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

[Colin Faber]

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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