[Lustre-discuss] Failover for MGS

[Wojciech Turek]

Hi,

How will look my tunefs.lustre command line if I would like to  
configure failnode for my MDS. I have two MDT's and MGS is on the  
same block device that one of MDT's ? I have also two servers  
connected to share matadata storage.

Thanks,

Wojciech
On 12 Nov 2007, at 20:49, Nathan Rutman wrote:

> Robert LeBlanc wrote:
>> Ok, I feel really stupid. I've done this before without any  
>> problem, but I
>> can't seem to get it to work and I can't find my notes from the  
>> last time I
>> did it. We have separate MGS and MDTs. I can't seem to get our MGS to
>> failover correctly after reformatting it.
>>
>> mkfs.lustre --mkfsoptions="-O dir_index" --reformat --mgs
>> --failnode=192.168.1.253 at o2ib /dev/mapper/ldiskc-part1
>>
>>
> The MGS doesn't actually use the --failnode option (although it won't
> hurt).  You actually have to tell the other nodes
> in the system (servers and clients) about the failover options for the
> MGS (use the --mgsnode parameter on servers, and mount address for
> clients).   The reason is because the servers must contact the MGS for
> the configuration information, and they can't ask the MGS where its
> failover partner is if e.g. the failover partner is the one that's  
> running.
>
>> We are running this on Debian, using the Lustre 1.6.3 debs from  
>> svn on Lenny
>> with 2.6.22.12. I've tried several permutations of the mkfs.lustre  
>> command,
>> specifing both nodes as failover, and both nodes as MGS and pretty  
>> much
>> every other combination of the above. With the above command  
>> tunefs.lustre
>> shows that failnode and mgsnode are the failover node.
>>
>> Thanks,
>> Robert
>>
>> Robert LeBlanc
>> College of Life Sciences Computer Support
>> Brigham Young University
>> leblanc at byu.edu
>> (801)422-1882
>>
>>
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>
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Mr Wojciech Turek
Assistant System Manager
University of Cambridge
High Performance Computing service
email: wjt27 at cam.ac.uk
tel. +441223763517



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