I am trying to free up a partition on my work desktop. One of the
partitions on the extra disk is part of an old RAID-1 configuration, and
I am trying to delete the raid drive from the system and re-format that
partition. However, whenever I try to use fdisk, it re-activates the
RAID even though I have already removed it.
Here is my partition table:
# fdisk -l /dev/sdb
Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x12c2c333
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/sdb2 206848 324458495 324251648 154.6G 7 HPFS/NTFS/exFAT
/dev/sdb3 324458496 358275071 33816576 16.1G 82 Linux swap /
Solaris
/dev/sdb4 * 358275072 1953523711 1595248640 760.7G 5 Extended
/dev/sdb5 358277120 419717119 61440000 29.3G 83 Linux
/dev/sdb6 419719168 481159167 61440000 29.3G 83 Linux
/dev/sdb7 481161216 1953523711 1472362496 702.1G 83 Linux
The device in question is /dev/sdb5.
Note how if I look at the mdstat file, it shows it is active. So I try
to fail the drive, but it won't let me. Then I stop the raid drive and
remove it, and it shows it is no longer there. Seems like it should work.
facofficeeng02:/home/george # cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb5[0]
30703616 blocks super 1.2 [2/1] [U_]
md1 : active raid1 sdb7[0]
736050176 blocks super 1.2 [2/1] [U_]
bitmap: 6/6 pages [24KB], 65536KB chunk
unused devices: <none>
facofficeeng02:/home/george # cat /etc/mdadm.conf
ARRAY /dev/md/facofficeeng02:1 UUID=a8872a97:eecd6828:f759773c:cb18678e
facofficeeng02:/home/george # cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb5[0]
30703616 blocks super 1.2 [2/1] [U_]
md1 : active raid1 sdb7[0]
736050176 blocks super 1.2 [2/1] [U_]
bitmap: 6/6 pages [24KB], 65536KB chunk
unused devices: <none>
facofficeeng02:/home/george # mdadm --fail /dev/md0 /dev/sdb5
mdadm: set device faulty failed for /dev/sdb5: Device or resource busy
facofficeeng02:/home/george # mdadm --stop /dev/md0
mdadm: stopped /dev/md0
facofficeeng02:/home/george # mdadm --remove /dev/md0
facofficeeng02:/home/george # cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb7[0]
736050176 blocks super 1.2 [2/1] [U_]
bitmap: 6/6 pages [24KB], 65536KB chunk
unused devices: <none>
However, then when I run fdisk again, just to try and mess with it, the
array re-activates itself:
acofficeeng02:/home/george # fdisk /dev/sdb
Welcome to fdisk (util-linux 2.28).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): q
facofficeeng02:/home/george # cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb5[0]
30703616 blocks super 1.2 [2/1] [U_]
md1 : active raid1 sdb7[0]
736050176 blocks super 1.2 [2/1] [U_]
bitmap: 6/6 pages [24KB], 65536KB chunk
unused devices: <none>
I wanted to use fdisk to try and do something to that partition, but the
array is reactivated as soon as I run fdisk. I tried gdisk for
experiment (I can't use gdisk because the drive is mbr, not gpt), and it
does the same thing. The drive re-activates itself.
How do I completely get rid of my system seeing the raid in this
partition and reactivating itself? I removed all the information from
the /etc/mdadm.conf file for that drive, so it is not getting
information from there.
I am on a 42.2 system.
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