On 07/21/2017 12:00 AM, NeilBrown wrote:
On Mon, Jul 17 2017, Veljko wrote:
On 07/15/2017 02:12 AM, NeilBrown wrote:
So command should be
dd if=/dev/md2 of=SOMEWHERE/SAFE bs=1M skip=5626590
and expect it to create a 3M file.
Use this 'skip' number of the 'seek' number later.
NeilBrown
Thanks, Neil, now it makes more sense.
I tried to create new linear device, but mdadm is complaining about
data-offset:
# mdadm -C /dev/md4 -l linear -n 2 --rounding=1M -e 1.0 --data-offset=0
/dev/md2 /dev/md3
mdadm: invalid data-offset: 0
Bother.
mdadm uses "parse_size()" to parse the offset, and this rejects
"0", which makes sense for a size, but not for an offset.
Just leave the "--data-offset=0" out. I checked and that is defintely
the default for 1.0.
I noticed that md2 and md3 use 1.2 metadata. Can that be the issue?
No the metadata on md4 is quite independent of the metadata on md2 and md3.
NeilBrown
Yes, now it works. I was able to create new linear device, restored the
saved 3M file and grown xfs. It was really fast and indeed, I'm happy.
Thank you very much, Neil!
Regards,
Veljko
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