Re: Moving mdadm raid volume to new OS install
Sam Martin a écrit :
>
> You mean test whether i can bring the raid vol up by booting into 64bit debian from usb?
Yes.
> i did a mdadm -e on one of the disks in the array
>
> root@HTPC-NAS:~# mdadm -E /dev/sdc1
> /dev/sdc1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 25a729b1:71f5193b:6abe8ba9:21e698f5
> Name : HTPC-NAS:0 (local to host HTPC-NAS)
> Creation Time : Thu Dec 20 12:25:56 2012
> Raid Level : raid1
> Raid Devices : 2
>
> Avail Dev Size : 5860268032 (2794.39 GiB 3000.46 GB)
> Array Size : 2930133824 (2794.39 GiB 3000.46 GB)
> Used Dev Size : 5860267648 (2794.39 GiB 3000.46 GB)
> Data Offset : 262144 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : fe1998ea:8535a654:31083985:d8c560c1
>
> Update Time : Thu Feb 7 09:01:38 2013
> Checksum : ad4320a8 - correct
> Events : 51
>
>
> Device Role : Active device 1
> Array State : AA ('A' == active, '.' == missing)
>
>
> I think the 1.2 means it's a no go in terms of running the disk independently of the raid vol.
Correct.
Actually, it should be possible to mount the filesystem on the RAID1
partition using a loop with the data offset indicated above (262144
sectors of 512 bytes), but that's getting a bit dodgy.
# mount -o ro,loop,offset=$[262144*512] /dev/sdc1 /mount/point
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