[Lustre-discuss] Lustre failover of MGS

[Brian J. Murrell]

On Tue, 2008-11-25 at 20:45 +0000, neil rutter wrote:
> hi there,

Hi,

> 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.

So you in fact have 4 nodes as your Lustre servers, yes?  What is your
shared storage technology?  How are the two OSSes accessing the same two
OSTs and how are the two MDSes accessing the single MDT and MGT?

> 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<---

Is /dev/sdb actually accessible on the alternative node?  What does
"cat /proc/partitions" say on that node?

What does dmesg tell you after you try to mount /dev/sdb and it fails?

b.

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