Re: How to find LUN UUID on a Solaris host.

YASIRIMTEYAZ · ‎2013-11-15

In my scenario, LUNs are exposed to Solaris and Linux hosts via iSCSI. (We would be using FC connection too soon)

When LUNs are available to the host over iSCSI:

On a Linux host, I can get the LUN UUID from /dev/disk/by-id as follows -

$ ls -l /dev/disk/by-id

total 0

lrwxrwxrwx 1 root root 9 Nov 11 05:44 scsi-3600144f0dae0dd2200005280d1c80039 -> ../../sda

lrwxrwxrwx 1 root root 9 Nov 11 05:44 scsi-360a98000486e58676834746d7650724d -> ../../sdb

lrwxrwxrwx 1 root root 10 Nov 11 05:44 scsi-360a98000486e58676834746d7650724d-part1 -> ../../sdb1

In the above output, text in bold denotes the LUN UUID.

On a Solaris host, I am unable to get the UUID.
Since /dev/disk/by-id doesn't exist in Solaris, I am using iscsiadm command to get the LUN info.

####################################

# NetApp LUN exposed on a Solaris Host

####################################

bash-4.1# /usr/sbin/iscsiadm list target -S

Target: iqn.1992-08.com.netapp:sn.118057984

Alias: -

TPGT: 2000

ISID: 4000002a0000

Connections: 1

LUN: 0

Vendor: NETAPP

Product: LUN

OS Device Name: /dev/rdsk/c8t7d0s2

The LUN device on this Solaris host is appearing as /dev/rdsk/c8t7d0s2. With this, I am unable to get the LUN UUID.

When I try the same with a Sun ZFS filer, the OS Device Name contains the UUID.

#############################

# Sun ZFS LUN on a Solaris Host

#############################

bash-3.2# /usr/sbin/iscsiadm list target -S

Target: iqn.1986-03.com.sun:02:4b6d6ce8-9960-c7db-8742-f901f4eb95ca

Alias: kopnas301-iscsi

TPGT: 2

ISID: 4000002a0000

Connections: 1

LUN: 0

Vendor: SUN

Product: Sun Storage 7310

OS Device Name: /dev/rdsk/c1t600144F0DAE0DD22000052850E75003Ad0s2

How can I get the NetApp LUN UUID on a Solaris host?

Any help would be much appreciated.

Thanks

HARI_KRISHNA981 · ‎2013-11-15

Hi Yasir,

Go through this thread, it contains the command to retrieve the LUN info

http://www.sunsolarisadmin.com/solaris-10/list-luns-attached-to-hbadisk-controllers-in-solaris-10/

http://blogs.warwick.ac.uk/peggleton/entry/disks_cfgadm_fcinfo/

I hope it may help you.

Regards,

Hari.

YASIRIMTEYAZ · ‎2013-11-15

Thanks Hari for your response.

Both of the links have details when LUNs are connected through Fibre Channel (via HBA ports). However, I am using iSCSI connection.

The fcinfo, luxamd commands won't work with iSCSI connection.

Those threads couldn't help me.

HARI_KRISHNA981 · ‎2013-11-15

Hi Yasir,

Go through this thread.

http://www.cuddletech.com/blog/pivot/entry.php?id=779

Regards,

Hari.

YASIRIMTEYAZ · ‎2013-11-15

Thanks Hari.

Went through the above thread. In the thread, an example of SUN filer is taken.

As I have mentioned, if the LUN is coming from a SUN ZFS filer the LUN UUID can be obtained from /dev/dsk/.......

Only in case of NetApp, I am unable to figure out the LUN UUID.

As per the thread, I tried format command too, but I am not seeing the UUID.

bash-4.1# /sbin/format

Searching for disks...done

AVAILABLE DISK SELECTIONS:

0. c7t0d0 <LSI-MR9261-8i-2.12-556.90GB>

/pci@0,0/pci8086,340a@3/pci1000,9263@0/sd@0,0

1. c7t1d0 <LSI-MR9261-8i-2.12-278.46GB>

/pci@0,0/pci8086,340a@3/pci1000,9263@0/sd@1,0

2. c7t2d0 <LSI-MR9261-8i-2.12-278.46GB>

/pci@0,0/pci8086,340a@3/pci1000,9263@0/sd@2,0

3. c7t3d0 <LSI-MR9261-8i-2.12-278.46GB>

/pci@0,0/pci8086,340a@3/pci1000,9263@0/sd@3,0

4. c7t4d0 <LSI-MR9261-8i-2.12-278.46GB>

/pci@0,0/pci8086,340a@3/pci1000,9263@0/sd@4,0

5. c7t5d0 <LSI-MR9261-8i-2.12-278.46GB>

/pci@0,0/pci8086,340a@3/pci1000,9263@0/sd@5,0

6. c8t6d0 <NETAPP-LUN-7340-2.00TB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805821507D0,0

7. c8t7d0 <NETAPP-LUN-7340-2.00TB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805798407D0,0

8. c8t8d0 <NETAPP-LUN-7340-50.00GB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805821507D0,1

9. c8t9d0 <NETAPP-LUN-7340-50.00GB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805821507D0,2

10. c8t10d0 <NETAPP-LUN-7340-50.00GB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805821507D0,3

11. c8t11d0 <NETAPP-LUN-7340-50.00GB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805821507D0,4

12. c8t12d0 <NETAPP-LUN-7340-50.00GB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805821507D0,5

13. c8t13d0 <NETAPP-LUN-7340-50.00GB>

/iscsi/disk@0000iqn.1992-08.com.netapp%3Asn.11805821507D0,6

- hit space for more or s to select -

bash-4.1#

aborzenkov · ‎2013-11-15

Why do you need to know UUID? It is not directly visible on NetApp anyway and does not help in identifying LUNs.

YASIRIMTEYAZ · ‎2013-11-16

I want to know the UUID to map the OS scsi device with the LUN on filer.
The LUN UUID can be fetched on NetApp with Data ONTAP api.