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

Alex Kulyavtsev aik at fnal.gov
Thu Mar 7 08:39:24 PST 2013

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 the wrong 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
> http://lists.lustre.org/mailman/listinfo/lustre-discuss

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