[Lustre-discuss] Lustre failover of MGS

[Kevin Van Maren]

Sounds like a problem with your mkfs commands.  Please send the full 
"mkfs" commands for the
MGS and MDT luns, and the IP addresses for the primary and secondary 
nodes ("lctl list_nids").

Kevin


neil rutter wrote:
> hi there,
>
> i have an issue with failover of the MGS device within my cluster.
>
> i'm building a simple lustre environment; just one lustre file system 
> (testfs) ...
>
> i have a two node cluster for my MGS/MDT; this is for an active/passive 
> config with the MGS and MDT on different devices and mounted separately 
> (not co-locating).
>
> i have a two node cluster for my OSTs, in an active/active config in 
> that the first OST is on node one and the second OST is on node two.
>
> if i have the above, then heartbeat is happy with the OSTs and the MDT 
> mountpoints being mounted on either node in the cluster. the MGS however 
> is not. i get the following message when it tries to mount on the 
> alternative node:
>
> ---8<---
> mount.lustre: mount /dev/sdb at /lustre/testfs/mgs failed: Invalid argument
> This may have multiple causes.
> Are the mount options correct?
> Check the syslog for more info.
> ---8<---
>
> i've noticed that if i consolidate and have my MGS and MDT on the same 
> device/mountpoint on the MDS cluster nodes, all is well and the file 
> system mounts on the alternative node perfectly.
>
> any ideas?
>
> i have ensured i created the file systems with --failnode and --mgsnode= 
> for each MDS server, but no joy.
>
> i can see in a previous post to lustre-discuss someone having a similar, 
> if not the same issue:
>
> http://lists.lustre.org/pipermail/lustre-discuss/2008-September/008634.html
>
> cheers
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