Re: Disk Percent Busy, out of whack??

[DrFranken <midrange@xxxxxxxxxxxx>]

First snap was creating NWSSTG so similar sort of I/O Load to creating 
image catalog.

Second was clearing OFF large files from the IFS.


        - Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 10/2/2014 9:30 PM, Pete Massiello - ML wrote:

> I have seen this when you are applying PTFs or building image Catalogues.  Were you doing either?
>
> 	Pete
>
> --
> Pete Massiello
> iTech Solutions
> http://www.itechsol.com
> http://www.iInTheCloud.com
>
>
>
>
> -----Original Message-----
> From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
> Sent: Tuesday, September 30, 2014 2:26 PM
> To: Midrange Systems Technical Discussion
> Subject: Disk Percent Busy, out of whack??
>
> Elapsed time:   00:01:00
>
>        Pct   I/O     Rqs   Read  Wrt  Read  Write   %
> Unit Full  Rqs     Sz(K)  Rqs  Rqs    K     K    Busy
> 1    74.9  326.1   38.8   .0  326.1   .0   38.8   48
> 2    74.9  313.7   40.0   .0  313.7   .0   40.0    2
> 3    74.9  315.3   40.0   .0  315.3   .0   40.0    2
> 4    74.9  316.2   40.0   .0  316.2   .0   40.0    2
> 5    74.9  317.5   39.7   .0  317.5   .0   39.7    2
> 6    74.9  322.8   39.1   .0  322.8   .0   39.1    2
> 7    74.9  317.8   39.7   .0  317.8   .0   39.7    2
> 8    74.9  316.5   39.9   .0  316.5   .0   39.9    2
> 9    74.9  319.7   39.4   .0  319.7   .0   39.4    2
>
> All above drives are identical. (15K 140G SAS) All are in the same RAID set.
> All contain RAID Stripe data.
> Power8, i 7.2, Internal RAID controller.
> These drives (and the entire RAID set) are an iASP, so Drive 1 above is NOT the load source.
>
> ONLY job running on these drives is CRTNWSSTG.
>
> So over this one minute how can 1 of the drives be 48 percent busy and the others only 2%? The seemingly insignificant difference in I/Os just doesn't seem like it could possibly cause that large delta in percent busy!