[Ocfs2-users] Extremely high memory usage and iowait times

[Sunil Mushran]

Can you describe your usage and your setup a bit?

On 09/07/2010 11:55 AM, Dan Lark wrote:
> I know this has been discussed before, but I am seeing high iowait times and the occasional deadlock between my two node OCFS2 cluster. I will be turning on "noatime" for the mount on both nodes in a maintenance window, which should help. What I am not sure of, whether that will be of much help.
>
> For example, sar is reporting the following from one of the nodes over the last little bit:
>
> 10:00:01 AM       CPU     %user     %nice   %system   %iowait    %steal     %idle
> 10:10:01 AM       all      2.45      0.00      5.11     23.94      0.00     68.51
> 10:20:01 AM       all      2.61      0.00      5.56     23.50      0.00     68.33
> 10:30:01 AM       all      2.22      0.00      5.31     23.27      0.00     69.20
> 10:40:01 AM       all      2.48      0.00      5.27     23.83      0.00     68.42
> 10:50:01 AM       all      2.53      0.00      5.29     22.02      0.00     70.16
> 11:00:01 AM       all      2.39      0.00      5.66     24.42      0.00     67.53
> 11:10:01 AM       all      2.78      0.00      5.75     30.11      0.00     61.37
> 11:20:01 AM       all      2.90      0.00      5.74     25.83      0.00     65.53
> 11:30:01 AM       all      2.78      0.00      5.61     24.49      0.00     67.12
> 11:40:01 AM       all      2.78      0.00      5.37     24.43      0.00     67.41
> 11:50:01 AM       all      2.64      0.00      5.00     21.90      0.00     70.47
> 12:00:01 PM       all      2.60      0.00      5.41     24.22      0.00     67.78
> 12:10:01 PM       all      2.51      0.00      5.20     23.89      0.00     68.39
> 12:20:01 PM       all      2.50      0.00      5.02     25.70      0.00     66.78
> 12:30:01 PM       all      2.49      0.00      5.24     24.61      0.00     67.67
> 12:40:01 PM       all      2.53      0.00      4.90     24.36      0.00     68.21
> 12:50:01 PM       all      2.32      0.00      4.81     23.18      0.00     69.69
> 01:00:01 PM       all      2.38      0.00      4.92     23.07      0.00     69.64
> 01:10:01 PM       all      2.09      0.00      5.17     23.45      0.00     69.29
> 01:20:01 PM       all      2.63      0.00      5.35     23.24      0.00     68.77
> 01:30:01 PM       all      2.28      0.00      4.63     25.15      0.00     67.93
> 01:40:01 PM       all      2.39      0.00      4.76     20.93      0.00     71.92
> 01:50:01 PM       all      2.24      0.00      4.95     24.81      0.00     68.01
> 02:00:01 PM       all      2.36      0.00      4.99     27.45      0.00     65.19
> 02:10:01 PM       all      3.31      0.00      6.65     43.20      0.00     46.85
> 02:20:01 PM       all      2.88      0.00      6.47     42.47      0.00     48.18
> 02:30:01 PM       all      2.66      0.00      6.61     44.67      0.00     46.06
> 02:40:01 PM       all      2.67      0.00      5.97     43.46      0.00     47.90
>
> The iowait percentage is evening itself back down, but a 44.67% iowait? WOW! Any suggestions?
>
> Specs:
> OEL 5.5 - Kernel 2.6.18-194.8.1.0.1.el5
> ocfs2-tools-1.4.4-1.el5
> ocfs2-2.6.18-194.8.1.0.1.el5-1.4.7-1.el5
> ocfs2console-1.4.4-1.el5
>
> Help or suggestions appreciated.
>
> Thanks!
>
> -dan
> ______________________
> Dan Lark, RHCE
> Systems Engineer, Hargray Communications
> dan.lark at htc.hargray.com
> Office: 843-706-1819 | Cell: 843-227-2263
> 7 Arley Way, Suite 200 (2nd Floor)
> P.O. Box 3380
> Bluffton, SC 29910
>
>
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