How to identify disk in HP UX 11.31

[Ullas Simon]

Hi,

We have a HP 11.31 server which is connected to HP EVA SAN. Earlier in HP11.11 whenever we present a disk to server, we used to get the new disk(After IOSCAN) as C#t#d#. Now in HP UX11.31 how to identify a disk? Since this shows as disk1, disk2 but not the physical path. It is difficult to identify the disks of same size.

Will anybody help me out please???

[Torsten.]

There are a lot of ways:

# ioscan -m dsf

# ioscan -fNCdisk

# ioscan -m hwpath

...

and finally there is still "evainfo".

[Adam Winebaugh]

My ioscan is ioscan -funCdisk. Set an alias for the ioscan command to ioscan -funCdisk! It will make life much easier.

[Ramesh S]

Hi

And also, you wont find multiple Persistent DSF's for a single LUN which has alternate links.

Since it has native dynamic multipathing enabled.

There are lot of new features are available in 11iv3.

http://docs.hp.com/en/5991-6469/ch03s03.html

Best Regards,
Ramesh S

[Asif Sharif]

Hi Simon,

The output shows how to identify a disk in HP-UX 11.31 OS.

# strings /etc/lvmtab
/dev/vg00
/dev/disk/disk2 <--------Disk2
#
# ioscan -fnC disk
Class I H/W Path Driver S/W State H/W Type Description
=======================================================================
disk 1 0/0/2/0.0.0.0 sdisk CLAIMED DEVICE TEAC DV-28E-N
/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0
disk 0 0/1/1/1.2.0 sdisk CLAIMED DEVICE HP 73.4GST373207LC <--------Disk2
/dev/dsk/c3t2d0 /dev/rdsk/c3t2d0
# ioscan -m dsf
Persistent DSF Legacy DSF(s)
========================================
/dev/rdisk/disk2 /dev/rdsk/c3t2d0 <--------Disk2
/dev/rdisk/disk3 /dev/rdsk/c0t0d0

Regards,
Asif Sharif

[Sajjad Sahir]

Dear Ullas
u can use ioscan -funC disk
then u can see all categaries there
claimed and unclaimed
once u present a disk from an eva it is just uncliamed only
also u have to compare these ioscan output
with u strings /etc/lvmtab file also.

11. if u are presenting a disk from eva u are assinging lun number from eva itself also
u have to compare wiht this lun number with new disk but here it will be always not accurate. some times if u are assing lun 6 may be disk will get 5. so this method is not accurate.

thanks and regards
Sajjad

[Torsten.]

I disagree!

>> "u can use ioscan -funC disk
then u can see all categaries there
claimed and unclaimed"

With "-u" you will see only CLAIMED devices


>> "once u present a disk from an eva it is just uncliamed only"

No. The disk will be CLAIMED by the always installed driver.



>> "11. if u are presenting a disk from eva u are assinging lun number from eva itself also
u have to compare wiht this lun number with new disk but here it will be always not accurate. some times if u are assing lun 6 may be disk will get 5. so this method is not accurate."

Maybe in combination with another multipathing software, but the direct (legacy and new) hardware path will reflect the LUN number.




Any proceedings so far?

[Ullas Simon]

Thanks to all for the reply and support.

Yeah i could able to see the disk...

But can anyone explain how the disk number assigned.

Is this numer gets assigned randomly.

Thanks in advance.

[Torsten.]

randomly - this is something I guess when I see my ioscan output:

#ioscan -m dsf
Persistent DSF Legacy DSF(s)
========================================
/dev/rdisk/disk5 /dev/rdsk/c2t0d0
/dev/rdisk/disk6 /dev/rdsk/c3t2d0
/dev/rdisk/disk7 /dev/rdsk/c0t0d0
/dev/rdisk/disk32 /dev/rdsk/c2t1d0


So far I cannot see any relation ...