On Fri, Oct 26, 2012 at 5:04 PM, Phil Turmel <philip@xxxxxxxxxx> wrote: > On 10/26/2012 04:31 PM, John Drescher wrote: >> 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 > > The "Used Dev Size" must be a multiple of the target chunk size, and the > smallest allowed chunk size is 4K. > >> 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? > > Upgrading the kernel won't help. For a 4K chunk size, 1874607032 > sectors is correct. For other chunk sizes, you'll have to shrink a bit > more (1874607039 == 0x6FBC3BBF). > Thanks a lot. I understand. John -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
