I don't think anyone has ever compared DLM vs GULM with more than a
handful of nodes. GULM has a history of servicing large clusters, but
is being phased out.
In theory, the two should be comparable performance-wise - especially
when GULM is set up in a redundant fashion. If, however, you will have
nodes constantly joining and leaving the cluster - an unlikely scenario
- that may imply that you should use GULM.
The suggestion to use GULM probably comes from historical knowledge
that GULM performed well in HPC environments, while the DLM was largely
unused in that regard (because it is relatively new).
brassow
On Jan 24, 2006, at 3:00 PM, Eric Anderson wrote:
Wendy Cheng wrote:
Anthony Assi wrote:
Hi,
I would like to know which locking method you guys think is more
preferable to implement on a 36 nodes Cluster (V20Z);
The Distributed Lock Manager (dlm) or the Grand Unified Locking
Manager (gulm) ?
DLM without doubts (since gulm is mostly in maintenance mode)
I recently talked with someone at RedHat (can't recall his name
unfortunately) through a salesperson, and he claimed anything over
about 20 nodes should use GULM instead. Is that not true? How about
the max of 256 nodes?
Eric
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Eric Anderson Sr. Systems Administrator Centaur
Technology
Anything that works is better than anything that doesn't.
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