[Linux-cluster] Using GULM with CLVM

[Patrick Caulfield]

Ugo PARSI wrote:
> Ok thanks for your quick answer :)
> 
>>
>> Yes, it is outdated. clvmd does work with gulm.
>>
> 
> Ok... since this is undocumented.
> 
> Are these steps ok ? :
> 
> -> Start gulm servers.
> -> Update cluster.conf to remove cman and add gulm servers
> -> Remove cman from the node startup scripts
> -> Reboot the whole cluster.
> 
> (I'm not in production yet, so downtime is not a real matter, and I'm
> trying to deal the transition the easiest way)
> 
> Nothing has to be changed for LVM / CLVM ?
> I start / use them the same way ?

That's right. clvmd will detect that it's running with gulm rather than cman.

>>
>> gulm is resource hungry. Get as much RAM as you can ;-)
>> I'm no expert on gulm, but I would expect that 256MB would not be
>> enough for a
>> cluster of over 32 nodes.
>>
> 
> Ouch !
> But gulm is just a central locking server, right ? :)
> I was more thinking of something like 5 or 10 megs max, LOL :)

Well, it depends on how many locks there are obviously. but GFS caches locks
for speed so you can end up with quite a lot!
-- 

patrick