Re: [PATCH 0/7] dlm: overview

From: Lars Marowsky-Bree
Date: Wed Apr 27 2005 - 08:43:53 EST

On 2005-04-26T11:48:45, Mark Fasheh <mark.fasheh@xxxxxxxxxx> wrote:

> Resource lookup times, times to deliver events to clients (asts, basts,
> etc) for starters. How long does recovery take after a node crash? How does
> all of this scale as you increase the number of nodes in your cluster?

Well, frankly, recovery time of the DLM mostly will depend on the speed
of the membership algorithm and timings used. My gut feeling is that DLM
recovery time is small compared to membership event detection and the
necessary fencing operation.

But yes, scalability, at least roughly O(foo) guesstimates, for numbers
of locks and/or number of nodes would be helpful, both for a) speed, but
also b) number of network messages involved, for recovery and lock

Mark, do you have the data you ask for for OCFS2's DLM?

(BTW, trimming quotes is considered polite on LKML.)

Lars Marowsky-Brée <lmb@xxxxxxx>

High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business

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