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IOSCAN shows CLAIMED for unmaped disks from the server.

 
pgaidai
Occasional Contributor

IOSCAN shows CLAIMED for unmaped disks from the server.

Hello everybody!
LUNs from Clariion 700 are presented to the server with HP-UX 11.23.
I have one little problem with unmapping disks. 

I make ioscan several times and restart NaviCli, but 

PowerPath shows: 

Logical device ID=60060160101916004DC59EB1DB8ADD11 
state=alive; policy=CLAROpt; priority=0; queued-IOs=0
Owner: default=SP B, current=SP B
==============================================================================
---------------- Host ---------------   - Stor -   -- I/O Path -  -- Stats ---
###  HW Path                I/O Paths    Interf.   Mode    State  Q-IOs Errors
==============================================================================
  71 0/2/1/0.1.0.239.0.0.0     c71t0d0   SP B3     active  dead       0      1
  72 0/2/1/0.1.1.239.0.0.0     c72t0d0   SP A2     active  dead       0      1
  73 0/2/1/0.1.2.239.0.0.0     c73t0d0   SP B1     active  dead       0      1
  74 0/2/1/0.1.3.239.0.0.0     c74t0d0   SP A0     active  dead       0      1
  75 0/5/1/0.2.2.239.0.0.0     c75t0d0   SP B0     active  dead       0      1
  76 0/5/1/0.2.3.239.0.0.0     c76t0d0   SP A1     active  dead       0      1
  77 0/5/1/0.2.4.239.0.0.0     c77t0d0   SP B2     active  dead       0      1
  78 0/5/1/0.2.5.239.0.0.0     c78t0d0   SP A3     active  dead       0      1

  
#ioscan -funCdisk

disk    268  0/2/1/0.1.0.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
                            /dev/dsk/c71t0d0   /dev/rdsk/c71t0d0
disk    282  0/2/1/0.1.1.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
                            /dev/dsk/c72t0d0   /dev/rdsk/c72t0d0
disk    267  0/2/1/0.1.2.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
                            /dev/dsk/c73t0d0   /dev/rdsk/c73t0d0
disk    283  0/2/1/0.1.3.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
							/dev/dsk/c74t0d0   /dev/rdsk/c74t0d0
disk    285  0/5/1/0.2.2.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
                            /dev/dsk/c75t0d0   /dev/rdsk/c75t0d0
disk    286  0/5/1/0.2.3.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
                            /dev/dsk/c76t0d0   /dev/rdsk/c76t0d0
disk    293  0/5/1/0.2.4.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
                            /dev/dsk/c77t0d0   /dev/rdsk/c77t0d0
disk    272  0/5/1/0.2.5.239.0.0.0   sdisk      CLAIMED     DEVICE       DGC     CX700WDUNB
                            /dev/dsk/c78t0d0   /dev/rdsk/c78t0d0

							
# diskinfo /dev/rdsk/c78t0d0
diskinfo: can't SIOC_INQUIRY /dev/rdsk/c78t0d0: I/O error

What's wrong ?

 

3 REPLIES
Torsten.
Acclaimed Contributor

Re: IOSCAN shows CLAIMED for unmaped disks from the server.

You have obviously special multipath software installed. This creates "pseudo" devices instead of the physical devices. These virual devices are still CLAIMED, even if the physical devices are no longer there.

Hope this helps!
Regards
Torsten.

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pgaidai
Occasional Contributor

Re: IOSCAN shows CLAIMED for unmaped disks from the server.

PowerPath in HP-UX 11.23 doesn't create  pseudo devicses

Matti_Kurkela
Honored Contributor

Re: IOSCAN shows CLAIMED for unmaped disks from the server.

You're using the '-u' option in ioscan: it skips the actual hardware probe, so the results may not be accurate. Try without that option:

ioscan -fnCdisk

 It may take somewhat longer, but it will give you the most up-to-date information.

 

In HP-UX 11.23 and older, I understand PowerPath essentially wedges itself somewhere in the middle of the HP-UX SCSI driver stack, causing the devices to automagically load-balance between all the available paths, sort of like what 11.31 does with legacy device nodes when the "leg_mpath_enable" is set to 1.

 

Since you know the paths are dead, you should follow EMC documented procedure for removing PowerPath-managed devices on HP-UX.

 

First remove the dead paths using their Hardware Paths:

rmsf -a -H 0/2/1/0.1.0.239.0.0.0
[...etc...]

 

Then run:

powermt check

PowerPath should tell you if it finds dead paths, and ask you if those devices should be removed.

Answering "y" or "a" (= yes to all) should remove the dead paths.

 

Finally, you should run:

powermt config
MK