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Re: [Linux-cluster] A few GFS newbie questions: journals, etc



On Wed, 8 Jun 2005, Lon Hohberger wrote:
Need one journal per node, physical or virtual. So, 20 is your magic number.

Got'cha. Is there any way to expand this at a later date, or I want to set it to the highest possible number right away?


lock_dlm is symmetric, lock_gulm is client/server. Generally, your lock servers should not be accessing the GFS file system, though it is allowed. This gives a lower chance of failures for the lock servers.

<...>

(b) an asymmetric setup with a separate lock server cluster. GFS Clients connecting to the lock server cluster have no "votes" at all, so as long as a majority of the lock server cluster is online, any one of the GFS cluster nodes can come online and access the file system.

I think this sounds like a reasonable way to go - make the physical servers (or a couple of them) the lock servers, and set up the GFS clients as client-only. For this case, will I need to do lock_gulm? If so, I'll have to do some research on how to set that up.


With most lock_dlm setups, nodes have one vote. In that case, you must have...

 floor((n+1)/2)

...nodes online for a quorum to form (except in the 2-node case).

Great - thanks!

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| nate carlson | natecars natecarlson com | http://www.natecarlson.com |
|       depriving some poor village of its idiot since 1981            |
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