Am 04.11.2017 um 22:54 schrieb Wols Lists:
On 04/11/17 20:36, Reindl Harald wrote:
While the system is RUNNING, yes. But if the array is STOPPED, mdadm
will refuse to start it. At least, that's certainly how I understand
it works ...
Do you REALLY want the system to be running, and give you no clue that
it's not working properly?
mdmon typically writes a mail about a degraded array - so far away from
"no clue"
mdmon? What's that? Yes, I know, it's the monitor. But how do you know
whether or not it's running? It certainly isn't on my system.
but it should and it#s the responsibility of the admin to ensue it runs
and it#s mails are properly routed so that you receive them
-------- Weitergeleitete Nachricht --------
Betreff: Fail event on /dev/md0:srv-rhsoft.rhsoft.net
Datum: Wed, 3 Dec 2014 11:32:35 +0100 (CET)
Von: mdadm monitoring <root@xxxxxxxxxxxxxxxxxxxxx>
An: root@xxxxxxxxxxxxxxxxxxxxx
This is an automatically generated mail message from mdadm
running on srv-rhsoft.rhsoft.net
A Fail event had been detected on md device /dev/md0.
It could be related to component device /dev/sdb1.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
md0 : active raid1 sda1[4] sdb1[3](F) sdd1[0] sdc1[5]
511988 blocks super 1.0 [4/3] [UUU_]
unused devices: <none>
Anyways, as I said, as far as I am aware, "mdadm --run" does NOT work on
a degraded array unless either the previous --run was on a degraded
array, or you use --force.
Which means if you remove a disk from an array, and then try to restart
the array, the restart will fail. Which is exactly the OP's scenario
and that's what i do not get in general - why should a array not start
in whatever situation if it has enough drives to do so?
i don't get why a mirrored array should stop at all just becsue it is
degraded but maybe we talk about completly different things
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