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Informix KAIO problems

Rich Wright
Trusted Contributor

Informix KAIO problems

V2500, HPUX 11.0 64bit, Informix 7.31.FC4 64bit. OmniBack 3.1
Has anyone successfully implemented KAIO.
We tried once. Got "kaio_READ" errors. Informix said to increase maxfiles & maxfiles_lim.
We increased both from 2048 to 10000.
Now we are getting "kaio_WRITE" errors.
Informix performance has improved, but the OmniBack backups of the Logical Logs are failing and causing the above errors.

Thanks in advance,
Rich
2 REPLIES
Denver Osborn
Honored Contributor

Re: Informix KAIO problems

Do you have the kernel driver asyncdsk in the kernel and the /dev/async device file created?

Open SAM -> Kernel configuration -> drivers; look to see if asyncdsk is in or out. If it is out add it to ther kernel and reboot. Then you'll have to mknod the /dev/async device file.

mknod /dev/async c 101 0x000000
Rich Wright
Trusted Contributor

Re: Informix KAIO problems

The kernel driver was installed and the
/dev/async special file was created.
Instead of
mknod /dev/async c 101 0x000000
we used
mknod /dev/async c 101 0x000004
per Informix instructions.
To clear (or not) things a little. Everything was working perfectly until usage started getting high.