Additional information seen in ioscan

[Paul Thomson_2]

Hi
One of my HPUX servers has recently had 2 LUNS presented from a 9990. These are usable and working as I would expect, however ioscan on the server shows the following.

ext_bus 4 0/4/1/0.7.0.0.0 fcd_vbus CLAIMED INTERFACE FCP Arr
ay Interface
target 8 0/4/1/0.7.0.0.0.0 tgt CLAIMED DEVICE
disk 4 0/4/1/0.7.0.0.0.0.0 sdisk CLAIMED DEVICE HITACHI
OPEN-V
/dev/dsk/c4t0d0 /dev/rdsk/c4t0d0
disk 5 0/4/1/0.7.0.0.0.0.1 sdisk CLAIMED DEVICE HITACHI
OPEN-V
/dev/dsk/c4t0d1 /dev/rdsk/c4t0d1
target 10 0/4/1/0.7.0.0.0.1 tgt CLAIMED DEVICE
disk 6 0/4/1/0.7.0.0.0.1.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 11 0/4/1/0.7.0.0.0.2 tgt CLAIMED DEVICE
disk 7 0/4/1/0.7.0.0.0.2.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 12 0/4/1/0.7.0.0.0.3 tgt CLAIMED DEVICE
disk 8 0/4/1/0.7.0.0.0.3.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 13 0/4/1/0.7.0.0.0.4 tgt CLAIMED DEVICE
disk 9 0/4/1/0.7.0.0.0.4.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 14 0/4/1/0.7.0.0.0.5 tgt CLAIMED DEVICE
DISK-SUBSYSTEM
target 15 0/4/1/0.7.0.0.0.6 tgt CLAIMED DEVICE
disk 11 0/4/1/0.7.0.0.0.6.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 16 0/4/1/0.7.0.0.0.7 tgt CLAIMED DEVICE
disk 12 0/4/1/0.7.0.0.0.7.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 17 0/4/1/0.7.0.0.0.8 tgt CLAIMED DEVICE
disk 13 0/4/1/0.7.0.0.0.8.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 18 0/4/1/0.7.0.0.0.9 tgt CLAIMED DEVICE
disk 14 0/4/1/0.7.0.0.0.9.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 19 0/4/1/0.7.0.0.0.10 tgt CLAIMED DEVICE
disk 15 0/4/1/0.7.0.0.0.10.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 20 0/4/1/0.7.0.0.0.11 tgt CLAIMED DEVICE
disk 16 0/4/1/0.7.0.0.0.11.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 21 0/4/1/0.7.0.0.0.12 tgt CLAIMED DEVICE
disk 17 0/4/1/0.7.0.0.0.12.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 22 0/4/1/0.7.0.0.0.13 tgt CLAIMED DEVICE
DISK-SUBSYSTEM
target 23 0/4/1/0.7.0.0.0.14 tgt CLAIMED DEVICE
disk 19 0/4/1/0.7.0.0.0.14.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM
target 24 0/4/1/0.7.0.0.0.15 tgt CLAIMED DEVICE
disk 20 0/4/1/0.7.0.0.0.15.0 sdisk CLAIMED DEVICE HITACHI
DISK-SUBSYSTEM


The storage guys have advised that only the two luns have been added to the lun security tables, what we are wondering is what are all these extra targets seen (DISK-SUBSYSTEM). I don't believe these luns as they only contain the target, unless there is a lot of LUN0's !

Any thoughts ?
Is there a setting missing on the 9990 ?

[Torsten. · Accepted solution]

These are "place holders" for future LUNs - no need to worry.
A special "mode" setting on the array can avoid this behaviour, but it is not a problem.

[Sandman!]

As already stated these are placeholder aka ghost LUNs. They exist so that other LUNs on that target can be scanned. Another deviation from the regular LUNs is that diskinfo returns a size of zero for these ghost LUNs.

~hope it helps

[Paul Thomson_2]

thanks , there was a setting on the array showing mask ghost luns.