On 09/29/2017 10:00 PM, Dirk Diggler wrote:
> Hi,
>
> is there any chance to get my device removed?
I simulated a device removing in KVM with
echo 1 >/sys/block/sdj/device/delete
then
btrfs dev del 6 /mnt/....
And I got success. But I am not sure if this is the right thing todo.
You can use "btrfs replace start -r ....". But you need another device.
Otherwise, you can shutdown the filesystem, removing (physically) the disk then
remount with a "mount -o degraded ...." followed by a "btrfs dev del missing
/..."
Before doing so, please tell us which kernel you are using.
RAID5/6 until few months ago has a lot of bugs, so if you have an old kernel it
is very difficult to remove a device with success.
> Scrub literally takes months to complete (SATA 2/3 mix, about 1 minute
> per gigabyte) and i'm not sure if that helps.
> I guess same with balance. Mabye there is a quicker way. I can do
> without some data if it's corrupted. I have a backup, but i want to
> avoid to copy all data from scratch!
>
> Whenever i try to remove dev 6, i get:
>
> console:
> ERROR: error removing device '/dev/sdj': Input/output error
>
> dmesg (i/o error right after this):
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675115520
> csum 0x98f94189 expected csum 0x585e5744 mirror 1
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675119616
> csum 0x98f94189 expected csum 0xcefd2ae0 mirror 1
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675115520
> csum 0x98f94189 expected csum 0x585e5744 mirror 1
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675119616
> csum 0x98f94189 expected csum 0xcefd2ae0 mirror 1
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675115520
> csum 0x4023cac1 expected csum 0x585e5744 mirror 2
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675119616
> csum 0xea91b663 expected csum 0xcefd2ae0 mirror 2
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675115520
> csum 0x98f94189 expected csum 0x585e5744 mirror 1
> BTRFS warning (device sdl): csum failed root -9 ino 365 off 3675115520
> csum 0x4023cac1 expected csum 0x585e5744 mirror 2
>
> My setup:
> /dev/sdf, ID: 3
> Device size: 2.73TiB
> Device slack: 0.00B
> Data,RAID5: 333.00GiB
> Data,RAID5: 5.00GiB
> Unallocated: 2.40TiB
>
> /dev/sdg, ID: 2
> Device size: 1.82TiB
> Device slack: 0.00B
> Data,RAID5: 333.00GiB
> Data,RAID5: 955.00GiB
> Data,RAID5: 5.57GiB
> Metadata,RAID1: 3.00GiB
> Unallocated: 566.44GiB
>
> /dev/sdh, ID: 4
> Device size: 1.82TiB
> Device slack: 0.00B
> Data,RAID5: 333.00GiB
> Data,RAID5: 955.00GiB
> Data,RAID5: 5.57GiB
> Metadata,RAID1: 2.00GiB
> System,RAID1: 32.00MiB
> Unallocated: 567.41GiB
>
> /dev/sdi, ID: 7
> Device size: 2.73TiB
> Device slack: 0.00B
> Data,RAID5: 333.00GiB
> Data,RAID5: 955.00GiB
> Data,RAID5: 5.57GiB
> Metadata,RAID1: 11.00GiB
> System,RAID1: 32.00MiB
> Unallocated: 1.45TiB
>
> /dev/sdj, ID: 6
> Device size: 465.76GiB
> Device slack: 0.00B
> Data,RAID5: 333.00GiB
> Data,RAID5: 587.38MiB
> Unallocated: 132.19GiB
>
> /dev/sdk, ID: 1
> Device size: 1.82TiB
> Device slack: 0.00B
> Data,RAID5: 333.00GiB
> Data,RAID5: 955.00GiB
> Data,RAID5: 5.57GiB
> Metadata,RAID1: 3.00GiB
> Unallocated: 566.44GiB
>
> /dev/sdl, ID: 5
> Device size: 1.82TiB
> Device slack: 0.00B
> Data,RAID5: 333.00GiB
> Data,RAID5: 955.00GiB
> Data,RAID5: 5.57GiB
> Metadata,RAID1: 3.00GiB
> Unallocated: 566.44GiB
>
> Thanks,
> DocMAX
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