Hi all,
Hate to bump a thread but have I missed any information that would help to get me help :)?
Neil,
as far as the default chunk sizes and mdadm versions are concerned, I am guessing you may be amongst the few who would know that conclusively? Also could the data offset and super offset be significant?
Thanks,
Anshu
On 22-Jun-2012, at 5:50 PM, Anshuman Aggarwal wrote:
> Hi,
> I have a 6 device raid 5 array which had 1 disk go bad and then due to a power outage, the machine shutdown and when it started all the disks were showing up as spares with the following mdadm -E output (sample for one given below and full for all devices attached).
>
> This md device was part a Physical Volume for a LVM Volume Group.
>
> I am trying to recreate the array using mdadm --create --assume-clean using 1 device as missing. I am checking if the device is getting created correctly by checking the UUID of the created device which would match if the device gets created correctly.
>
> I have tried a few combinations of the disk order that I believe is right however I think I'm getting tripped up by the fact that the mdadm I used to create this md device was some 2.x series and now we are on 3.x (and I may have taken some of the defaults originally which I don't' remember)
> What all 'defaults' have changed over the versions so I can try those? Like chunk size? Can we manually configure the super/data offset? Are those significant when we do an mdadm --create --assume-clean?
>
> Thanks,
> Anshu
>
> /dev/sda5:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : b480fe0c:c9e29256:0fcf1b0c:1f8c762c
> Name : GATEWAY:RAID5_500G
> Creation Time : Wed Apr 28 16:10:43 2010
> Raid Level : -unknown-
> Raid Devices : 0
>
> Avail Dev Size : 976768002 (465.76 GiB 500.11 GB)
> Used Dev Size : 976765954 (465.76 GiB 500.10 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : active
> Device UUID : a8499a91:628ddde8:1cc8f4b9:749136f9
>
> Update Time : Sat May 19 23:04:23 2012
> Checksum : 9950883c - correct
> Events : 1
>
>
> Device Role : spare
> Array State : ('A' == active, '.' == missing)
>
> <md5.txt>
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