From: "Helmut Hullen" <Hullen@t-online.de>
To: linux-btrfs@vger.kernel.org
Subject: Re: How to remove a device on a RAID-1 before replacing it?
Date: 29 Mar 2011 22:45:00 +0200 [thread overview]
Message-ID: <BilctUzD1uB@helmut.hullen.de> (raw)
In-Reply-To: <AANLkTi=SiesmPbkwoCHSpxDaLK_S8EcZEbBBtVFZUV_j@mail.gmail.com>
Hallo, cwillu,
Du meintest am 29.03.11:
>> I have a disk with a SMART failure. =A0It still works but I assume
>> it'll fail sooner or later.
>>
>> I want to remove it from my btrfs volume, replace it, and add the
>> new one. =A0But the obvious command doesn't work:
[...]
> There's no "nice" way to remove a failing disk in btrfs right now
> ("btrfs dev delete" is more of a online management thing to politely
> remove a perfectly functional disk you'd like to use for something
> else.)
Nice hope, but even "btrfs device delete /dev/sdxn /mnt/btr" doesn't =20
work well.
I've tried it, with kernel 2.6.38.1 ...
# mkfs.btrfs -L SCSI -m raid0 /dev/sda1
# mount LABEL=3DSCSI /mnt/btr
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 1 FS bytes used 28.00KB
devid 1 size 4.04GB used 20.00MB path /dev/sda1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data: total=3D8.00MB, used=3D0.00
System: total=3D4.00MB, used=3D8.00KB
Metadata: total=3D8.00MB, used=3D20.00KB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 4232556 28 4220224 1% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
# btrfs device add /dev/sdc1 /mnt/btr
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 2 FS bytes used 28.00KB
devid 1 size 4.04GB used 433.31MB path /dev/sda1
devid 2 size 8.54GB used 0.00 path /dev/sdc1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data: total=3D421.31MB, used=3D0.00
System: total=3D4.00MB, used=3D4.00KB
Metadata: total=3D8.00MB, used=3D24.00KB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 13189632 28 13176256 1% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
/dev/sdc
1 2048 17916206 8.5 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
# 2 GByte kopiert
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 2 FS bytes used 2.10GB
devid 1 size 4.04GB used 433.31MB path /dev/sda1
devid 2 size 8.54GB used 2.25GB path /dev/sdc1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data: total=3D2.41GB, used=3D2.10GB
System: total=3D4.00MB, used=3D4.00KB
Metadata: total=3D264.00MB, used=3D2.79MB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 13189632 2202740 10714232 18% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
/dev/sdc
1 2048 17916206 8.5 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
# 7 GByte kopiert
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 2 FS bytes used 9.03GB
devid 1 size 4.04GB used 1.42GB path /dev/sda1
devid 2 size 8.54GB used 8.25GB path /dev/sdc1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data: total=3D9.41GB, used=3D9.02GB
System: total=3D4.00MB, used=3D4.00KB
Metadata: total=3D264.00MB, used=3D11.80MB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 13189632 9467164 3459032 74% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
/dev/sdc
1 2048 17916206 8.5 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
# btrfs device add /dev/sdb1 /mnt/btr
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 3 FS bytes used 9.12GB
devid 3 size 136.73GB used 0.00 path /dev/sdb1
devid 1 size 4.04GB used 1.42GB path /dev/sda1
devid 2 size 8.54GB used 8.25GB path /dev/sdc1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data: total=3D9.41GB, used=3D9.10GB
System: total=3D4.00MB, used=3D4.00KB
Metadata: total=3D264.00MB, used=3D11.91MB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 156562592 9559000 146739216 7% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
/dev/sdc
1 2048 17916206 8.5 GiB 0700 Linux/Windows =
data
/dev/sdb
1 2048 286747966 136.7 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
# btrfs filesystem balance /mnt/btr
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 3 FS bytes used 9.11GB
devid 3 size 136.73GB used 10.61GB path /dev/sdb1
devid 1 size 4.04GB used 3.70GB path /dev/sda1
devid 2 size 8.54GB used 8.08GB path /dev/sdc1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=3D21.89GB, used=3D9.10GB
System: total=3D4.00MB, used=3D4.00KB
Metadata, RAID0: total=3D511.88MB, used=3D10.15MB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 156562592 9557196 14370128 40% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
/dev/sdc
1 2048 17916206 8.5 GiB 0700 Linux/Windows =
data
/dev/sdb
1 2048 286747966 136.7 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
# 8 GByte kopiert
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 3 FS bytes used 17.02GB
devid 3 size 136.73GB used 10.61GB path /dev/sdb1
devid 1 size 4.04GB used 3.70GB path /dev/sda1
devid 2 size 8.54GB used 8.08GB path /dev/sdc1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=3D21.89GB, used=3D17.00GB
System: total=3D4.00MB, used=3D4.00KB
Metadata, RAID0: total=3D511.88MB, used=3D18.66MB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 156562592 17850436 6085608 75% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
/dev/sdc
1 2048 17916206 8.5 GiB 0700 Linux/Windows =
data
/dev/sdb
1 2048 286747966 136.7 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
# btrfs filesystem balance /mnt/btr
# btrfs filesystem show
Label: 'SCSI' uuid: 4d834705-5a65-4d1f-a8a0-a5ea9348db50
Total devices 3 FS bytes used 17.08GB
devid 3 size 136.73GB used 9.08GB path /dev/sdb1
devid 1 size 4.04GB used 2.09GB path /dev/sda1
devid 2 size 8.54GB used 8.08GB path /dev/sdc1
Btrfs Btrfs v0.19
# btrfs filesystem df /mnt/btr
Data, RAID0: total=3D19.00GB, used=3D17.06GB
System: total=3D4.00MB, used=3D4.00KB
Metadata, RAID0: total=3D255.94MB, used=3D18.51MB
# df -t btrfs
=46ilesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda1 btrfs 156562592 17911352 6118356 75% /mnt/btr
# gdisk -l
/dev/sda
1 2048 8467166 4.0 GiB 0700 Linux/Windows =
data
/dev/sdc
1 2048 17916206 8.5 GiB 0700 Linux/Windows =
data
/dev/sdb
1 2048 286747966 136.7 GiB 0700 Linux/Windows =
data
#------------------------------------------------------------
and then follows the problem I've told last year: "no space left on =20
device ...". In this special case: even not enough place for deleting =20
one partition.
Trying "btrfs device delete ..." without previous "balance" leads to
# btrfs device delete /dev/sdc1 /mnt/btr
# endet mit "error removing the device '/dev/sdc1'"
Viele Gruesse!
Helmut
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next prev parent reply other threads:[~2011-03-29 20:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-29 20:09 How to remove a device on a RAID-1 before replacing it? Andrew Lutomirski
2011-03-29 20:21 ` cwillu
2011-03-29 20:45 ` Helmut Hullen [this message]
2011-03-29 21:01 ` Andrew Lutomirski
2011-03-29 21:15 ` Hugo Mills
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