Luns not showing up

[ramesh rajan]

Hardware RP4440
Storage Array: Hitachi Tagmastore USP600
SAN Switches: Brocade
HBA : HP Tachyon Cards /dev/td
Multipathing Software : HDLM
Operating System: HP-UX 11.11


This host is attached to SAN fibre channel network and had 10 Luns/disks added to it from the USP three months ago and everything was working fine. DBAs asked for more space and we added three more disks.

ioscan command was successful and showed up the three luns. Ran insf -e to create new device files. But when i tried to use HDLM software to create it reported an error that it is not seeing the devices. HDLM is out multi pathing driver. So I restarted the server.

After restart the server came up without the new luns/disks even though they were allocated in the storage array. So i removed the device files and restarted the server. Only one lun/disk among the three showed up and was usable and the remaining two were showing No_HW in the ioscan output.


I heard that this may be a bug. There are patches available to resolve this issue. Have any one heard about this kind of behavior that new luns added to the system not showing up even after reboot? If so pls tell me what did you do to fix this kind of problem

[Owen_15]

Hi Ramesh,

If the luns are showing NO_HW, that's normally pretty final that they are not available.

The one area to check would be syslog.log and see if it displaying any messages from the hba cards. There id's may have changed and been disabled until they are authorised.

With these non-native multipathing software kits, I would almost reboot the server once or twice more. I know this sounds terrible and is something that is not generally recommended for hpux systems, but I've seen odd things in the past with this sort of software.

Also, if you can see and use one lun okay, and all the previous luns, I'd suggest it may not be a server problem.

Good luck.

Regards
Owen

[ramesh rajan]

the following device had a HITACHI DISK-SUBSYSTEM identity before the disk failure/provisioning and when I lost my other path :

disk 29 0/5/1/0.63.16.0.0.2.0 sdisk CLAIMED DEVICE HITACHI OPEN-V (part of 0F:00 ? --became 04:20)
/dev/dsk/c8t2d0 /dev/rdsk/c8t2d0
disk 31 0/5/1/0.63.16.0.0.3.0 sdisk CLAIMED DEVICE HITACHI OPEN-V (part of 0F:10 ? -- became 04:28)
/dev/dsk/c8t3d0 /dev/rdsk/c8t3d0

When the consultant provision the disk it had changed to HITACHI OPEN-V and since my hdlm config since feb 2006 shows that device is not needed to be configure on HDLM.