filesystem performance

[Marcin Wicinski]

hello,
I have 1GB VxFS filesystem. It is used by an apllication, which creates many small (xx - 2xx kB) files. We can divide the files into two groups:
- read/write files,
- read/write files with locking,
We cannot switch off filesystem logging.
The question is: what mounting options should be used to minimize reading/writing time.
We cannot use kernel params for tunning because they've been already optimized.

Thanks in advance.

[James R. Ferguson]

Hi Marcin:

Everything is a trade between performance and integrity. See Technical Knowledge Base document #KBRC00007737 for a good summary overview. Remember that Online JFS is required.

Regards!

...JRF...

[John Bolene · Accepted solution]

For VxFS filesystems with primarily random access, use mincache=direct, convosync=direct

For filesystems that you do not care about the data integrity in the event of a system failure, use tmplog or nolog, mincache=tmpcache, convosync=delay

Be sure you have Online JFS and look at the man pages for fsadm_vxfs and mount_vxfs.