Rescan linux partition table on active disk with centos 6

If you try to rescan the partition table of an active disk it will fail and require a reboot to discover new partitions.

You can get around this by using partx which will scan for individual new partitions and inject them into the running kernel.

 

#partx -v -a /dev/sda

 

root@linux # partx -l /dev/sda
# 1:      2048-  1026047 (  1024000 sectors,    524 MB)
# 2:   1026048-1048575999 (1047549952 sectors, 536345 MB)
# 3: 1048576000-1572859889 (524283890 sectors, 268433 MB)
# 4:         0-       -1 (        0 sectors,      0 MB)
root@linux# partx -v -a /dev/sda
device /dev/sda: start 0 size 1572864000
gpt: 0 slices
dos: 4 slices
# 1:      2048-  1026047 (  1024000 sectors,    524 MB)
# 2:   1026048-1048575999 (1047549952 sectors, 536345 MB)
# 3: 1048576000-1572859889 (524283890 sectors, 268433 MB)
# 4:         0-       -1 (        0 sectors,      0 MB)
BLKPG: Device or resource busy
error adding partition 1
BLKPG: Device or resource busy
error adding partition 2
added partition 3

 

1 Response

  1. Federico May 2, 2017 / 6:39 pm

    Hi, great post. What about same partitions but different geometry? I get “BLKPG: Device or resource busy” error.
    Regards,
    Federico

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