红帽全球峰会3.2. 在生成多路径设备时忽略逻辑磁盘
Some machines have local SCSI cards for their internal disks. DM Multipath is not recommended for these devices. If you set the
find_multipaths configuration parameter to yes, you should not have to blacklist these devices. For information on the find_multipaths configuration parameter, see 第 4.3 节 “配置文件默认设置”.
If you do not set the
find_multipaths configuration parameter to yes, can use the following procedure to modify the multipath configuration file to ignore the local disks when configuring multipath.
- 确定哪些磁盘是内部磁盘并将其列入黑名单。In this example,
/dev/sdais the internal disk. Note that as originally configured in the default multipath configuration file, executing themultipath -v2command shows the local disk,/dev/sda, in the multipath map.This examples specifies the-doption of themultipathcommand to indicate that this is a dry run that will not create the multipath devices. For further information on themultipathcommand output, see 第 5.7 节 “Multipath Command Output”.# multipath -v2 -d : SIBM-ESXSST336732LC____F3ET0EP0Q000072428BX1 undef WINSYS,SF2372 size=33 GB features="0" hwhandler="0" wp=undef `-+- policy='round-robin 0' prio=1 status=undef |- 0:0:0:0 sda 8:0 [--------- : 3600a0b80001327d80000006d43621677 undef WINSYS,SF2372 size=12G features='0' hwhandler='0' wp=undef `-+- policy='round-robin 0' prio=1 status=undef |- 2:0:0:0 sdb 8:16 undef ready running `- 3:0:0:0 sdf 8:80 undef ready running : 3600a0b80001327510000009a436215ec undef WINSYS,SF2372 size=12G features='0' hwhandler='0' wp=undef `-+- policy='round-robin 0' prio=1 status=undef |- 2:0:0:1 sdc 8:32 undef ready running `- 3:0:0:1 sdg 8:96 undef ready running : 3600a0b80001327d800000070436216b3 undef WINSYS,SF2372 size=12G features='0' hwhandler='0' wp=undef `-+- policy='round-robin 0' prio=1 status=undef |- 2:0:0:2 sdd 8:48 undef ready running `- 3:0:0:2 sdg 8:112 undef ready running : 3600a0b80001327510000009b4362163e undef WINSYS,SF2372 size=12G features='0' hwhandler='0' wp=undef `-+- policy='round-robin 0' prio=1 status=undef |- 2:0:0:3 sdd 8:64 undef ready running `- 3:0:0:3 sdg 8:128 undef ready running - In order to prevent the device mapper from mapping
/dev/sdain its multipath maps, edit the blacklist section of the/etc/multipath.conffile to include this device. Although you could blacklist thesdadevice using adevnodetype, that would not be a safe procedure since/dev/sdais not guaranteed to be the same on reboot. To blacklist individual devices, you can blacklist using the WWID of that device.请注意：在multipath -v2命令的输出中，/dev/sda设备的 WWID 是 SIBM-ESXSST336732LC____F3ET0EP0Q000072428BX1。要将这个设备列入黑名单，请在/etc/multipath.conf文件中添加以下内容。blacklist { wwid SIBM-ESXSST336732LC____F3ET0EP0Q000072428BX1 } - 在您更新
/etc/multipath.conf文件后，您必须手动让multipathd守护进程重新载入该文件。以下命令可重新载入更新的/etc/multipath.conf文件。# systemctl reload multipathd.service
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