Using The Operating System Device Mapper Multipath (Dm-Mpio) - IBM V7000 Introduction And Implementation Manual

This filesystem will be automatically checked every 27 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@Palau ~]#
3. Create the mount point, and mount the vpath drive, as shown in Example 12-26.
Example 12-26 Mount point
[root@Palau ~]# mkdir /itsosvc
[root@Palau ~]# mount -t ext3 /dev/vpatha /itsosvc
4. The drive is now ready for use. The df command shows us the mounted disk /itsosvc,
and the datapath query command shows that four paths are available. See
Example 12-27.
Example 12-27 Display mounted drives
[root@Palau ~]# df
Filesystem
/dev/mapper/VolGroup00-LogVol00
/dev/hda1
none
/dev/vpatha
[root@Palau ~]#
[root@Palau ~]# datapath query device
Total Devices : 1
DEV#:
SERIAL: 60050768018201bee000000000000035
============================================================================
Path#
0
1
2
3
[root@Palau ~]#

12.6.4 Using the operating system Device Mapper Multipath (DM-MPIO)

Red Hat Enterprise Linux 5 (RHEL5) and later, and SUSE Linux Enterprise Server 10
(SLES10) and later provide their own multipath support for the operating system. Therefore,
you do not have to install an additional device driver such as SDD.
Always check whether your operating system includes one of the supported multipath drivers.
You can obtain this information in the links that are provided in 12.6.1, "Linux Fibre Channel
attachment" on page 560. In SLES10, the multipath drivers and tools are installed by default.
For RHEL5, though, the user has to explicitly choose the multipath components during the
operating system installation to install them. Each of the attached SVC LUNs has a special
device file in the Linux /dev directory.
566
IBM Flex System V7000 Storage Node Introduction and Implementation Guide
1K-blocks
74699952
101086
1033136
1032088
0 DEVICE NAME: vpatha TYPE: 2145
Adapter/Hard Disk
Host0Channel0/sda
Host0Channel0/sdb
Host1Channel0/sdc
Host1Channel0/sdd
Used Available Use% Mounted on
2564388 68341032 4% /
13472 82395 15% /boot
0 1033136 0% /dev/shm
34092 945568 4% /itsosvc
POLICY: Optimized Sequential
State Mode
OPEN NORMAL
OPEN NORMAL
OPEN NORMAL
OPEN NORMAL
Select Errors
1 0
6296 0
6178 0
0 0