[Lustre-discuss] umounting server with or without failover

[Andreas Dilger]

On 2010-05-31, at 19:20, Wojciech Turek wrote:
> Please find below a snippets from Lustre-1.8 manual regarding server
> umount with our without failover (-f option). As you can see 4.3.4
> contardics 4.5.1 and 4.5.2. Has something changed or is it a manual
> BUG?

I think that 4.3 is correct, and 4.5 is incorrect.

> 4.3.4  Unmounting a Server
> To stop a Lustre server, use the umount <mount point> command.
> For example, to stop ost0 on mount point /mnt/test, run:
> 
> $ umount /mnt/test
> Gracefully stopping a server with the umount command preserves the state of the
> connected clients. The next time the server is started, it waits for
> clients to reconnect,
> and then goes through the recovery procedure.
> 
> If the force (-f) flag is used, then the server evicts all clients and
> stops WITHOUT
> recovery. Upon restart, the server does not wait for recovery. Any currently
> connected clients receive I/O errors until they reconnect.
> 
> 4.5.1 Unmounting a Server (without Failover)
> To stop a server (MDS or OSS) without failover, run:
> umount <mds|oss mountpoint>
> 
> This stops the server unconditionally, and cleans up client
> connections and export
> information. When the server restarts, the clients create a new
> connection to it.
> 
> 4.5.2 Unmounting a Server (with Failover)
> To stop a server (MDS or OSS) with failover, run:
> umount -f <MDS|OSS mount point>
> 
> This stops the server and preserves client export information. When the server
> restarts, the clients reconnect and resume in-progress transactions.
> 
> 
> -- 
> --
> Wojciech Turek
> 
> Assistant System Manager
> 
> High Performance Computing Service
> University of Cambridge
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Cheers, Andreas
--
Andreas Dilger
Lustre Technical Lead
Oracle Corporation Canada Inc.