HP StorageWorks Scalable File Share - Manual (Page 88)

Creating and modifying file systems 5–4
5.1.3 Step 3: Setting roles, preferred controllers, and disk group information for
LUNs — EVA4000 storage
NOTE: In the example output shown in this section, the MDS role is assigned to four LUNs. This
configuration allows for two file systems, with two (mirrored) MDS LUNs for each file system.
NOTE: Setting the preferred controller for a LUN allows the HP SFS software to determine the appropriate
HBA and path to the LUN, and this improves performance.
You can set the role, the preferred controller, and the disk group information for a LUN at the same time, as
follows:
1. Use the Command View EVA Web interface to review each LUN in turn. Identify the following
information for the LUN:
• The WWID of the LUN
• Whether the
Preferred path/mode
field for the LUN is set to
Path A Failover/
failback
or
Path B Failover/failback
• The disk group the LUN is in
2. Enter the
show lun
command for the LUN and review the LUN information, as shown in the
following example. In this example, the role and the preferred controller have not been set for the
LUN:
sfs> show lun 600508b4-0000c06a-0001c000-008d0000
LUN (WWID): 600508b4-0000c06a-0001c000-008d0000
LUN (Number): 3
Device: /dev/hpls/dev27a
Array (WWID): 50001fe1-0013a6d0
Array (Number): 1
Array (Name): P4889B29IKW028
Current Controller: A
Preferred Controller: -
Type: array
Role: unknown
User: -
Size: 296960 MB
Preferred Server: -
Path from Server Preferred Current Available
---------------- --------- --------- --------------------
south1 none fc-0/A2 fc-0/B2 fc-0/A2
south2 none fc-0/A2 fc-0/B2 fc-0/A2
3. Set the preferred controller, role, and disk group information for the LUN by entering the
set lun
command, as shown in the following example. In this example, the role is set to
mds
; for OST LUNs,
set the role to
ost
:
sfs> set lun 3 preferred_controller=A role=mds disk_group=1
Do not specify a user for the LUN—the user is automatically assigned when the file system is set up (see
Section 5.1.5):
When you have finished assigning roles to all of the LUNs, use the
show lun
command to check the LUN
assignments, as shown in the following example:
sfs> show lun
LUN Array Role Used by Size(GB) Preferred Server Visible to
--- ----- ----- ---------- -------- ---------------- ----------
1 1 adm south1 40
- south[1-2]
2 1 service south1 1 - south[1-2]
3 1 mds - 290 - south[1-2]
4 1 mds - 290 - south[1-2]
5 1 mds - 290 - south[1-2]