* mdadm: Cannot convert RAID1 of this size - reduce size to multiple of 4K first.
@ 2012-10-26 20:31 John Drescher
2012-10-26 21:04 ` Phil Turmel
0 siblings, 1 reply; 3+ messages in thread
From: John Drescher @ 2012-10-26 20:31 UTC (permalink / raw)
To: linux-raid
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
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: mdadm: Cannot convert RAID1 of this size - reduce size to multiple of 4K first.
2012-10-26 20:31 mdadm: Cannot convert RAID1 of this size - reduce size to multiple of 4K first John Drescher
@ 2012-10-26 21:04 ` Phil Turmel
2012-10-26 22:36 ` John Drescher
0 siblings, 1 reply; 3+ messages in thread
From: Phil Turmel @ 2012-10-26 21:04 UTC (permalink / raw)
To: John Drescher; +Cc: linux-raid
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).
HTH,
Phil
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: mdadm: Cannot convert RAID1 of this size - reduce size to multiple of 4K first.
2012-10-26 21:04 ` Phil Turmel
@ 2012-10-26 22:36 ` John Drescher
0 siblings, 0 replies; 3+ messages in thread
From: John Drescher @ 2012-10-26 22:36 UTC (permalink / raw)
To: Phil Turmel; +Cc: linux-raid
On Fri, Oct 26, 2012 at 5:04 PM, Phil Turmel <philip@turmel.org> 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
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2012-10-26 22:36 UTC | newest]
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2012-10-26 20:31 mdadm: Cannot convert RAID1 of this size - reduce size to multiple of 4K first John Drescher
2012-10-26 21:04 ` Phil Turmel
2012-10-26 22:36 ` John Drescher
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