[Lustre-discuss] Lustre failover of MGS

[neil rutter]

kevin, brian,

thanks to you both. i had a mkfs.lustre error, which after had been 
pointed out fixed the issue.

Brian J. Murrell wrote:
> 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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