Thanks for the tip, we currently use separate LUN's for data and logs. Matt.
-----Original Message----- From: Lane, Bob (Exchange) [mailto:[EMAIL PROTECTED] Sent: 04 November 2003 16:14 To: [EMAIL PROTECTED] Subject: Re: Linear Logging Performance Tuning - Unix MAtt I will tell you of an experience we had with EMC. You know that IBM recommends separation of Qmgr data & logs. Well, our engineering group had told us that this was not necessary with EMC due to caching and dual rotating controllers etc. When we were testing with MQ 53 on high performance Linux intel box we had some pretty miserable and incosistent results. So we decided to put the data & logs on separate LUNs of EMC. The performance numbers went way way up and were consistent. We found on Solaris that the testing on separate LUNs did not make as big a difference but this was old hardware sun box. -----Original Message----- From: Gurney, Matthew [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 04, 2003 3:16 AM To: [EMAIL PROTECTED] Subject: Linear Logging Performance Tuning - Unix > MQ 5.2 CSD7 > Solaris 5.8 > > I am trying to understand more about the parameters for linear logging, and what affects they have on Queue Manager performance. > > If you wanted to maximise Queue manager performance, what logging parameters would you choose in a situation where you have the following criteria: > * effectively unlimited disk space - a job runs every hour to delete unneeded log files, and we never come close to filling our quota of space > * hi performance SAN (EMC) > * linear logging > * queue Managers doing millions of messages per day > * all messages are persistent > * average message size 4k > * did not want to add any additional risk of message loss/data corruption ( I include this because I don't want to consider the LogWriteIntegrity Setting) > > LogPrimaryFiles= 62 <- this is a tricky one because for linear logging it's affect is not as obvious as for circular logging, I am going to suggest 62. > LogSecondaryFiles=1 < - again, this is a tricky on because for liner logging it's affect is not as obvious as for circular logging, I am going to suggest 1. > I have chosen 62 and 1 because the maximum number of log files is supposed to be 63. I am not sure if MQ will accept 63 and 0, does anyone know? > LogFilePages=16384 <- I think this is a real "tuning" parameter, ie it may not be best to have the maximum value, which means maximum log file size, for Solaris the maximum value here is 16384. I am going to suggest going for 16384 anyway. > LogType=LINEAR > LogBufferPages=512 <- I think this should be as large as possible, so I have gone for the max of 512 > > In summary I am suggesting going for the maximum value for all of the logging tuning parameters. I don't really know for sure if this is the best thing to do. Can anyone improve on my suggestions? > Does anyone have any input on this, or links to relevant documentation / support pacs / tuning guides? > As always any input is much appreciated. > Thanks, > Matt. > > ============================================================================ == This message is for the named person's use only. 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