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тАО11-20-2001 04:50 AM
тАО11-20-2001 04:50 AM
The above are True? Are there any problem in the perfromance?
My configuration is a V CLass 8Process/8GB Memory, FC10 over HUB.
Solved! Go to Solution.
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тАО11-20-2001 05:12 AM
тАО11-20-2001 05:12 AM
Re: ORACLE, JFS, and FC10 array
hi, what command/output are you using to determine this?? Please note that the "fragment size" displayed by df -g is
the actual block size. This can also be seen with the fsadm command.
HTH
raj
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тАО11-20-2001 05:16 AM
тАО11-20-2001 05:16 AM
Re: ORACLE, JFS, and FC10 array
mkfs -m /dev/vgXX/lvolYY
And look at the bsize value.
Don't worry aboyt what VxfS is doing behind the scenes, or about the FC packet payload size. Just make sure FS Block size=Oracle block size
If you have Online JFS and the server is an Oracle DB server only, you can also tune file system buffer caching to a nice low value:
Set dbc_max_pct and dbc_min_pct to low value (e.g. 5 for both)
Disable file system buffer caching for the VxFS file systems by mounting with options 'mincache=direct,convosync=direct'
Increase the size of your Oracle buffer cache to take advantage of the freed up memory.
HTH
Duncan
I am an HPE Employee
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тАО11-20-2001 06:41 AM
тАО11-20-2001 06:41 AM
Re: ORACLE, JFS, and FC10 array
Just forget about the chunks and stuff.
Set your OS blocksize to 8k and the Oracle block size to the same value. That will do perfect. We run these values on a V2500 with an EMC Symmetrix with FC interfaces without performance problems.
Your db_block_buffers value depends on the size of the database and the user activity.
You can check it, if you go for the library cache hit ratio ( Oracle Enterprise Manager / Performance Manager ).
Rgds
Alexander M. Ermes
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тАО11-20-2001 07:15 AM
тАО11-20-2001 07:15 AM
Re: ORACLE, JFS, and FC10 array
I run the command
fstyp -v /dev/vg01/mnt1a and the output was:
vxfs
version:3
f_bsize:8192
f_frsize:2048
What is f_bsize and f_frsize ?
Which one corresponds to the block size?
Can I change the block size?
Thanks
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тАО11-20-2001 07:16 AM
тАО11-20-2001 07:16 AM
Re: ORACLE, JFS, and FC10 array
Thanks a lot
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тАО11-20-2001 07:33 AM
тАО11-20-2001 07:33 AM
SolutionNo you can't change the block size unless you re-create the file system.
THe mount options for file systems in ServiceGuard go in your package control script, these should be in a sub-directory under /etc/cmcluster (if your not sure which use cmgetconf to determine which is your package control script). FInd the lines that look something like this:
LV[0]="/dev/vgXX/lvolYY"; FS[0]="/u01"; FS_MOUNT_OPT[0]=""
LV[1]="/dev/vgXX/lvolYY"; FS[1]="/u02"; FS_MOUNT_OPT[1]=""
and change the FS_MOUNT_OPT parameters to match the options you want... e.g.
FS_MOUNT_OPT[0]="-o largefiles,mincache=direct,convosync=direct"
HTH
Duncan
I am an HPE Employee
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тАО11-20-2001 07:34 AM
тАО11-20-2001 07:34 AM
Re: ORACLE, JFS, and FC10 array
I am an HPE Employee