[Lustre-discuss] forced umount of OST in failover case?

[Nathaniel Rutman]

Erich Focht wrote:
> Hi,
>
> the lustre manual says:
>
>  2.2.1.5 Stopping a Server
>  To stop a server:
>  $ umount -f /mnt/test/ost0
>  The '-f' flag means "force"; force the server to stop WITHOUT RECOVERY. 
>  Without the '-f' flag, "failover" is
>  implied, meaning the next time the server is started it goes through the 
>  recovery procedure.
>
> So we were tempted to use "umount -f" when doing a failover of OSTs, but we
> see problems (I/O errors on clients) during the failover when doing this.
> Without the "-f" flag we get no I/O errors.
>   
yes.  That is the difference between "forced" or not.  Forced means stop 
with errors for clients, unforced means take more time and do recovery 
at restart.
> Is there a recommended way of dealing with the umount at failover?
>   
Don't use -f
> Best regards,
> Erich
>
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