ADSM-L

Re: I/O wait on NFS very high.--Help.

2003-04-01 14:11:25
Subject: Re: I/O wait on NFS very high.--Help.
From: "PINNI, BALANAND (SBCSI)" <bp3965 AT SBC DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 1 Apr 2003 13:10:27 -0600
Rich

I applied fix IY34604 and things have improved ,but IO still has
considerable wait time!!!

Any more ideas please!!!

0  1 164178 72160   0   0   0   0    0   0 2499 5071 679  1  4 46 49
0  1 164178 71136   0   0   0   0    0   0 3295 4808 703  1  4 48 46
thr     memory             page              faults        cpu
---- ----------- ------------------------ ------------ -----------
r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa
0  1 164178 70624   0   0   0   0    0   0 1674 4835 455  1  2 48 49
0  2 164178 69600   0   0   0   0    0   0 2341 4856 661  0  5 20 75
0  1 164178 69088   0   0   0   0    0   0 3187 4805 678  0  4 36 60
0  1 164178 68064   0   0   0   0    0   0 2549 4798 642  0  5 50 44
0  1 164178 67296   0   0   0   0    0   0 2676 4834 651  0  3 49 48
0  2 164178 66272   0   0   0   0    0   0 3049 4819 680  0  8 46 46
0  2 164178 65248   0   0   0   0    0   0 3070 4822 702  0  6 45 48
0  1 164178 64480   0   0   0   0    0   0 2278 4880 610  0  4 46 49
2  0 164178 63648   0   0   0   0    0   0 3024 4840 882  0  9 50 41
0  1 164178 62176   0   0   0   0    0   0 4377 4822 860  1  6 46 47
0  2 164178 61344   0   0   0   0    0   0 3845 4851 957  1  4 22 73
0  1 163813 59981   0   0   0   0    0   0 4475 4027 916  2  7 45 46
0  1 163813 58445   0   0   0   0    0   0 4607 2733 920  0  8 43 50
0  1 163813 57421   0   0   0   0    0   0 3009 2755 716  0  4 46 50
0  1 163813 54605   0   0   0   0    0   0 6634 2777 1189  2  8 34 55

-----Original Message-----
From: PINNI, BALANAND (SBCSI)
Sent: Tuesday, April 01, 2003 9:41 AM
To: 'ADSM: Dist Stor Manager'
Subject: RE: I/O wait on NFS very high.--Help.

Thanks a million Rich I will work on this .

Balanand Pinni


-----Original Message-----
From: Richard Foster [mailto:Richard.Foster AT HYDRO DOT COM]
Sent: Tuesday, April 01, 2003 2:15 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: I/O wait on NFS very high.--Help.


> I have db volumes on netapp filer on NFS .And when ever disk is
> accessed I see 99% wait on DISK FOR cpu?

We see a very similar problem. We have a storage pool on NetApp, and
whenever we migrate, we get huge wait times. It's caused by paging and is
an AIX problem, which pages out computational pages in error (ie, it has to
page them straight back in again in order to continue).

There is a fix for AIX 5.1 (IY34604) and IBM are working on a fix for AIX
4.3.3 (IY42425). Our PMR number is 87678,001,806 if you want your support
to follow it that way.

Good luck
Richard Foster
Norsk Hydro asa

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