topic Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31 in Operating System - HP-UX

Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

aeronet — Wed, 21 Jul 2010 09:47:41 GMT

Hi,

I presented 28 LUNs and now the command insf don't add new /dev/dsk/cxtxdx devices, because the maximum c9 is reached. Does a kernel parameter exist for this maximum?

Thanks

Andre

Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

Michal Kapalka (mikap) — Wed, 21 Jul 2010 09:59:33 GMT

hi,

my opinion is to reboot the server if its possible, and check if all special files was created during the boot.

mikap

Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

aeronet — Wed, 21 Jul 2010 10:00:34 GMT

Ok, it was my mistake. It had nothing to do with the described problem.

Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

Raj D. — Wed, 21 Jul 2010 10:05:28 GMT

Andre,
In 11.31 /dev/dsk/ limitations and problems has been resolved with /dev/disk/ format, why not to use agile addressing.

How # ioscan -fnNC disk looks like
Also # ioscan -m dsf

Try to Provide more details .

Also check this out:
http://docs.hp.com/en/dsfmigration/persistent_dsf_migration.pdf

Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

aeronet — Wed, 21 Jul 2010 11:44:28 GMT

Raj,
the Problem was the following. I presented 2 new LUNs from the EVA4400. HP-UX placed the two LUNs (4 Paths per LUN) in one of the permanent /dev/disk/diskXXX special devices and mean /dev/disk/diskXXX has eight paths for whatever reason.

After a reboot the problem was solved. The second /dev/disk/diskXXX was created. It's seems to be a bug in HP-UX 11.31.

Thanks for all the posts.

Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

Torsten. — Wed, 21 Jul 2010 11:47:32 GMT

Bug or not, it always creates problems if you present EVA LUNs in any other than hp-ux mode.

Check this again.

Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

aeronet — Wed, 21 Jul 2010 11:53:58 GMT

All hosts are in the HP-UX mode on the EVA.
Cheers,
Andre

Re: Maximum of /dev/dsk/cXtXdX reached? HP-UX 11.31

chris huys_4 — Wed, 21 Jul 2010 12:37:44 GMT

Hi,

> After a reboot the problem was solved. The
> second /dev/disk/diskXXX was created. It's
> seems to be a bug in HP-UX 11.31.

Its not a bug. It is what happens if a lun with wwid X first gets assigned to lun id Y, then the lun with wwid X gets deleted and a lun with wwid Z, gets assigned to the same lun id Y.

Greetz,
Chris