HP StorageWorks Scalable File Share - Manual (Page 147)

Verifying the system 6–17
6.1.5.2 Verifying the performance of LUNs on a single server
CAUTION: Do not use the procedure described here to test the performance of a LUN that is a mirrored
LUN or a component of a mirrored LUN (MDS LUNs are usually mirrored). If the output of the
show lun
command shows the LUN role as
mirror
, do not run the
raw_lun_check.bash
command on the LUN.
If you do so, the contents of the LUN may be destroyed.
The
/usr/opt/hpls/diags/bin/raw_lun_check.bash
command tests the performance of LUNs on
a single server. You must only run this command against one server at a time. Do not use the
/usr/opt/
hpls/diags/bin/raw_lun_check.bash
command to test the performance of a mirrored LUN or a
LUN that is a component of a mirrored LUN.
Although you can use the
/usr/opt/hpls/diags/bin/raw_lun_check.bash
command on a LUN
that has never been used in a file system, the test must format the LUN before the test can start. You can
format the LUN by using the
-f
and
-r
arguments with the
raw_lun_check.bash
command. However,
formatting a LUN can take a long time; for this reason, it is best to postpone testing the LUNs until they have
been used in a file system.
When you run the
/usr/opt/hpls/diags/bin/raw_lun_check.bash
command, the command first
checks if the LUN is a mirrored LUN component, and an error message may be displayed, as follows:
• If the LUN is a component of a mirrored LUN and the database is available, the following error
message is displayed:
# /usr/opt/hpls/diags/bin/raw_lun_check.bash -l "/dev/hpls/dev3a"
Checking for mirror components in database
Usage: raw_lun_check.bash [-h] | [-v] [-r -f] [-i ] -l
<-s | -p>
Where:
-s, --serial Run a serial lun test
-p, --parallel Run a parallel lun test
-l, --lun Set the lun to test
-i, --iozone Use iozone instead of default
-r, --reformat Reformat the lun before running the test
-f, --force Force the reformat
-h, --help Print this help
-v, --verbose Give verbose output
You must NOT test a component of a mirror (/dev/hpls/dev3a)
#
• If the database is unavailable, the following message will be displayed. If the database is
unavailable, do not continue until you are certain that all LUNs to be tested are not components of a
mirrored LUN:
# /usr/opt/hpls/diags/bin/raw_lun_check.bash -l "/dev/hpls/dev3a"
Checking for mirror components in database
Database not ready - could not determine if luns to test are mirror components
Continue? [y/n]: n
Exiting by user request
#
In serial mode, the
/usr/opt/hpls/diags/bin/raw_lun_check.bash
command tests each
specified device (on the same server) in turn. In parallel mode, the command tests all specified devices (on
the same server) at the same time. The output from the command displays the speed at which the command
was able to read from and write to the specified device.