Re: Mdadm monitor sometimes doesn't send events.

On 30.04.2013 03:48, NeilBrown wrote:

On Mon, 29 Apr 2013 10:52:57 +0200 Arkadiusz Bubała
[off-list ref]  wrote:

   

quoted

Hello,
We've got a problem that sometimes mdadm monitor doesn't send events.
Actions are as follows:

start:
create new RAID 5 array
wait until it's rebuilding
stop created array
go to start

Only first time we get "NewArray" event then when new array is created
only "RebuildStarted" event appears. After our analysis we found out
that when we stop an array we get "DeviceDisapeared" event and when we
create a new array we get "RebuildFinished" and then "RebuildStarted"
event. Sometimes those two events don't show up.
     

The missing NewArray messages was fixed in June last year by
commit 0f760384ebc92d81a988c1501e4a493ef064ad66

You are using a very old mdadm.  Maybe you should try 3.2.6

I'm less sure about the RebuildStarted/RebuildFinished oddities but there is
a good chance they are fixed is the latest release too.

NeilBrown

   

Thank you,
I'm testing this on 3.2.6 and it seems to work well. Events don't 
dissapear. We thought that lack of "NewArray" event may be intended.

Could you answer these questions, please:

Do we need to restart mdadm monitor when new disk is added to the system 
(hotplug)?

Do we need to generate config file in such situation or running mdadm 
with option --scan is sufficient?

-- 
Best regards
Arkadiusz Bubała
Open-E Poland Sp. z o.o.
www.open-e.com

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