On 11/09/2011 01:55 PM, Phil Turmel wrote:
Hi William,
On 11/09/2011 12:12 PM, William Colls wrote:
[...]
I thought, at the time, that I needed to do the create so that the /dev/md0 device would be created properly (new machine had no raid before).
That's the "--auto" option, which has sane defaults.
[...]
No output from the original setup.
From what you've described so far, a likely possibility is that the original raid 1 was using metadata version 1.1 or 1.2, which put the superblock near the beginning of the disks. The default "--create" metadata in that old version of mdadm is 0.9, as you can see in your reports.
If so, you've likely only lost a tiny bit of data at the end of the volumes where the 0.90 superblock has been written. (I'm also going to assume that the two disks were in-sync in old box before you moved them, so the re-sync wouldn't do any harm.)
A dump of the first 8K of your drives might be helpful here.
dd if=/dev/sdb count=16 2>/dev/null |hexdump -C
dd if=/dev/sdc count=16 2>/dev/null |hexdump -C
Regards,
Phil
Did the dumps to text files. diff shows no difference between the files.
Should I be looking for anything particular? There are sections which
seem to have data, and several blocks that are all zeros, but I don't
see any particular patterns, and only a very few obvious text strings.
Thanks for your interest and help.
--
I know you believe that you understand what you think I said, but I am
not sure that you realize that what you heard was not what I ment.
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