Am 26.02.2017 um 22:17 schrieb Andy Smith:
Hi,
On Sun, Feb 26, 2017 at 09:28:34PM +0100, Reindl Harald wrote:
Am 26.02.2017 um 19:51 schrieb Andy Smith:
https://manpages.debian.org/jessie/mdadm/mdadm.8.en.html suggests
that --grow --layout can be changed on RAID-10.
[…]
[root@testserver:~]$ mdadm --grow /dev/md0 --layout=f2
mdadm: Cannot reshape RAID10 to far-mode
Hmm, that man page says that Debian jessie has version 3.3.2-5 and
still it says:
…changing the chunk size and layout for RAID 0,4,5,6,10 as well
as adding or removing a write-intent bitmap.
So is the man page wrong?
Admittedly until I looked I thought RAID-10 couldn't be reshaped at
all in any way. And now I don't know at all. :)
well, change to "offset" seems to be supported (also not that long at
all) if there is enough room and Google round confirms that
[root@testserver:~]$ mdadm --grow /dev/md0 --layout=o2
mdadm: insufficient head-room on /dev/sdg1
with the knowledge from today i would have chosen RAID1+0 or two RAID1
and LVM stripe on top at least for the data partitions which would
support the current 4 disk setup with "writemostly" and so achieve the
full read performance out of the two SSD instead need another 2 SSD
disks or build the raid-setup from scratch, both not making me terrible
happy :-)
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