high number of comm_waits for a TSM backup Post: 302440422

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Top Forums UNIX for Advanced & Expert Users high number of comm_waits for a TSM backup Post 302440422 by arizah on Tuesday 27th of July 2010 07:25:17 AM

07-27-2010

Registered User

high number of comm_waits for a TSM backup

Hi Guys,

I wonder if someone has come accross an issue where basically our db2 backups are running very slow and one thing that we can see from the TSM report below is that the number of comm_waits has increased dramatically. We asked the question to IBM about what comm_waits would means but according to them even the meaning is quite vague which I found a bit surprising. Please if anyone has a good idea of what the comm_waits means and what sort of actions we should follow to find the root cause of the slow backup. We are running aix 5.3 and tsm tdp client for the database backups. Thanks.

Code:

ENTITY                   COMM_WAIT          ST_DT        ST_TM                   Unnamed[5]              GB
------------------     -----------     ----------     --------     ------------------------     -----------
P01SCVI1_DB2                 21348     2010-07-05     23:00:25            0 06:07:44.000000             144
P01SCVI1_DB2                 21280     2010-07-05     23:01:24            0 06:06:45.000000             143
P01SCVI1_DB2                 15600     2010-07-06     23:00:47            0 04:36:30.000000             143
P01SCVI1_DB2                 15603     2010-07-06     23:01:27            0 04:35:51.000000             144
P01SCVI1_DB2                 18361     2010-07-07     23:01:17            0 05:13:13.000000             144
P01SCVI1_DB2                 18346     2010-07-07     23:01:27            0 05:13:03.000000             144
P01SCVI1_DB2                 19833     2010-07-08     23:01:08            0 05:45:32.000000             143
P01SCVI1_DB2                 19864     2010-07-08     23:01:17            0 05:45:23.000000             144
P01SCVI1_DB2                 20185     2010-07-09     23:00:55            0 05:46:38.000000             138
P01SCVI1_DB2                 20170     2010-07-09     23:01:10            0 05:46:23.000000             138
P01SCVI1_DB2                 18658     2010-07-10     23:00:40            0 05:27:10.000000             144
P01SCVI1_DB2                 18639     2010-07-10     23:01:10            0 05:26:40.000000             144
P01SCVI1_DB2                 18791     2010-07-11     23:00:19            0 05:27:38.000000             144
P01SCVI1_DB2                 18786     2010-07-11     23:01:04            0 05:26:53.000000             144
P01SCVI1_DB2                 20263     2010-07-12     23:01:00            0 05:43:29.000000             106
P01SCVI1_DB2                 20245     2010-07-12     23:01:15            0 05:43:14.000000             107
P01SCVI1_DB2                  2890     2010-07-13     05:00:40            0 02:09:59.000000             144
P01SCVI1_DB2                  2882     2010-07-13     05:00:46            0 02:09:53.000000             144
P01SCVI1_DB2                 14114     2010-07-13     23:01:06            0 04:02:15.000000             144
P01SCVI1_DB2                 14104     2010-07-13     23:01:15            0 04:02:04.000000             144
P01SCVI1_DB2                 12541     2010-07-14     23:01:09            0 03:57:05.000000             146
P01SCVI1_DB2                 12331     2010-07-14     23:01:21            0 03:56:54.000000             142
P01SCVI1_DB2                 20685     2010-07-15     23:00:30            0 05:53:01.000000             148
P01SCVI1_DB2                 20680     2010-07-15     23:01:23            0 05:52:08.000000             148

Last edited by pludi; 07-27-2010 at 08:50 AM.. Reason: code tags, please...

arizah

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