[Lustre-discuss] lustre startup sequence Re: OSTs not activating following MGS/MDS move
aurelien.degremont at cea.fr
Thu Mar 7 08:52:12 PST 2013
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.
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.
> 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.
>> and similar
>>> 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,
>>> 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.
>>> ailing list
>>> Lustre-discuss at lists.lustre.org <mailto:Lustre-discuss at lists.lustre.org>
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