Red Hat ENTERPRISE LINUX 5.1 DM MULTIPATH Bedienungsanleitung PDF herunterladen (Seite 6)

White Paper

3. Next, the alias of iSCSI device will be created. The alias name will help iSCSI

device to be identified easily. Find the UUID of iSCSI device in Red below:

# multipath -ll

mpath1 (320a6001378a8a27a) Qsan,P150C

[size=100G][features=0][hwhandler=0]

\_ round-robin 0 [prio=1][undef]

\_ 2:0:0:0 sdb 8:16 [undef][ready]

\_ round-robin 0 [prio=1][undef]

\_ 3:0:0:0 sdc 8:32 [under][ready]

4. Edit the /etc/multipath.conf again:

ultipaths {

multipath {

wwid 320a6001378a8a27a

alias Qsandisk

path_grouping_policy multibus

path_checker directio

path_selector "round-robin 0"

failback manual

rr_weight priorities

no_path_retry 5

rr_min_io 10

}

5. Save the configuration file, and confirm that the persistent name to iSCSI device

has been created.

# multipath –ll

QsanDisk (320a6001378a8a27a) Qsan,P150C

[size=100G][features=1 queue_if_no_path][hwhandler=0]

\_ round-robin 0 [prio=1][undef]

\_ 2:0:0:0 sdb 8:16 [undef][ready]

\_ round-robin 0 [prio=1][undef]

\_ 3:0:0:0 sdc 8:32 [undef][ready]

# ls –l /dev/mapper

total 0

crw------- 1 root root 10, 63 Dec 26 17:19 control

brw-rw---- 1 root disk 253, 2 Dec 26 18:29 QsanDisk

brw-rw---- 1 root disk 253, 0 Dec 26 17:19 VolGroup00-LogVol00

brw-rw---- 1 root disk 253, 1 Dec 26 17:19 VolGroup00-LogVol01

Usually it uses the command multipath to manage the multipath devices. Here is the

parameter manual.

multipath

without parameters, create the devmaps for the multipath devices.

-F

clear all the existing devmaps of the multipath devices.

-f pathname

clear the existing devmap of the pathname specified.

-d

show the devmaps will be create but not really create or update

devmaps.

-l

show the current multipath topology from the information fetched in

sysfs and the device mapper.

-ll

show the current multipath topology form all available

information (sysfs, device mapper, path checkers…)

-v level

print all paths and multipaths.

0 no output

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