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Re: Data Offset | |
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On Fri, 1 Jun 2012 18:22:33 -0500 freeone3000 <freeone3000@xxxxxxxxx> wrote:
> Hello. I have an issue concerning a broken RAID of unsure pedigree.
> Examining the drives tells me the block sizes are not the same, as
> listed in the email.
>
> > I certainly won't be easy. Though if someone did find themselves in that
> > situation it might motivate me to enhance mdadm in some way to make it easily
> > fixable.
>
> I seem to be your motivation for making this situation fixable.
> Somehow I managed to get drives with an invalid block size. All worked
> fine until a drive dropped out of the RAID5. When attempting to
> replace, I can re-create the RAID, but it cannot be of the same size
> because the 1024-sector drives are "too small" when changed to
> 2048-sector, exactly as described. Are there any recovery options I
> could try, including simply editing the header?
You seem to be leaving out some important information.
The "mdadm --examine" of all the drives is good - thanks - but what exactly
if your problem, and what were you trying to do?
You appear to have a 5-device RAID5 of which one device (sde3) fell out of
the array on or shortly after 23rd May, 3 drives are working fine, and one -
sdf (not sdf3??) - is a confused spare....
What exactly did you do to sdf?
NeilBrown
>
>
> mdadm --examine of all drives in the RAID:
>
> /dev/sdb3:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 9759ad94:75e30b6b:8a726b4d:177a6eda
> Name : leyline:1 (local to host leyline)
> Creation Time : Mon Sep 12 13:19:00 2011
> Raid Level : raid5
> Raid Devices : 5
>
> Avail Dev Size : 3906525098 (1862.78 GiB 2000.14 GB)
> Array Size : 15626096640 (7451.10 GiB 8000.56 GB)
> Used Dev Size : 3906524160 (1862.78 GiB 2000.14 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 872097fa:3ae66ab4:ed21256a:10a030c9
>
> Update Time : Fri Jun 1 03:11:54 2012
> Checksum : 6d627f7a - correct
> Events : 2127454
>
> Layout : left-symmetric
> Chunk Size : 512K
>
> Device Role : Active device 1
> Array State : AAAA. ('A' == active, '.' == missing)
>
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 9759ad94:75e30b6b:8a726b4d:177a6eda
> Name : leyline:1 (local to host leyline)
> Creation Time : Mon Sep 12 13:19:00 2011
> Raid Level : raid5
> Raid Devices : 5
>
> Avail Dev Size : 3906525098 (1862.78 GiB 2000.14 GB)
> Array Size : 15626096640 (7451.10 GiB 8000.56 GB)
> Used Dev Size : 3906524160 (1862.78 GiB 2000.14 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 2ea285a1:a2342c24:ffec56a2:ba6fcf07
>
> Update Time : Fri Jun 1 03:11:54 2012
> Checksum : fae2ea42 - correct
> Events : 2127454
>
> Layout : left-symmetric
> Chunk Size : 512K
>
> Device Role : Active device 0
> Array State : AAAA. ('A' == active, '.' == missing)
>
> /dev/sdc3:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 9759ad94:75e30b6b:8a726b4d:177a6eda
> Name : leyline:1 (local to host leyline)
> Creation Time : Mon Sep 12 13:19:00 2011
> Raid Level : raid5
> Raid Devices : 5
>
> Avail Dev Size : 3906525098 (1862.78 GiB 2000.14 GB)
> Array Size : 15626096640 (7451.10 GiB 8000.56 GB)
> Used Dev Size : 3906524160 (1862.78 GiB 2000.14 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 2ea285a1:a2342c24:ffec56a2:ba6fcf07
>
> Update Time : Fri Jun 1 03:11:54 2012
> Checksum : fae2ea42 - correct
> Events : 2127454
>
> Layout : left-symmetric
> Chunk Size : 512K
>
> Device Role : Active device 0
> Array State : AAAA. ('A' == active, '.' == missing)
>
>
> /dev/sdd3:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 9759ad94:75e30b6b:8a726b4d:177a6eda
> Name : leyline:1 (local to host leyline)
> Creation Time : Mon Sep 12 13:19:00 2011
> Raid Level : raid5
> Raid Devices : 5
>
> Avail Dev Size : 3906524160 (1862.78 GiB 2000.14 GB)
> Array Size : 15626096640 (7451.10 GiB 8000.56 GB)
> Data Offset : 1024 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 8d656a1d:bbb1da37:edaf4011:1af2bbb9
>
> Update Time : Fri Jun 1 03:11:54 2012
> Checksum : ab4c6863 - correct
> Events : 2127454
>
> Layout : left-symmetric
> Chunk Size : 512K
>
> Device Role : Active device 3
> Array State : AAAA. ('A' == active, '.' == missing)
>
> /dev/sde3:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 9759ad94:75e30b6b:8a726b4d:177a6eda
> Name : leyline:1 (local to host leyline)
> Creation Time : Mon Sep 12 13:19:00 2011
> Raid Level : raid5
> Raid Devices : 5
>
> Avail Dev Size : 3906524160 (1862.78 GiB 2000.14 GB)
> Array Size : 15626096640 (7451.10 GiB 8000.56 GB)
> Data Offset : 1024 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 37bb83bd:313c9381:cabff9d0:60bd205c
>
> Update Time : Wed May 23 03:30:50 2012
> Checksum : f72e6959 - correct
> Events : 2004256
>
> Layout : left-symmetric
> Chunk Size : 512K
>
> Device Role : spare
> Array State : AAAA. ('A' == active, '.' == missing)
>
> /dev/sdf:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 9759ad94:75e30b6b:8a726b4d:177a6eda
> Name : leyline:1 (local to host leyline)
> Creation Time : Mon Sep 12 13:19:00 2011
> Raid Level : raid5
> Raid Devices : 5
>
> Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
> Array Size : 15626096640 (7451.10 GiB 8000.56 GB)
> Used Dev Size : 3906524160 (1862.78 GiB 2000.14 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : e16d4103:cd11cc3b:bb6ee12e:5ad0a6e9
>
> Update Time : Fri Jun 1 03:11:54 2012
> Checksum : e287a82a - correct
> Events : 0
>
> Layout : left-symmetric
> Chunk Size : 512K
>
> Device Role : spare
> Array State : AAAA. ('A' == active, '.' == missing)
>
> --
> James Moore
>
> --
> James Moore
> --
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