topic Re: Proper way to remove any non used devices in Operating System - HP-UX

Proper way to remove any non used devices

susan.derose — Tue, 04 Nov 2008 03:35:17 GMT

Hi guys,
I am not sure how to properly remove a storage attached disk to my hp-ux 11.31v. Can someone please give me a quick run down on how to do this?

These are the things I had in mind but do not know the correct flags to use.

1. identify the disk -
ioscan -funC disk
2. make sure it is not used -
pvdisplay -v /dev/disk/disk909
3. remove it.
rmfs -x disk909
4. verify that it is removed. -
ioscan -funC disk

Any suggestions will be greatly appreciated.
Is the rmfs -x the only proper way to remove it? I think I read somewhere that you should not be doing an "rm" under /dev/disk/ ...

Re: Proper way to remove any non used devices

Johnson Punniyalingam — Tue, 04 Nov 2008 05:16:16 GMT

>> am not sure how to properly remove a storage attached disk to my hp-ux 11.31v<<

rmfs -x disk909 ..? (never used before)

(rmfs Command
Purpose
Removes a file system)

are your storage disk configured to any of your volume group in your server "hp-ux 11.31v" ...?

if you need to vgreduce /dev/vg00 /dev/dsk/cxtxdx

once you de-attached the "storage from your server"
mv /etc/lvmtab /etc/lvmtab.sav
vgscan -a
This will recreate you lvmtab
strings /etc/lvmtab
vgdisplay -v |more
(check for PV available in all your volume_group)

insf -e
ioscan -fnC disk --> this should show only the currenlty used disk in your server

Thanks,
Johnson

Re: Proper way to remove any non used devices

SKR_1 — Tue, 04 Nov 2008 05:27:08 GMT

I think its not rmfs. It should be rmsf.

This is good choice.

Thanks

SKR

Re: Proper way to remove any non used devices

Adam W. — Tue, 04 Nov 2008 14:06:31 GMT

rmsf is th command needed here followed by an insf -e.

Man rmsf for more info or go to this link.

http://docs.hp.com/en/5992-3373/ch09s06.html

Re: Proper way to remove any non used devices

susan.derose — Thu, 06 Nov 2008 14:19:22 GMT

Hi guys,

Yes I did mean rmsf and not rmfs.
Thanks again guys.

Re: Proper way to remove any non used devices

Sharma Sanjeev — Fri, 07 Nov 2008 14:54:15 GMT

Hi

Please use rmsf -H

it will delete both rdsk and dsk device files

Only rmsf /dev/dsk will remove /dsk files
Regards
Sanjeev

Re: Proper way to remove any non used devices

Sagar Sirdesai — Wed, 12 Nov 2008 09:26:04 GMT

Hi

I would recommend using rmsf -H command to delete it

Re: Proper way to remove any non used devices

Torsten. — Wed, 12 Nov 2008 09:39:23 GMT

I don't remember where I read this, but in fact after you do a rmsf in 11.31, the system will re-run insf again on it's own.

My example:

> ioscan -fnH 0/1/1/1.2.0
Class I H/W Path Driver S/W State H/W Type Description
=====================================================================
disk 2 0/1/1/1.2.0 sdisk CLAIMED DEVICE HP 36.4GMAS3367NC
/dev/dsk/c3t2d0 /dev/rdsk/c3t2d0
/dev/dsk/c3t2d0s1 /dev/rdsk/c3t2d0s1
/dev/dsk/c3t2d0s2 /dev/rdsk/c3t2d0s2
/dev/dsk/c3t2d0s3 /dev/rdsk/c3t2d0s3
/dev/dsk/c3t2d0s4 /dev/rdsk/c3t2d0s4

> rmsf -H 0/1/1/1.2.0

> ioscan -fnH 0/1/1/1.2.0
(same output)

> ll /dev/dsk/c3t2*
brw-r----- 1 bin sys 31 0x032000 Nov 12 12:34 /dev/dsk/c3t2d0
brw-r----- 1 bin sys 31 0x032001 Nov 12 12:34 /dev/dsk/c3t2d0s1
brw-r----- 1 bin sys 31 0x032002 Nov 12 12:34 /dev/dsk/c3t2d0s2
brw-r----- 1 bin sys 31 0x032003 Nov 12 12:34 /dev/dsk/c3t2d0s3
brw-r----- 1 bin sys 31 0x032004 Nov 12 12:34 /dev/dsk/c3t2d0s4

> date
Wed Nov 12 12:35:12 MEZ 2008

SYSLOG:

Nov 12 12:34:05 myserver sfd[2254]: started 'insf' to create device special file
s for newly found devices.
Nov 12 12:34:16 myserver sfd[2254]: execution of 'insf' completed.

Re: Proper way to remove any non used devices

James R. Ferguson — Wed, 12 Nov 2008 14:00:13 GMT

Hi:

> Torsten: ...after you do a rmsf in 11.31, the system will re-run insf again on it's own.

The way I read your test data is that the device files are regenerated as a consequence of running 'ioscan'. I would further suspect that if you ran it with the '-k' option to consult only the kernel tables, you would not see the device file(s) regenerated.

Regards!

...JRF...

Re: Proper way to remove any non used devices

Torsten. — Thu, 13 Nov 2008 06:31:34 GMT

JRF you are absolutely right.

"rmsf" did remove the legacy device files, the agile will stay.

ioscan with "-k" will not show the disk at all (only a target, but not the disk), without "-k" the legacy device files are re-created.

So an "ioscan -fnCdisk" is *not* a good test to see if the device files are removed.

;-)

Re: Proper way to remove any non used devices

susan.derose — Mon, 24 Nov 2008 20:47:51 GMT

Torsten,

So what is a good way to check to make sure that all the associated device files are removed correctly under 11.31?

Susan

Re: Proper way to remove any non used devices

yulianto piyut — Thu, 27 Nov 2008 04:39:41 GMT

maybe you can run ioscan -nfCdisk and make sure to SAN administrator to unmap or unzone the LUN that have been recently removed from the server.

Re: Proper way to remove any non used devices

susan.derose — Wed, 10 Dec 2008 22:22:55 GMT

Thank you.