for the same time and sample period, where we
> see one or two disks getting high servr times once in a while, not
> consistently .
>
> How should We interpret Glance Average times.
>
> Please advice.
>
> Regards & Thanks
> BN
>
>
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