From: RS/6000 AIX (aixgeek@YAHOO.COM)
Date: Thu Sep 26 2002 - 21:12:35 EDT
Even more specifically, it depends on how many file
system metadata changes you make, NOT the number of
data writes you make.
If you have a file system that has one big file in it
that NEVER changes size (but has blocks within the
file continually updated), you'll have virtually no
jfslog writes.
If someone has the time and/or inclination -- set this
up and do some writes, and use filemon to track the
jfslog activity.
--- Bill Verzal <Bill_Verzal@BCBSIL.COM> wrote:
> Use standard JFS log sizes unless you see JFS Log
> overrun errors in the
> errorlog.
>
> You can have a 2GB filesystem that get written to
> 100x per day and that
> wont overrun the jfslog, but you can have a 30MB
> filesystem that gets
> written to a gazillion times per day and that might
> overrun the jfslog. It
> is not as dependent on filesystem size, as it is on
> activity.
>
> BV
>
--------------------------------------------------------------------------------------------------------
>
> Bill Verzal
> Technical Consultant
> Forbes Technical Consulting
> (312) 653-3684
> bill_verzal@bcbsil.com
> MailStop: 27.202B
>
>
>
> glh@DAIRYNET.C
> OM To:
> aix-l@Princeton.EDU
> Sent by: "IBM cc:
> AIX Discussion Subject:
> JFS Log Sizing
> List"
> <aix-l@Princet
> on.EDU>
>
>
> 09/25/2002
> 08:24 AM
> Please respond
> to "IBM AIX
> Discussion
> List"
>
>
>
>
>
>
> Are there any AIX guidelines regarding the proper
> sizing of JFS logs. I
> have a note that says a 4 MB jfslog is required for
> every 2 GB file system.
> Is this correct?
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