mount option vxfs delaylog

[Rammig Claus]

Where do I find more information about affected systemcalls for this option. The manpage only shows "some systemcalls ..."

[Stefan Farrelly]

www.docs.hp.com
search for delaylog and vxfs.

[Rammig Claus]

All I found in www.docs.hp.com about delaylog is, that "some systemcalls return before the intentlog is written".

My Question: What is the meaning of "SOME SYSTEMCALLS"

[Dietmar Konermann · Accepted solution]

It's not easy to say exactly what syscalls are affected. Of course, attribute changing syscalls like chown(2), chmod(2) are always delayed with delaylog.

For other syscall it may be important under what circumstances they are used... as a rule of thumb one can say that "less important" inode updates are not logged synchronously.

Example: when writing to a file, timestamps need to be updated... from a performance point of view it could be a disaster to log these updates synchonously to the intent log... so the logs are delayed.

Best regards...
Dietmar.