[Lustre-discuss] Proper shutdown sans clients

[Lee, Brett]

Scott,

What is preventing the clients from being shut down?  Unable to unmount the file system?  If that is the case, please try "umount -f" instead of umount.  This will result in an unclean unmount, but the client *will* be able to unmount Lustre.  If other, please advise.

Regarding the order of shutdown, I've been advocating:

Clients
MDT
OSTs

As the MDS is a client of the OSTs (the MDS runs an OSC for each OST).

However, using this method has seemingly triggered the recovery process on targets when bringing up the file system.

I understand that in version 2.4, OSSs will need to communicate with the MDSs, seemingly creating a two way dependency (possibly my confusion on the matter, but clarification here is requested ).  However, as you are using 1.8.7, this latter point should not cause you any problems.

--
Brett Lee
Sr. Systems Engineer
Intel High Performance Data Division


> -----Original Message-----
> From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-
> bounces at lists.lustre.org] On Behalf Of K. Scott Rowe
> Sent: Tuesday, October 22, 2013 8:51 AM
> To: lustre-discuss at lists.lustre.org
> Subject: [Lustre-discuss] Proper shutdown sans clients
> 
> 
> We use Lustre 1.8.7.  Our environment has many Lustre clients spread out
> accross several networks.  When an emergency happes, like a power outage,
> where we need to quickly shutdown the Lustre servers we frequently are
> unable to shutdown the clients first.  I know that the documentation
> recommends shutting down Lustre in this order:
> 
>   unmount clients
>   unmount MDT
>   unmount OSTs
> 
> So my question is, what would the recommended procedure be if one cannot
> shutdown all the clients first?  Would it just be
> 
>   unmount MDT
>   unmount OSTs
> 
> Or is there something else that should be done because we cannot get the
> clients shutdown first?
> 
> --
> K. Scott Rowe -- Linux Grouop Lead
> Array Operations Center, National Radio Astronomy Observatory
> krowe at nrao.edu -- http://www.aoc.nrao.edu/~krowe/
> 1.575.835.7000 -- 1003 Lopezville Socorro, NM 87801
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