Re: delete whole file system

["Kengo.M" <kengo@kyoto-arc.or.jp>]

Hi Hugo

Thanks for your inform.

I know wipefs.
But it's too primitive.
I will try to later.
Thanks again

kengo
At 10:12 +0100 2022.09.06, Hugo Mills wrote:
>On Tue, Sep 06, 2022 at 05:59:21PM +0900, Kengo.M wrote:
>>  Hi folks
>>
>>  I made raid5 file system by btrfs like below
>>
>>  sudo mkfs.btrfs -L raid5.btrfs -d raid5 -m raid1 -f /dev/sda /dev/sdb
>>  /dev/sdc /dev/sdd /dev/sde
>>
>>  And mount /mnt/raid5.btrfs
>>
>>  sudo btrfs filesystem show
>>
>>  Label: 'raid5.btrf'  uuid: 23a34a45-8f5e-40f5-8cda-xxxxxxxxxxxx
>>          Total devices 5 FS bytes used 128.00KiB
>>          devid    1 size 2.73TiB used 1.13GiB path /dev/sda
>>          devid    2 size 2.73TiB used 1.13GiB path /dev/sdb
>>          devid    3 size 2.73TiB used 1.13GiB path /dev/sdc
>>          devid    4 size 2.73TiB used 1.13GiB path /dev/sdd
>>          devid    5 size 2.73TiB used 1.13GiB path /dev/sde
>>
>>
>>  So,I want to delete this file system.
>>
>>  btrfs device delete /dev/sda /mnt/raid5.btrfs
>>
>>  But delete /dev/sda only.
>>
>>  Please Someone tell me how to delete whole this file system.
>>
>>  BRD
>>
>>  Kengo.m
>
>    "btrfs dev delete" remove a device from the SF leaving the rest of
>it intact. To destroy the filesystem completely, wipe the start of the
>device on each device. You can do that with any tool that will write
>data (dd if=/dev/zero is a popular one here), but there's a generic
>tool called wipefs that will do it for any filesystem with minimal
>writes to the device and a good level of recoverability if you get it
>wrong.
>
>    Hugo.
>
>--
>Hugo Mills             | Klytus, I'm bored. What plaything can you offer me
>hugo@... carfax.org.uk | today?
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>PGP: E2AB1DE4          |                      Ming the Merciless, Flash Gordon