Clear RAID Signatures on Linux: Difference between revisions
From Leo's Notes
This page was last edited on 15 December 2016, at 19:34.
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You may need to clear RAID | You may need to clear RAID configs left on hard drives when trying to install Linux on a disk from a RAID array. | ||
Installers such as Anaconda will not list drives with these RAID signatures. If you're unable to find a disk in Anaconda, clear the configs using the steps below. | |||
== Listing Devices == | == Listing Devices == | ||
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== Removing Devices == | == Removing Devices == | ||
Use any one of these methods to clear the RAID configs from the disk. The bulletproof method is to use {{code|dd}}. | |||
Remove using {{code|dmsetup}}: | Remove using {{code|dmsetup}}: | ||
{{highlight|lang=terminal|code= | {{highlight|lang=terminal|code= | ||
dmsetup remove /dev/mapper/ddfs1_backups | # dmsetup remove /dev/mapper/ddfs1_backups | ||
}} | }} | ||
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Remove by overwriting the raid configs using {{code|dd}}. The location the configs are located at the last 1024 sectors of the disk. | Remove by overwriting the raid configs using {{code|dd}}. The location the configs are located at the last 1024 sectors of the disk. | ||
{{highlight|lang=terminal|code= | {{highlight|lang=terminal|code= | ||
dd if=/dev/zero of=/dev/sda bs=512 seek=$(( $(blockdev --getsz /dev/sda) - 1024 )) count=1024 | # dd if=/dev/zero of=/dev/sda bs=512 seek=$(( $(blockdev --getsz /dev/sda) - 1024 )) count=1024 | ||
}} | }} | ||
After removing the configs, verify using {{code|dmraid -r}}. | |||
[[Category:Linux]] | [[Category:Linux]] | ||
Revision as of 19:34, 15 December 2016
You may need to clear RAID configs left on hard drives when trying to install Linux on a disk from a RAID array.
Installers such as Anaconda will not list drives with these RAID signatures. If you're unable to find a disk in Anaconda, clear the configs using the steps below.
Listing Devices
# dmraid -r
/dev/sda: ddf1, ".ddf1_backups", GROUP, ok, 3904294912 sectors, data@ 0
Removing Devices
Use any one of these methods to clear the RAID configs from the disk. The bulletproof method is to use dd.
Remove using dmsetup:
# dmsetup remove /dev/mapper/ddfs1_backups
Remove using dmraid:
# dmraid -r -E /dev/sda
Do you really want to erase "ddf1" ondisk metadata on /dev/sda ? [y/n] :y
ERROR: ddf1: seeking device "/dev/sda" to 1024204253954048
ERROR: writing metadata to /dev/sda, offset 2000398933504 sectors, size 0 bytes returned 0
ERROR: erasing ondisk metadata on /dev/sda
Remove by overwriting the raid configs using dd. The location the configs are located at the last 1024 sectors of the disk.
# dd if=/dev/zero of=/dev/sda bs=512 seek=$(( $(blockdev --getsz /dev/sda) - 1024 )) count=1024
After removing the configs, verify using dmraid -r.