...Hi all,
$ sudo mdadm --create /dev/md0 --level=5 --raid-devices=6 /dev/loop[0-5]
$ sudo mdadm --create /dev/md0 --force --level=5 --raid-devices=6 /dev/loop[0-5]
Seems to give what I expected (a raid5 pool with 6 devices, no spare).
From mdadm man page :
"...When creating a RAID5 array, mdadm will automatically create a degraded array with an extra spare drive. This is because building the spare into a degraded array is in general faster than resyncing the parity on a non-degraded, but not clean, array. This feature can be over-ridden with the -I --force option."
"-I" doesn't seems to be understood by mdadm. Leftover ?
I don't understand what the previous extract from the man page means. My understanding is that the default behaviour of mdadm is to create a raid5 pool in degraded mode aka with a missing drive ? Is this correct ?
after
$ sudo mdadm --create /dev/md0 --force --level=5 --raid-devices=6 /dev/loop[0-5]
the state of the array is dirty. Why ?
$ sudo mdadm --stop /dev/md0 followed by $ sudo mdadm --examine /dev/loop[0-5]
gives a clean state for each device but
$ sudo mdadm --assemble /dev/md0 /dev/loop[0-5] keeps the dirty state of the array.
Thanks,
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