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JFS2 vs JFS

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costiles

costiles

Technical User
Jun 14, 2005
117
US
I had a system crash recently - so I took the oportunity - upon reestablishnment of box - to change the file system from jfs to jfs2. With all other constraints the same in every respect - I have seen much worse performance on the jfs2 file system. Anyone have any ideas why?
 
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More info:
How do you know performance is worse?
Which version of AIX, include ML number please?
Which file systems did you convert and how?
What applications access these file systems?

[morning] needcoffee
 
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The customer reports that the performance is much worse. The file system was a jfs - Universe is the database. The only thing that is different is that 2 disks failed at the same time in a mirrored environment - the disks were replaced - the old file system blown away and recreated as jfs2 - with defaults. In all other respects file system and logical volumes are exactly the same - including position on scsi disks.
 
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We'll try the question once again:
Which version of AIX, include ML number please?

Try posting the output of:
oslevel -r
oslevel -s

LVM in AIX has has plenty of highs and sadly a lot of lows, if you are on 5.2ML04 for instance then be prepared for trouble, upgrade the ML ASAP!
 
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Next question is both Aix and the database running in 64 bit mode. what does vmstat -v show.

Tony ... aka chgwhat

When in doubt,,, Power out...
 
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The kernel is not 64bit. I have scheduled a reboot for this weekend to regen the kernel to 64bit. Will let you know after that. Thanks for the input!
 
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JFS2 works much better on 64bit kernel!

I advice you to go back to JFS!

Regards,
Khalid
 
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Khalid - why would you not just goto 64bit kernel?
 
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I don't think that's what Khalid meant - I think he meant only until the change at the weekend.

I have been known to be wrong however!!

I want to be good, is that not enough?
 
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