Persistent DSFs do not bind to a wwid

[sergiu11]

Hello,

I am having a problem on 11.31 with new assigned SAN disks. Due to the fact that wwids are not mapped to the dsfs, the lun is seen double:

</tmp> inq -f_emc -sid -showvol -nodots | grep disk | grep -i 06c3
/dev/rdisk/disk375 :EMC :SYMMETRIX :5772 :64006c3000 : 006C3: 107520000 :000290103264
/dev/rdisk/disk396 :EMC :SYMMETRIX :5772 :64006c3000 : 006C3: 107520000 :000290103264

</tmp> ioscan -m dsf /dev/rdisk/disk375
Persistent DSF Legacy DSF(s)
========================================
/dev/rdisk/disk375 /dev/rdsk/c24t4d7

</tmp> ioscan -m dsf /dev/rdisk/disk396
Persistent DSF Legacy DSF(s)
========================================
/dev/rdisk/disk396 /dev/rdsk/c22t4d7

It's one lun (06C3) but seen twice. This would have been normal for the legacy dsfs, but not for the persistent one which should have been only 1.

</tmp> ioscan -P health /dev/rdisk/disk375
Class I H/W Path health
===============================
disk 375 64000/0xfa00/0x84 online

</tmp> scsimgr get_info all_lpt -D /dev/rdisk/disk375

STATUS INFORMATION FOR LUN PATH : lunpath231

Generic Status Information

SCSI services internal state = UNOPEN
Open close state = ACTIVE
Protocol = fibre_channel
EVPD page 0x83 description code = 0
EVPD page 0x83 description association = 0
EVPD page 0x83 description type = 0
World Wide Identifier (WWID) = N/A
Total number of Outstanding I/Os = 0
Maximum I/O timeout in seconds = 30
Maximum I/O size allowed = 2097152
Maximum number of active I/Os allowed = 8
Maximum queue depth = 8
Queue full delay count = 0
Asymmetric state = NA
Device preferred path = No
Relative target port identifier = NA
Target port group identifier = NA

There is no NO_HW disk on the system and there are luns which are being displayed ok. On the storage side things seem to be ok. Before being zoned to this system, they were zoned to another one (also 11.31) where they were working ok.

Here is a lun that does not have problems:

</tmp> scsimgr get_info all_lpt -D /dev/rdisk/disk17

STATUS INFORMATION FOR LUN PATH : lunpath16

Generic Status Information

SCSI services internal state = ACTIVE
Open close state = ACTIVE
Protocol = fibre_channel
EVPD page 0x83 description code = 1
EVPD page 0x83 description association = 0
EVPD page 0x83 description type = 3
World Wide Identifier (WWID) = 0x60060480000290103260533031394345
Total number of Outstanding I/Os = 0
Maximum I/O timeout in seconds = 30
Maximum I/O size allowed = 2097152
Maximum number of active I/Os allowed = 8
Maximum queue depth = 8
Queue full delay count = 0
Asymmetric state = NA
Device preferred path = No
Relative target port identifier = 55
Target port group identifier = NA

STATUS INFORMATION FOR LUN PATH : lunpath18

Generic Status Information

SCSI services internal state = ACTIVE
Open close state = ACTIVE
Protocol = fibre_channel
EVPD page 0x83 description code = 1
EVPD page 0x83 description association = 0
EVPD page 0x83 description type = 3
World Wide Identifier (WWID) = 0x60060480000290103260533031394345
Total number of Outstanding I/Os = 0
Maximum I/O timeout in seconds = 30
Maximum I/O size allowed = 2097152
Maximum number of active I/Os allowed = 8
Maximum queue depth = 8
Queue full delay count = 0
Asymmetric state = NA
Device preferred path = No
Relative target port identifier = 49
Target port group identifier = NA

</tmp> ioscan -m dsf /dev/rdisk/disk17
Persistent DSF Legacy DSF(s)
========================================
/dev/rdisk/disk17 /dev/rdsk/c12t3d4
/dev/rdsk/c10t3d4

What should I do in order to be able to link the wwid to the dsf and have the native multipath working ok?

Thank you

[Duncan Edmonstone · Accepted solution]

I've seen this on Symmetrix before where you don't have the correct settings on the EMC array for HP-UX11iv3 - the settings are not the same as for 11iv1/11iv2. Can't remember what they are, but you should check with your EMC support folks.

[sergiu11]

Thanks Duncan,

it turned out to be so. The issue was on the storage box. Many thanks

Sergiu