Solaris – How to Scan FC LUNS and SCSI Disks ?

Application’s and Database’s storage requirement on the servers will be keep on increase day by day. According to that, Unix admin need to increase filesystem space on Unix servers periodically. Assigning big SAN space to filesystem also not possible since storage cost involved on that. So it’s a routine work for Unix admin and need to follow best practice for scanning the storage and adding in to the filesystem. In Solaris, we can able to scan the LUNS without rebooting the host. But in rare circumstances, we may need to end up with server reboot to see newly assigned  LUNS. Here we will see how to scan the local disks and SAN LUNs in Solaris host.

Scanning FC/SAN LUNS in Solaris

Before scanning LUNS, we see some useful commands which are related to Fibre Channel(FC).

1.List the connected HBA’s.

root@Unixarena-SOL11:~# luxadm -e port |grep CONNECTED
/devices/pci@1d,700000/SUNW,qlc@1,1/fp@0,0:devctl CONNECTED
/devices/pci@1d,700000/SUNW,qlc@3/fp@0,0:devctl CONNECTED

2.Verify FC channel ‘s are connected and configured.

Unix@sol# cfgadm -al -o show_FCP_dev |grep fc-fabric
c2                             fc-fabric    connected    configured   unknown
c4                             fc-fabric    connected    configured   unknown
Unix@sol#

3.To find the HBA’s World wide Node number (WWN),use fcinfo command,

Unix@sol# fcinfo hba-port |grep Port
HBA Port WWN: 10000000c884bb48
HBA Port WWN: 10000000c884bb49
HBA Port WWN: 10000000c884b85c
HBA Port WWN: 10000000c884b85d
Unix@sol#

4.You can also find the WWN form luxadm command, if  HBA is  already connected to FC switch.

Unix@sol# luxadm -e dump_map /dev/cfg/c4
Pos  Port_ID Hard_Addr Port WWN         Node WWN         Type
0    29900   0        50080e8008cfb814 50080e8008cfb814 0x0  (Disk device)
1    27400   0        10000000c884b85c 20000000c884b85c 0x1f (Unknown Type,Host Bus Adapter)
Unix@sol#

From the above output, the last line shows the HBA information.In the same you can find the other controller information as well.

5.Zoning can be verified using the below command.

Unix@sol# cfgadm -al -o show_FCP_dev c2 c4

6.If you see any controller port “WWN” showing as “unconfigured” ,then  you can initiate FC session using below mentioned command.

Unix@sol# cfgadm -c configure c2::50080e8008cfb814
Unix@sol# cfgadm -c configure c4::50080e8008cfb814

Let’s see how we can re-scan the SAN/FC luns on solaris 10/11 hosts.

To scan new FC luns, Just execute the below commands.

Scanning FC/SAN LUNS
1	cfgadm -al	To scan FC luns
2	devfsadm -c disk	To make sure all the device files are created
3	tail /var/adm/messages	To see the new LUN’s information
4	echo |format	To get the new LUN’s information
5	ls -lrt /dev/rdsk |grep s2|tail	To get the new LUN’s information

root@Unixarena-SOL11:~# luxadm -e port |grep CONNECTED
/devices/pci@1d,700000/SUNW,qlc@1,1/fp@0,0:devctl CONNECTED
/devices/pci@1d,700000/SUNW,qlc@3/fp@0,0:devctl CONNECTED

2.Reset the HBA using forcelip option.

root@Unixarena-SOL11:~# luxadm -e forcelip /devices/pci@1d,700000/SUNW,qlc@1,1/fp@0,0:devctl

Forcelip can be issued to the controller names as well.

Unix@sol# cfgadm -al -o show_FCP_dev |grep fc-fabric
c2                             fc-fabric    connected    configured   unknown
c4                             fc-fabric    connected    configured   unknown
Unix@sol#
Unix@sol# luxadm -e forcelip /dev/cfg/c2

3. Verify the controller status using “cfgadm -al”.Make sure disks didn;t loose any SAN paths after the HBA reset. If everything seems to be okay ,then isssue the forcelip to the another controller.

If still you are not able to see the new FC/SAN LUNS ,then reboot the server and try. Once you see the new lun, make sure that  multiple FC paths are enabled to that. Minimum two FC paths required for SAN disks.

” luxadm display /dev/rdsk/c1txxxxxxd0s2″  – To verify the FC lun details and multipathing.

 

root@Unixarena-SOL11:~# echo |format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
       0. c8t0d0 
          /pci@0,0/pci15ad,1976@10/sd@0,0
       1. c8t1d0 
          /pci@0,0/pci15ad,1976@10/sd@1,0
       2. c8t2d0 
          /pci@0,0/pci15ad,1976@10/sd@2,0
       3. c8t3d0 
          /pci@0,0/pci15ad,1976@10/sd@3,0
       4. c8t4d0 
          /pci@0,0/pci15ad,1976@10/sd@4,0
       5. c8t5d0 
          /pci@0,0/pci15ad,1976@10/sd@5,0
       6. c8t6d0 
          /pci@0,0/pci15ad,1976@10/sd@6,0
Specify disk (enter its number): Specify disk (enter its number):
root@Unixarena-SOL11:~#

root@Unixarena-SOL11:~# devfsadm -c disk
root@Unixarena-SOL11:~# echo |format
Searching for disks...done


AVAILABLE DISK SELECTIONS:
       0. c8t0d0 
          /pci@0,0/pci15ad,1976@10/sd@0,0
       1. c8t1d0 
          /pci@0,0/pci15ad,1976@10/sd@1,0
       2. c8t2d0 
          /pci@0,0/pci15ad,1976@10/sd@2,0
       3. c8t3d0 
          /pci@0,0/pci15ad,1976@10/sd@3,0
       4. c8t4d0 
          /pci@0,0/pci15ad,1976@10/sd@4,0
       5. c8t5d0 
          /pci@0,0/pci15ad,1976@10/sd@5,0
       6. c8t6d0 
          /pci@0,0/pci15ad,1976@10/sd@6,0
       7. c8t8d0 
          /pci@0,0/pci15ad,1976@10/sd@8,0
Specify disk (enter its number): Specify disk (enter its number):
root@Unixarena-SOL11:~#

root@Unixarena-SOL11:~# cfgadm -al
Ap_Id                          Type         Receptacle   Occupant     Condition
c8                             scsi-bus     connected    configured   unknown
c8::dsk/c8t0d0                 disk         connected    configured   unknown
c8::dsk/c8t1d0                 disk         connected    configured   unknown
c8::dsk/c8t2d0                 disk         connected    configured   unknown
c8::dsk/c8t3d0                 disk         connected    configured   unknown
c8::dsk/c8t4d0                 disk         connected    configured   unknown
c8::dsk/c8t5d0                 disk         connected    configured   unknown
c8::dsk/c8t6d0                 disk         connected    configured   unknown
c8::dsk/c8t8d0                 disk         connected    configured   unknown
cfgadm: Configuration administration not supported: Error: hotplug service is pr                                                             ble the service. See cfgadm_shp(1M) for more details.
root@Unixarena-SOL11:~# 
root@Unixarena-SOL11:~# devfsadm -c disk
root@Unixarena-SOL11:~#