HP StorageWorks Scalable File Share - Manual (Page 148)

Verifying, diagnosing, and maintaining the system 6–18
To verify the performance of LUNs on one server, perform the following steps:
1. Enter the
show lun lun_number
command and determine whether the LUN is part of a file system
or not:
sfs> show lun 8
.
.
.
User: data
.
.
.
• If the
User
field contains the name of a server, the LUN is not an MDS or OST LUN; in this case,
do not proceed with this test.
• If the
User
field is empty, that is, it shows a dash (
-
), the LUN is not used by a file system.
Although you can use the
raw_lun_check.bash
test on a LUN that has never been used in a
file system, the test must format the LUN before the test can start, and this can take a long time.
2. If the LUN is part of a file system, you must stop the file system before running the test, as shown in the
following example, where the
data
file system is stopped:
sfs> stop filesystem data
3. Verify that all MDS and OST services used by the file systems are stopped, as shown in the following
example:
sfs> show filesystem
Name State Services
------------- -------------- ----------------------------------
data stopped mds1: stopped, ost[1-8]: stopped
If all services are not in the
stopped
state, do not continue with the test.
4. Perform the following tests for each server.
a.
Determine the device name of the MDS or OST service(s) you want to test, by entering the
show
lun lun _ number
command, as shown in the following example:
sfs> show lun 8
LUN (WWID): 600508b4-0000c118-00019000-006c0000
LUN (Number): 8
Device: /dev/hpls/dev8a
.
.
.
b. You can run the
raw_lun_check.bash
command in serial mode to test the specified MDS or
OST devices one at a time, or in parallel mode to test all of the specified devices at the same
time.
• To run the command in serial mode, enter the command using the following syntax, where
lun_device
is the name of a device to be tested. Run the command from the
administration server:
/usr/opt/hpls/diags/bin/raw_lun_check.bash
--lun "lun_device [lun_device ...]" --serial
When the command finishes, the speed at which it wrote to and read from each device that
it tested is displayed, as shown in the following example:
# ssh south6 /usr/opt/hpls/diags/bin/raw_lun_check.bash -lun "/dev/hpls/
dev7a /dev/hpls/dev8a" --serial
Checking for mirror components in database
Checking lun status...
Checking lun status...
Starting lun test
Speed for write to /dev/hpls/dev7a: 75 MB/s
Speed for read to /dev/hpls/dev7a: 145 MB/s
Speed for write to /dev/hpls/dev8a: 74 MB/s