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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