Hi Guys,
I am running a raid1 btrfs with 4 disks. One of my disks died the other day. So
I replaced it with a new one. After that I tried to delete the failed (now
missing) disk. This resulted in some but not much IO and some messages like
these:
kernel: BTRFS info (device sdd): found 9 extents
kernel: [22138.202334] BTRFS info (device sdd): relocating block group
10093403832320 flags 17
Perf show this:
47.21% [kernel] [k] rb_next
29.89% [kernel] [k] comp_entry
9.54% [kernel] [k] btrfs_merge_delayed_refs
And top this:
27742 root 20 0 0 0 0 R 100.0 0.0 19:22.90 kworker/u8:7
But at one point no new messages appeared and no IO could be seen. I thought
maybe the process hung. So I rebooted the machine. After that I tried a balance
with the same result.
Here some information that might be important:
uname -a
Linux thales 4.1.5-100.fc21.x86_64 #1 SMP Tue Aug 11 00:24:23 UTC 2015 x86_64
x86_64 x86_64 GNU/Linux
###
btrfs --version
btrfs-progs v4.1
###
btrfs --version
btrfs-progs v4.1
[root@thales ~]# btrfs fi show
Label: 'data' uuid: 1f7e44b4-39ed-475d-b341-93b2e44f8f89
Total devices 5 FS bytes used 3.40TiB
devid 1 size 2.73TiB used 2.58TiB path /dev/sdb
devid 4 size 931.51GiB used 779.00GiB path /dev/sde
devid 5 size 931.51GiB used 779.00GiB path /dev/sdd
devid 6 size 5.46TiB used 379.00GiB path /dev/sda
*** Some devices missing
btrfs-progs v4.1
###
btrfs fi df /mnt/data/
Data, RAID1: total=3.46TiB, used=3.40TiB
System, RAID1: total=32.00MiB, used=528.00KiB
Metadata, RAID1: total=9.00GiB, used=7.63GiB
GlobalReserve, single: total=512.00MiB, used=15.74MiB
###
dmesg
[...]
[33209.949992] BTRFS info (device sdd): found 11 extents
[33244.802181] BTRFS info (device sdd): found 11 extents
[33247.178590] BTRFS info (device sdd): relocating block group 9826042118144
flags 20
###
Thanks for your help,
Jan
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