Dell PowerVault MD3220 - Manual (Page 184)

184 Configuration: Device Mapper Multipath for Linux
On SLES 11.x hosts, a partition node has the format
/dev/mapper/mpath<x>-part<y>, where <x> is letter(s) assigned to the
multipathing device and <y> is the partition number.
On SLES 10.3 hosts, a partition node has the format
/dev/mapper/mpath<x>_part<y>, where <x> is the letter(s) assigned to
the multipathing device and <y> is the partition number.
NOTE: After creating a partition on a multipathing device, all I/O operations,
including file system creation, raw I/O and file system I/O, must be done through the
partition node, and not through the multipathing device nodes.
Create a File System on a Device Mapper Partition
Use the standard mkfs command to create the file system on the newly
created Device Mapper partition
For example:
# mkfs –t <filesystem type> /dev/mapper/<partition
node>
where <partition node> is the partition on which the file system is created.
Mount a Device Mapper Partition
Use the standard mount command to mount the Device Mapper partition:
# mount /dev/mapper/<partition_node> <mounting_point>
Ready for Use
The newly created virtual disks created on the MD3200 Series array are now
setup and ready to be used. Future reboots automatically finds multipathing
devices along with their partitions.
Blacklist Local Drive in Multi-path Driver
If your multipath drivers are connecting to storage area networks (SANs), it
may be useful to be able to exclude or "blacklist" certain devices in your
/etc/multipath.conf file. Blacklisting prevents the multipath driver from
attempting to use those local devices.
To blacklist a local drive or device:
1 Run the multipath -l command to determine the local drive or
device WWID (World-Wide Identifier) or vendor/model string.
book.book Page 184 Tuesday, June 18, 2013 2:53 PM