topic Re: resized LUN but diskinfo shows old size in Operating System - HP-UX

resized LUN but diskinfo shows old size

Denver Osborn — Wed, 30 Mar 2005 07:54:26 GMT

Hi all,

I've got an hpux 11.11 box w/ fabric attached VA7100. One of the LUNs was resized from 9GB to 2GB, but diskinfo still reports it as 9GB. It looks to me like the driver has the info cached somewhere. Any suggestions on how I might correct this problem without bouncing the box?

Yes, the LUN is 2GB now... armdsp shows the correct info.

I also saw there was a SCSI patch for a similar issue back w/ 10.20 and 11.0, so I'd hope the problem fix was included when 11.11 rolled out.

Thanks,
-denver

Re: resized LUN but diskinfo shows old size

Florian Heigl (new acc) — Wed, 30 Mar 2005 08:09:26 GMT

A few weeks ago I read a statement by S. Potter, who said he only *once* managed to get a LUN size change noted.

Our standard procedure also always is based on adding a LUN of the new size and pvmove'ing.

Unless someone knows the trick, I'd recommend You to go back to 9GB size (for safety in case LVM still assumes extents there) and adding another LUN + moving the data with pvmove, or maybe even mirroring it for a moment. afterwards You can throw out the 9GB lun. This will work online, the only critical point is what happens, when the PE's >2GB are being accessed, but I'd say that the risk isn't too high.

If You're in doubt, let hp look over the LUN with the lvmux11 utility.

Re: resized LUN but diskinfo shows old size

Denver Osborn — Wed, 30 Mar 2005 08:16:02 GMT

let me add that this disk is not in use by the system, there's no data on it and it's not an LVM disk.

A few nodes have access to the LUN. One node's diskinfo shows the LUN as 2GB, while another shows 9GB. I think the admin resizing the lun did diskinfo prior to resizing. So it would make sense that the idle box showed the new 2GB size -vs- 9GB because it actually queried instead of pulling from cache. Does this make sens?

Any how, I'm hoping someone might know a way it can be cleaned up without a reboot.

Re: resized LUN but diskinfo shows old size

Uday_S_Ankolekar — Wed, 30 Mar 2005 09:11:45 GMT

I thought lun can not be resized once created.
Delete the the lun completely and recreate it with desired size.
I will create new lun and move data to new lun and delete the old one.

-USA..

Re: resized LUN but diskinfo shows old size

Patrick Wallek — Wed, 30 Mar 2005 09:14:35 GMT

Have you tried removing the rmsf'ing the device file and the insf'ing to recreate it?

I ran into something similar when I deleted a LUN and then recreated it at a smaller sizeon a VA7400. I can't remember what I did to solve the problem though.

Re: resized LUN but diskinfo shows old size

Denver Osborn — Wed, 30 Mar 2005 09:22:44 GMT

sorry, the lun wasn't "resized" it was deleted then created with with the newer size...

I've tried rmsf, ioscan, insf and nothing seems to do it.

rmsf -k -H hw_path (and rmsf -a /dev/rdsk/cxtxdx)
ioscan
insf -e

Re: resized LUN but diskinfo shows old size

Geoff Wild — Wed, 30 Mar 2005 09:27:01 GMT

If you have rmsf'd, ioscan -fnC disk, and insf -e -C disk - and it still shows as 9gb? well, are you positive you are looking at the same disk?

Rgds...Geoff

Re: resized LUN but diskinfo shows old size

Steven E. Protter — Wed, 30 Mar 2005 09:29:30 GMT

I've had constant problems in this arena, and as noted only once got a box to recognize increased space without a boot. I do not know what I did special to make that happen.

Unfortuneately, the only process I know works involves destructive removal of the logical volume.

lvremove
vgreduce
pvcreate
vgextend

This problem generally occurs with non-HP disk arrays.

SEP

Re: resized LUN but diskinfo shows old size

Denver Osborn — Wed, 30 Mar 2005 09:41:39 GMT

yes, I know it's the same disk :)

I'm working on a passive node and just tried

rmsf -k -H 0/4/0/0
ioscan
insf -e

and again I've got nuthin...

I really was hoping not to bounce the box for this. Maybe I'll try one last time to remove and recreate the LUN.

Re: resized LUN but diskinfo shows old size

Patrick Wallek — Wed, 30 Mar 2005 09:44:54 GMT

Denver,

What about --

1) Remove LUN from VA
2) Run diskinfo on non-existant LUN. You *should* get an error.
3) rmsf device files
4) recreate LUN
5) ioscan and insf to recreate device files
6) run diskinfo again.

If the info is cached somewherre maybe running the diskinfo and having it error (hopefully) will clear that.

Re: resized LUN but diskinfo shows old size

Florian Heigl (new acc) — Wed, 30 Mar 2005 09:45:14 GMT

Denver - ok, good to hear there was no data on it :)

I don't know why this is happening, but I'm afraid that the disk won't be rescanned before You remove it again on the VA, and then remove the special files and wait for the kernel to drop it from ioscan.

Short of a reboot (and that shouldn't be neccessary), I can't tell for sure, even when scratching my head.

I've not yet seen diskinfo lying to me in such situations.

the patches interesting would be both scsi and 'ioscan performance' and the likes.

Re: resized LUN but diskinfo shows old size

Denver Osborn — Wed, 30 Mar 2005 10:00:12 GMT

Thanks for the thought Patrick

I tried...

removing the lun
ioscan
diskinfo (still resturned info for removed lun)
rmsf -k -H hw_path
ioscan
diskinfo --> failed
created lun
ioscan
insf
diskinfo --> 9GB. doh!

Maybe I forgot to blink 3 times and clap my hands before running the last ioscan.

It's about time to call HP so the RC can tell me to install a patch that will require a reboot and magically fix my problem. :)

-denver

Re: resized LUN but diskinfo shows old size

Geoff Wild — Wed, 30 Mar 2005 11:47:51 GMT

Yes - I would call HP - doesn't make any sense - this isn't Windoze after all - a reboot should not be required :0

What about this - can you leave that LUN there - then create a new LUN of 2 gb's - and check it with diskinfo?

Then remove the old one (and devs, etc...).

Rgds...Geoff

Re: resized LUN but diskinfo shows old size

Denver Osborn — Wed, 30 Mar 2005 13:29:26 GMT

I've heard from HP about this and the short answer was to reboot to clear it up.

Re: resized LUN but diskinfo shows old size

Patrick Wallek — Wed, 30 Mar 2005 14:27:05 GMT

Denver,

Off topic -- Just curious....Have you changed jobs? You used to work in the HP RC didn't you?

No points please.

Re: resized LUN but diskinfo shows old size

Denver Osborn — Wed, 30 Mar 2005 14:32:49 GMT

Hey Patrick,

You're right. I left the response center Sept 2003 in favor of being a full time SysAdmin in St Louis.

-denver

Re: resized LUN but diskinfo shows old size

Peyman Javaheri — Thu, 31 Mar 2005 14:58:48 GMT

Hi,

I came across this problem several months ago, and unfortunately reboot was the only option. When you recreate a lun with the same name as a previous one or resize it diskinfo will only use the cached info from the last reboot. Please update this thread if you find a way to do this without reboot.

thanks,
peyman;

Re: resized LUN but diskinfo shows old size

Denver Osborn — Thu, 31 Mar 2005 15:46:01 GMT

I haven't been able to bounce the box yet and had one interesting thing to note.

1 of the 3 nodes w/ access to the same LUN doesn't have this problem. I can delete and recreate the lun as a different size and the one node sees the correct size immediatley, no ioscan or insf or reboot needed. Strange thing is that the good node was cloned from one of the problem nodes... and they're at the same patch revs. The only difference is the way the connect to the fabric.

problem nodes attach have to fc hba's, each hba is connected to a seperate fc switch. Each one of the va's controllers is also connected to each one of the switches. There's an isl between the 2 switches. The "good" node is connected via a 3rd switch that has an isl to the other 2 switches. Theses fc swaitches are brocade 2800's at f/w 2.6.2a.

Anyone have any other ideas here?

Re: resized LUN but diskinfo shows old size

Bob_Vance — Thu, 31 Mar 2005 17:59:11 GMT

Interesting.
I've not had problems with this.

I just tested on 11.11 and VA7110.
Created 2.3GB LUN 501.
ioscan
insf -e
diskinfo reports 2.3GB.
Deleted the LUN.
diskinfo *reports an error*, as I would expect.
Created 4.3GB LUN 501.
diskinfo immediately reports 4.3GB
Deleted the LUN.
Created 1.3GB LUN 501.
diskinfo immediately reports 1.3GB
Deleted the LUN.
diskinfo reports an error

My systems are also dual-attached thru 2 fabrics.
No problems at all.
However, I *am* patched up to date with *all* patches.
Also, mine are VA7110's, not VA7100's.

bv

Re: resized LUN but diskinfo shows old size

Peyman Javaheri — Thu, 31 Mar 2005 18:22:02 GMT

Sorry...I take my answer back. You are using VA7100. I was working on an EVA.

And I was thinking you cannot resize a 7100 lun. Because of that I was always removing the lun and recreating it with the new size, which never gave me any trouble. (whith exception of fabric login)

regards,
peyman;