I got the following message when trying to convert a 2 disk raid1 to a
6 disk raid 6 in a 3.3.8 kernel:
fileserver1 btrfs-root # mdadm --grow /dev/md3 --level=6 --raid-devices=6
mdadm: Cannot convert RAID1 of this size - reduce size to multiple of 4K first.
Fileserver1 btrfs-root # uname -a
Linux fileserver1 3.3.8-gentoo-fileserver1-raid1 #3 SMP Thu Jul 12
20:06:18 EDT 2012 x86_64 Intel(R) Xeon(R) CPU E31230 @ 3.20GHz
GenuineIntel GNU/Linux
fileserver1 btrfs-root # mdadm --version
mdadm - v3.2.6 - 25th October 2012
fileserver1 btrfs-root # mdadm -D /dev/md3
/dev/md3:
Version : 1.2
Creation Time : Wed Sep 28 16:03:56 2011
Raid Level : raid1
Array Size : 1874607039 (1787.76 GiB 1919.60 GB)
Used Dev Size : 1874607039 (1787.76 GiB 1919.60 GB)
Raid Devices : 2
Total Devices : 6
Persistence : Superblock is persistent
Update Time : Fri Oct 26 16:24:22 2012
State : clean
Active Devices : 2
Working Devices : 6
Failed Devices : 0
Spare Devices : 4
Name : fileserver1:3 (local to host fileserver1)
UUID : df2200d4:3ba5d29c:524dc437:35d663ea
Events : 785
Number Major Minor RaidDevice State
0 8 116 0 active sync /dev/sdh4
1 8 4 1 active sync /dev/sda4
2 8 244 - spare /dev/sdp4
3 8 196 - spare /dev/sdm4
4 8 212 - spare /dev/sdn4
5 8 228 - spare /dev/sdo4
Would upgrading the kernel avoid needing to reduce the size of the
array? If not I assume I have to reduce the size of the btrfs
filesystem then resize the array to 1874604032. Is that correct?
--
John M. Drescher
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