On 08/01/18 15:25, Gandalf Corvotempesta wrote:
2018-01-08 16:20 GMT+01:00 Wols Lists <antlists@xxxxxxxxxxxxxxx>:
Okay, you need spare ports to do a --replace so it's not always
possible, but it's always desirable. And with enough spare ports, you
can replace more than one drive at once, again with NO loss of redundancy.
I have 3 ports available, so I can replace 3 disks at once.
Any hint on the exact command so that I can safely test on a test server ?
Search the man page for --replace, but (off the top of my head) I think
it's as simple as
mdadm /dev/md0 --add /dev/sdg --replace /dev/sdc
or
mdadm /dev/md0 --add /dev/sdg /dev/sdh /dev/sdi /dev/sdj --replace
/dev/sdc /dev/sdd /dev/sde /dev/sdf
The man page says that the --replace option tells the raid code to
failover the selected device as soon as a spare becomes available, so
using --add --replace gives it the spare and tells it to use it.
With this number of devices to play with, I'd make sure to make a note
of the original UUIDs and use those where possible - if linux plays with
your sdx or you muddle your cables or whatever, then you could easily
make an array-damaging typo ...
Cheers,
Wol
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