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тАО11-20-2001 08:42 AM
тАО11-20-2001 08:42 AM
Optimal Parameters For JFS
Dear All
What are the optimal parameters for the JFS configuration in order an ORACLE DB OLTP and DSS system to operate?
Is there any way where the already defined parameters to changed?
Thanks a lot
What are the optimal parameters for the JFS configuration in order an ORACLE DB OLTP and DSS system to operate?
Is there any way where the already defined parameters to changed?
Thanks a lot
3 REPLIES 3
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тАО11-20-2001 10:33 AM
тАО11-20-2001 10:33 AM
Re: Optimal Parameters For JFS
Hi:
Here are the vxfs mount options I've found to be best for Oracle:
For Datafiles and Indices:
-o rw,suid,convosync=direct,mincache=direct,delaylog,nodatainlog
For archive logs and redo logs:
-o rw,suid,delaylog,nodatainlog
The convosync=direct,mincache=direct bypass the UNIX buffers - the performance is almost exactly the same as raw disk. If you use this option, you should reduce the UNIX buffer cache and use the memory to increase the SGA buffers.
I also find that turning off dynamic buffer cache by setting bufpages to a non-zero value
performs better. It is almost always pointless to exceed bufpages=80000 (320MB and this is very generous). If this is a pure Oracle server then bufpages=25600 (100MB is plenty).
Here are the vxfs mount options I've found to be best for Oracle:
For Datafiles and Indices:
-o rw,suid,convosync=direct,mincache=direct,delaylog,nodatainlog
For archive logs and redo logs:
-o rw,suid,delaylog,nodatainlog
The convosync=direct,mincache=direct bypass the UNIX buffers - the performance is almost exactly the same as raw disk. If you use this option, you should reduce the UNIX buffer cache and use the memory to increase the SGA buffers.
I also find that turning off dynamic buffer cache by setting bufpages to a non-zero value
performs better. It is almost always pointless to exceed bufpages=80000 (320MB and this is very generous). If this is a pure Oracle server then bufpages=25600 (100MB is plenty).
If it ain't broke, I can fix that.
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тАО11-20-2001 02:09 PM
тАО11-20-2001 02:09 PM
Re: Optimal Parameters For JFS
To add to Clay's list, use the dsync setting for rollback and temp files:
delaylog,mincache=dsync,convosync=dsync,nodatainlog
delaylog,mincache=dsync,convosync=dsync,nodatainlog
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тАО11-20-2001 06:28 PM
тАО11-20-2001 06:28 PM
Re: Optimal Parameters For JFS
Just a note in case you don't dfind these options in the man pages: they are part of Advanced JFS. Anyone running Oracle or other filesystem-based database should also have a copy of Advanced JFS (also known as Online JFS).
Bill Hassell, sysadmin
Bill Hassell, sysadmin
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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