[Lustre-discuss] Dedicated MGS?

[Nathan Rutman]

Klaus Steden wrote:
> Is it possible to update the MGS information on the fly after the file
> system has been created?
>
> I've recently added another network to my Lustre configuration, and I can't
> mount it from this new network (which didn't exist when the file system was
> created).
>
>   
No.  You need to modify modprobe.conf networks, so that the nodes see 
all their new nids,
and then run  tunefs.lustre --writeconf on the MDTs
> thanks,
> Klaus
>
> On 11/21/07 11:55 AM, "Nathan Rutman" <Nathan.Rutman at Sun.COM>did etch on
> stone tablets:
>
>   
>> Jakob Goldbach wrote:
>>     
>>>>> 1. If we are going to have several Lustre file systems, is there any
>>>>> reason not to create each one with its own combined MGS/MDT?
>>>>>       
>>>>>           
>>>> Not that I'm aware of, with the restriction that you can only have a
>>>> single MGS running on a node at a time.  If you have failover MDSes,
>>>> then they need to share an MGS.
>>>>
>>>>     
>>>>         
>>> May a client mount different lustre-filsystems from different MGS's ?
>>>
>>> The manual (sec 2.1.1) says "There should be one MGS per site, not one MGS
>>> per file system."
>>>
>>> I thought this meant a single MGS if a client want's to mount several
>>> lustre-filesystems.
>>>   
>>>       
>> It's not a requirement.  The idea behind a single MGS per site is that
>> way, you can mount
>> multiple different Lustre FS's without having to keep track of which
>> servers they are on
>> -- all you need to remember is the one mgsnid in "mount -t lustre
>> mgsnid:/any_fs"
>> The idea is one centralized place for config data / starting clients /
>> monitoring (eventually).
>>
>> There will be one MGC on the client for each different MGS, so there's
>> slightly more resource
>> usage if you do multiple MGS's, but no big deal.
>>
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>>     
>
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