[Lustre-discuss] lustre startup sequence Re: OSTs not activating following MGS/MDS move

[DEGREMONT Aurelien]

Hello

AFAIK there is 2 orders:
  - If you are started your filesystem for the first time (or using 
--writeconf), order is :
MGS, MDS, OST, Clients
  - On normal start
MGS, OST, MDS, Clients

There is a patch on some recent Lustre release to be able to use the 
first order any time but I would advise to use the second one anyway as 
it avoids starting MDS first, lacking connection to OST, and then 
reconnecting to them when they are really started.


Aurélien


Le 07/03/2013 17:48, Colin Faber a écrit :
> Hi Yes,
>
> Thanks for finding this Alex. The manual should be updated with the
> correct order.
>
> -cf
>
>
>
> On 03/07/2013 09:39 AM, Alex Kulyavtsev wrote:
>> Hi Colin.
>> This is not what the manual says.
>>
>> Shall it be corrected then? Or, add description for startup sequence
>> in different situations (first start, restart).
>>
>> The manual (or online information) does not describe graceful shutdown
>> sequence for separate MGS/MDT configuration, it will be nice to add
>> that too.
>>
>> Alex.
>>
>> E.g.
>> http://wiki.lustre.org/manual/LustreManual20_HTML/LustreOperations.html#50438194_24122
>> and similar
>> http://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.xhtml#dbdoclet.50438194_24122
>>>
>>>      13.2 Starting Lustre
>>>
>>> The startup order of Lustre components depends on whether you have a
>>> combined MGS/MDT or these components are separate.
>>>
>>>    * If you have a combined MGS/MDT, the recommended startup order is
>>>      OSTs, then the MGS/MDT, and then clients.
>>>
>>>    * If the MGS and MDT are separate, the recommended startup order
>>>      is: *MGS, then OSTs, then the MDT, and then clients.*
>>>
>>
>>
>> On Mar 7, 2013, at 9:51 AM, Colin Faber wrote:
>>
>>> Hi Christopher,
>>>
>>> In general this can happen when your initial remount of the various
>>> services is in thewrong order.
>>>
>>> Such as MGS -> OST -> MDT -> Client. or MGS -> MDT -> Clients -> OST,
>>> etc.
>>>
>>> During initial mount and registration it's critical that your mount be
>>> in the correct order:
>>>
>>> MGS -> MDT -> OST(s) -> Client(s)
>>>
>>> CATALOG corruption, or out of order sequence is more rare on active file
>>> system, but is possible. The simple fix here as described below is to
>>> just truncate it and all should be well again.
>>>
>>> -cf
>>>
>>> ailing list
>>> Lustre-discuss at lists.lustre.org <mailto:Lustre-discuss at lists.lustre.org>
>>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>>
>>
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