Re: Mdadm monitor sometimes doesn't send events.

["Arkadiusz Bubała" <arkadiusz.bubala@open-e.com>]

On 30.04.2013 03:48, NeilBrown wrote:
> On Mon, 29 Apr 2013 10:52:57 +0200 Arkadiusz Bubała
> <arkadiusz.bubala@open-e.com>  wrote:
>
>    
>> 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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