Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010, Руководство администратора, Страница: 53 / 140

Managing Multipath I/O for Devices 53
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For information about modifying the
/etc/lvm/lvm.conf
file, see Section 7.2.3, “Using LVM2 on
Multipath Devices,” on page 46 .
7.3.4 The Linux multipath(8) Command
Use the Linux
multipath(8)
command to configure and manage multipathed devices.
General syntax for the
multipath(8)
command:
multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-F] [-p failover | multibus |
group_by_serial | group_by_prio| group_by_node_name ]
General Examples
Configure multipath devices:
multipath
Configure a specific multipath device:
multipath devicename
Replace devicename with the device node name such as
/dev/sdb
(as shown by udev in the
$DEVNAME variable), or in the
major:minor
format.
Selectively suppress a multipath map, and its device-mapped partitions:
multipath -f
Display potential multipath devices, but do not create any devices and do not update device maps
(dry run):
multipath -d
Configure multipath devices and display multipath map information:
multipath -v2 <device>
multipath -v3
The -v2 option in multipath -v2 -d shows only local disks. Use the -v3 option to show the full path
list. For example:
multipath -v3 -d
Display the status of all multipath devices, or a specified multipath device:
multipath -ll
multipath -ll <device>
Flush all unused multipath device maps (unresolves the multiple paths; it does not delete the
device):
multipath -F
multipath -F <device>
Set the group policy: