[Lustre-discuss] MGS failover

[Brock Palen]

The manual does not make much sense when it comes to MGS failover.

Manual:

Note – The MGS does not use the --failnode option.  You need to set the
command on all other nodes of the filesystem (servers and clients),  
about the
failover options for the MGS. Use the --mgsnode parameter on servers  
and mount
address for clients. The servers need to contact the MGS for  
configuration
information; they cannot query the MGS about the failover partner.

This does not make any sense at all, other than you can't use -- 
failnode and that clients can't check with two different hosts for  
MGS data.  Our MGS will be on its own LUN setup with heartbeat  
between two nodes that are also working as an MDS pair. While  
Heartbeat takes care of mounting the MGS file system, how can we tell  
clients "if mds1 is down use mds2 for MGS data"

Thanks.  I hope that makes sense.


Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
brockp at umich.edu
(734)936-1985