Potkay, Peter M (CTO Architecture + Engineering)
2013-09-16 12:05:53 UTC
We ended up going with a separate SAN mount to our virtual server that will be dedicated for the /var/mqm/log dir. It will have its own virtual SCSI adapter, to increase the chance of getting the best I/O possible. Although with dozens of other unrelated virtual servers each with their own vSCSIs all competing for the relatively few physical paths off the physical host to the SAN, there is no guarantee the 2nd vSCSI will improve the I/O performance of our one particular MQ virtual server at all times.
In documenting how I want the Server Admins to configure/var/mqm and /var/mqm/log before turning the server over to us for the MQ install, I see in the Infocenter (direct link below) that while it calls out the directory ownership (owned by the user mqm in the group mqm), it doesn't say anything about what the directory permissions should be.
http://pic.dhe.ibm.com/infocenter/wmqv7/v7r5/topic/com.ibm.mq.ins.doc/q008510_.htm
Do we:
A. Ask for chmod 775?
B. Doesn't matter what the permissions are ahead of time as long as the ownership is mqm:mqm, because the WMQ install process will the straighten out the permissions on /var/mqm/log?
C. Some other permissions?
I suggested A to our Sys Admin, he asked if I really meant chmod 2775 and that's when I got a blank stare, started breathing through my mouth and said I'll be right back.
This Technote had a lot of info about permissions, but doesn't answer my question specifically.
http://www-01.ibm.com/support/docview.wss?uid=swg21446338
When building /var/mqm and /var/mqm/log filesystems ahead of an MQ install, what permissions should we set?
Peter Potkay
-----Original Message-----
From: MQSeries List [mailto:MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org] On Behalf Of Andy Hickson
Sent: Thursday, July 25, 2013 3:01 AM
To: MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org
Subject: Re: Seperate File Systems for logs and queues - on virtual Linux servers too?
Peter,
Although using circular logs puts an upper bound on the amount of log space needed for the logs, it doesn't imply that additional logs won't be required.
If the event that a secondary log extent needs to be allocated it would be important for queue manager availability (but not message integrity) that space exists in which the log can be created.
Regards
Andy.
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In documenting how I want the Server Admins to configure/var/mqm and /var/mqm/log before turning the server over to us for the MQ install, I see in the Infocenter (direct link below) that while it calls out the directory ownership (owned by the user mqm in the group mqm), it doesn't say anything about what the directory permissions should be.
http://pic.dhe.ibm.com/infocenter/wmqv7/v7r5/topic/com.ibm.mq.ins.doc/q008510_.htm
Do we:
A. Ask for chmod 775?
B. Doesn't matter what the permissions are ahead of time as long as the ownership is mqm:mqm, because the WMQ install process will the straighten out the permissions on /var/mqm/log?
C. Some other permissions?
I suggested A to our Sys Admin, he asked if I really meant chmod 2775 and that's when I got a blank stare, started breathing through my mouth and said I'll be right back.
This Technote had a lot of info about permissions, but doesn't answer my question specifically.
http://www-01.ibm.com/support/docview.wss?uid=swg21446338
When building /var/mqm and /var/mqm/log filesystems ahead of an MQ install, what permissions should we set?
Peter Potkay
-----Original Message-----
From: MQSeries List [mailto:MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org] On Behalf Of Andy Hickson
Sent: Thursday, July 25, 2013 3:01 AM
To: MQSERIES-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org
Subject: Re: Seperate File Systems for logs and queues - on virtual Linux servers too?
Peter,
Although using circular logs puts an upper bound on the amount of log space needed for the logs, it doesn't imply that additional logs won't be required.
If the event that a secondary log extent needs to be allocated it would be important for queue manager availability (but not message integrity) that space exists in which the log can be created.
From a performance tuning perspective it is also very useful to be able to monitor the relative activity to the queue manager data and to the recovery logs.
For these reasons I would still recommend the typical use of three file systems for production MQ deployment.Regards
Andy.
To unsubscribe, write to LISTSERV-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org and, in the message body (not the subject), write: SIGNOFF MQSERIES Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com
Archive: http://listserv.meduniwien.ac.at/archives/mqser-l.html
************************************************************
This communication, including attachments, is for the exclusive use of addressee and may contain proprietary, confidential and/or privileged information. If you are not the intended recipient, any use, copying, disclosure, dissemination or distribution is strictly prohibited. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this communication and destroy all copies.
************************************************************
To unsubscribe, write to LISTSERV-0lvw86wZMd9k/bWDasg6f+***@public.gmane.org and,
in the message body (not the subject), write: SIGNOFF MQSERIES