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Tape Libraries and Drives
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Tape drives showing no_hw

mjos
Super Advisor

Tape drives showing no_hw

Hi,

I have an EML E series Library not sensing 4 tape drives out of the 12 drives. From the server end, the tape drives are showing as no_hw. This server is zoned to see the tape drives in the Library. The Library has three interface cards which is zoned & is attached to the cell server. From the cell server all the tape drives are showing as claimed.
The multipath option is selected in Data Protector & these backups run on SAN.
Please find below the ioscan output showing the 4 tape drives as no_hw

# ioscan -funC tape
Class I H/W Path Driver S/W State H/W Type Description
==================================================================
tape 10 1/0/4/1/0.12.161.255.0.0.0 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/10m /dev/rmt/10mn /dev/rmt/c75t0d0BEST /dev/rmt/c75t0d0BESTn
/dev/rmt/10mb /dev/rmt/10mnb /dev/rmt/c75t0d0BESTb /dev/rmt/c75t0d0BESTnb
tape 11 1/0/4/1/0.12.161.255.0.0.1 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/11m /dev/rmt/11mn /dev/rmt/c75t0d1BEST /dev/rmt/c75t0d1BESTn
/dev/rmt/11mb /dev/rmt/11mnb /dev/rmt/c75t0d1BESTb /dev/rmt/c75t0d1BESTnb
tape 18 1/0/4/1/0.12.162.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/18m /dev/rmt/18mn /dev/rmt/c77t0d0BEST /dev/rmt/c77t0d0BESTn
/dev/rmt/18mb /dev/rmt/18mnb /dev/rmt/c77t0d0BESTb /dev/rmt/c77t0d0BESTnb
tape 19 1/0/4/1/0.12.162.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/19m /dev/rmt/19mn /dev/rmt/c77t0d1BEST /dev/rmt/c77t0d1BESTn
/dev/rmt/19mb /dev/rmt/19mnb /dev/rmt/c77t0d1BESTb /dev/rmt/c77t0d1BESTnb
tape 0 1/0/4/1/0.12.167.255.0.0.0 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/0m /dev/rmt/0mn /dev/rmt/c72t0d0BEST /dev/rmt/c72t0d0BESTn
/dev/rmt/0mb /dev/rmt/0mnb /dev/rmt/c72t0d0BESTb /dev/rmt/c72t0d0BESTnb
tape 1 1/0/4/1/0.12.167.255.0.0.1 stape NO_HW DEVICE HP Ultrium 3-SCSI
/dev/rmt/1m /dev/rmt/1mn /dev/rmt/c72t0d1BEST /dev/rmt/c72t0d1BESTn
/dev/rmt/1mb /dev/rmt/1mnb /dev/rmt/c72t0d1BESTb /dev/rmt/c72t0d1BESTnb
tape 8 1/0/4/1/1.22.161.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/8m /dev/rmt/8mn /dev/rmt/c74t0d0BEST /dev/rmt/c74t0d0BESTn
/dev/rmt/8mb /dev/rmt/8mnb /dev/rmt/c74t0d0BESTb /dev/rmt/c74t0d0BESTnb
tape 9 1/0/4/1/1.22.161.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/9m /dev/rmt/9mn /dev/rmt/c74t0d1BEST /dev/rmt/c74t0d1BESTn
/dev/rmt/9mb /dev/rmt/9mnb /dev/rmt/c74t0d1BESTb /dev/rmt/c74t0d1BESTnb
tape 16 1/0/4/1/1.22.162.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/16m /dev/rmt/16mn /dev/rmt/c76t0d0BEST /dev/rmt/c76t0d0BESTn
/dev/rmt/16mb /dev/rmt/16mnb /dev/rmt/c76t0d0BESTb /dev/rmt/c76t0d0BESTnb
tape 17 1/0/4/1/1.22.162.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/17m /dev/rmt/17mn /dev/rmt/c76t0d1BEST /dev/rmt/c76t0d1BESTn
/dev/rmt/17mb /dev/rmt/17mnb /dev/rmt/c76t0d1BESTb /dev/rmt/c76t0d1BESTnb
tape 2 1/0/4/1/1.22.167.255.0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/2m /dev/rmt/2mn /dev/rmt/c73t0d0BEST /dev/rmt/c73t0d0BESTn
/dev/rmt/2mb /dev/rmt/2mnb /dev/rmt/c73t0d0BESTb /dev/rmt/c73t0d0BESTnb
tape 3 1/0/4/1/1.22.167.255.0.0.1 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/3m /dev/rmt/3mn /dev/rmt/c73t0d1BEST /dev/rmt/c73t0d1BESTn
/dev/rmt/3mb /dev/rmt/3mnb /dev/rmt/c73t0d1BESTb /dev/rmt/c73t0d1BESTnb
7 REPLIES
mjos
Super Advisor

Re: Tape drives showing no_hw

can somebody please help me what I should do so that these tape drives show up as claimed.
Vincent Farrugia
Honored Contributor

Re: Tape drives showing no_hw

Hello mjos,

I assume that you were working fine and suddenly you are not seeing 4 drives.

Any of these could be the culprit:

1) Rezoning of the configuration not including the link to the 4 drives.
2) FC cable connecting the drives faulty.
3) SFPs connecting the drives faulty.
4) 4 tape drives faulty (highly unlikely).

I would start by replacing the FC cable, then by replacing the SFP.

HTH,
Vince
Tape Drives RULE!!!
mjos
Super Advisor

Re: Tape drives showing no_hw

Is there any remapping that needs to be done from the server side once the interfaces are repalced on the library.
This issue came up only after the interfaces were changed on the library. Only some drives show up as no_hw.
Torsten.
Acclaimed Contributor

Re: Tape drives showing no_hw

NO_HW means the device was visible and currently it is not.

I would start with commandview tl and check the library for issues, if nothing found, check the switch.

Hope this helps!
Regards
Torsten.

__________________________________________________
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those who understand binary, and those who don't.

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mjos
Super Advisor

Re: Tape drives showing no_hw

Well everything looks fine on the CVTL. All the drives are online & also from the DP Cell server.
The issue is only on some of the servers which are zoned to see the tape drives.
Torsten.
Acclaimed Contributor

Re: Tape drives showing no_hw

Did you by chance changed the zoning on switches (or presentation in CV TL) to "hide" the drives from these servers?

Hope this helps!
Regards
Torsten.

__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.

__________________________________________________
No support by private messages. Please ask the forum!

If you feel this was helpful please click the KUDOS! thumb below!   
mjos
Super Advisor

Re: Tape drives showing no_hw

No.
I recollect reading somewhere in the forum that fc cleanup needs to be done when the server is not able to detect the drives. Is there any such command?