Linux – delete the LUN and remove traces from OS |
In my previous article explained about how to delete disk from ASM library. In this article will learn to delete the LUN and remove traces from server. This article applicable for deleting ASM disk, standard partitioned disk and LVM physical volume. These steps works well for Redhat and SUSE.
Note: Be cautious in placing correct device names. Else you end up with data loss and broken server. Step1: collect kernel device names of LUN#multipath –ll mpatha mpatha (360a98000486e616e504a512345678908) [size=20 GB][features="1 queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [prio=16][active] \_ 3:0:1:24 sdba 67:64 [active][ready] \_ 3:0:3:24 sdda 70:128 [active][ready] \_ 4:0:2:24 sdga 131:96 [active][ready] \_ 4:0:3:24 sdha 133:0 [active][ready] \_ round-robin 0 [prio=4][enabled] \_ 3:0:0:24 sdaa 65:160 [active][ready] \_ 3:0:2:24 sdca 68:224 [active][ready] \_ 4:0:0:24 sdea 128:32 [active][ready] \_ 4:0:1:24 sdfa 129:192 [active][ready]
#cat /tmp/device_names sdba sdda sdga sdha sdaa sdca sdea sdfa Step2: Delete disk partition#kpartx -d /dev/mapper/mpatha
#ls -ltr /dev/mapper/mpatha* Step3: Remove the device from multipath
#multipath -f mpatha
#cp –p multipath.conf multipath.conf_bkp #vi multipath.conf (delete the entry associated with WWID which we got from previous step (360a98000486e616e504a512345678908)) Step4: Flush any outstanding I/O to deleted device
#for i in `cat /tmp/device_names` ; do ; blockdev –flushbufs devices /dev/$i ; done Step5: Remove path to devices from SCSI subsystem#for i in `cat /tmp/device_names` ; do ; echo 1 > /sys/block/$i/device/delete ; done That’s all. At here we deleted the LUN mpatha (360a98000486e616e504a512345678908). Removed all the traces that LUN left from kernel and SCSI subsystem. |
Posted - Tue, May 22, 2018 9:21 PM. This article has been viewed 2822 times. |
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