Am 26.02.2017 um 19:51 schrieb Andy Smith:
On Sun, Feb 26, 2017 at 03:37:24PM +0100, Reindl Harald wrote:
is it somehow possible to change a existing md RAID10 array from "2
near-copies" to "2 far-copies" and what would be the mdadm syntax?
https://manpages.debian.org/jessie/mdadm/mdadm.8.en.html suggests
that --grow --layout can be changed on RAID-10. I have never tried
it myself. Experiment with loop devices. It looks like the syntax
would be:
# mdadm --grow /dev/mdX --layout=f2
thanks for your answer
the syntax seems to be correct given the error message says clear
"Cannot reshape RAID10 to far-mode" which sadly answers the question -
at least for now, maybe that will change in the future
[root@testserver:~]$ mdadm --grow /dev/md0 --layout=f2
mdadm: Cannot reshape RAID10 to far-mode
[root@testserver:~]$ rpm -q mdadm
mdadm-3.4-3.fc24.x86_64
[root@testserver:~]$ uname -a
Linux testserver.rhsoft.net 4.9.12-100.fc24.x86_64 #1 SMP Thu Feb 23
21:29:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
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