multipath_handling
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| + | ====== Delete multipath device ====== | ||
| + | |||
| + | * Check the fstab for the devices that has to be removed. | ||
| + | * Be sure to unmount them! | ||
| + | * Check that you have uncommented or removed all ref. in /etc/fstab to the SAN LUN (Volume Group / Logical Volume) | ||
| + | * If LVM is used: | ||
| + | a. Remove the logical volumes | ||
| + | lvremove | ||
| + | b. Remove the volume groups | ||
| + | vgremove | ||
| + | c. Remove the physical volumes | ||
| + | pvremove | ||
| + | |||
| + | * Remove each path to the device from the SCSI subsystem. To do so, use the command echo 1 > /sys/block/device-name/device/delete where device-name may be sde, for example. | ||
| + | |||
| + | (Another variation of this operation is echo 1 > /sys/class/scsi_device/h:c:t:l/device/delete, where h is the HBA number, c is the channel on the HBA, t is the SCSI target ID, and l is the LUN) | ||
| + | |||
| + | a. Do this for every device name in the mpath that has to be removed: | ||
| + | |||
| + | b. Run multipath –ll to see the devices | ||
| + | Eg. : | ||
| + | echo 1 > /sys/block/sdck/device/delete | ||
| + | echo 1 > /sys/block/sdcw/device/delete | ||
| + | echo 1 > /sys/block/sdi/device/delete | ||
| + | echo 1 > /sys/block/sdu/device/delete | ||
| + | echo 1 > /sys/block/sdce/device/delete | ||
| + | echo 1 > /sys/block/sdcq/device/delete | ||
| + | echo 1 > /sys/block/sdc/device/delete | ||
| + | echo 1 > /sys/block/sdo/device/delete | ||
| + | | ||
| + | * If the device uses multipathing, run multipath -l and note all the paths to the device. | ||
| + | NB! Note the wwn before you delete the multipath! | ||
| + | |||
| + | * Remove the multipathed device using multipath -f device. | ||
| + | |||
| + | multipath –f mpath0 | ||
| + | |||
| + | * Ask SAN guys to remove the LUN(s). | ||
| + | * Reboot and follow startup from ILO | ||
| + | |||
| + | |||
| + | Thanks to Mikkel Arnberg for the input to this article. | ||
| + | |||
| + | Reference: | ||
| + | http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/removing_devices.html#clean-device-removal | ||
multipath_handling.txt · Last modified: 2012/10/11 08:56 by root
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