scsimgr to replace disk and tapes

[UnixT]

Hi All,

Can some one give me the steps to replace the fc attached disk and tapes in hp ux 11.31.

[Duncan Edmonstone]

This is all explained in this whitepaper:

http://docs.hp.com/en/scsimgr/scsimgr_whp_AR0803.pdf

See p28 onwards...

Remember you only need to do this hwne replacing an existing LUN/tape with a new one that has a diffrenet WWID

HTH

Duncan

[Raj D. · Accepted solution]

UnixT,

Example For Tape_Drive:


Once the tapedrive (Library tape drive) has been replaced do the following:

NOTE: ioscan will be still showing the tape drive status as NO_HW , and thats the problem.

#ioscan -fnC tape | grep stape
tape 16 0/0/4/1/0.14.6.255.0.0.2 stape NO_HW DEVICE HP Ultrium 2-SCSI



To do the following:

1. First look at dmesg or syslog for the "instance id".

---------------------------
class : lunpath, instance 78
Evpd inquiry page 83h/80h failed or the current page 83h/80h data do not match the previous known page 83h/80h data on LUN id 0x0 probed beneath the target path (class = tgtpath, instance = 7) The lun path is (class = lunpath, instance 78).Run 'scsimgr replace_wwid' command to validate the change
---------------------------


2. In this case there is "instance" number 78.
(Use the instance number found in dmesg or syslog in the next command)

a. Determine the hardware path of the lunpath

#scsimgr -p get_attr -C lunpath -I 78 -a hw_path
0/3/1/0.0x100000e00242d36c.0x1000000000000

(Now the lunpath is known and can be used in the following command)



b. Determine the hardware path of the replaced LUN

# ioscan -m hwpath -H 0/3/1/0.0x100000e00242d36c.0x1000000000000

Lun H/W Path Lunpath H/W Path Legacy H/W Path
====================================================================
64000/0xfa00/0x4e
0/3/1/0.0x100000e00242d36c.0x1000000000000
(Now that hardware path is known is used in next command)



c. Validate the replacement using the hardware path of the replaced LUN

#scsimgr -f replace_wwid -H 64000/0xfa00/0x4e
scsimgr: Successfully validated binding of LUN paths with new LUN.



d. Now, everything should be fine , as ioscan can see the tape drive: (CLAIMED)


#ioscan -fnC tape | grep stape
tape 16 0/0/4/1/0.14.6.255.0.0.2 stape CLAIMED DEVICE HP Ultrium 2-SCSI



Cheers,
Raj.