Thread (6 messages) 6 messages, 3 authors, 2011-06-10

RE: Backup Server RAID Array Event Notification

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From: Leslie Rhorer <hidden>
Date: 2011-06-10 17:32:00

quoted
"mdadm --monitor" does not monitor RAID0 or Linear arrays.  There is
nothing
to see.  Nothing can fail, they don't rebuilt, they are really just AID,
not
RAID.
	I've been thinking about this.  It's true they are just AID, but
they most certainly can fail.  If the array truly disappears, perhaps
because a drive fails, I certainly should be notified of it.
	That would make sense if I had started the monitor deamon and it had
sent the e-mail, but the monitor has been running for nearly two days,
since
the system was rebooted.  Why send the message nearly a day after the
deamon
is started, and why send it more than once (for each array)?

	By the same token, why did it wait nearly 8 hours and then again
more than a day and a half after the array was created to send the
messages,
instead of immediately after it was created?

	This suggests I am going to be treated to a pair of spurious e-mails
every day or so telling me the device has disappeared, when it is
perfectly
good.  After a few months of that, what happens when one of the devices
really does disappear?  We all know what happens to the system that cries,
"Wolf!" all the time.
	Yeah, it looks like it's going to send this message out once a day
for both arrays.  Mdadm sent out another pair of e-mails at 07:44 this
morning. Is no one else seeing this with RAID0 arrays?  Is there some way I
can stop it without impacting any real notifications?  I could intercept the
message in the script run by mdadm to send the e-mail, but if I do, I fear I
might also incorrectly trash a real error message.  I don't suppose
"Wrong-Level" would ever appear in a valid notification for a properly
configured system, would it?  If not, I suppose I could grep for
"Wrong-Level" in the e-mail packet and trash it if the text is found.
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