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Re: [Linux-cluster] When using GFS+DLM, will DLM manage the locks on journals?



Ja S wrote:
--- Gordan Bobic <gordan bobich net> wrote:

Ja S wrote:
Hi, All:

Just want to get a clarification.

When using GFS+DLM, will the locks of journals be
managed also by DLM in the same way as that for
normal
data files?
My understanding is that there is no locking on the
journals across nodes except when a node gets fenced and it's journal needs to be replayed to ensure data is consistent. Each node has
it's own journal.

Thanks. Then what this "can't acquire the journal
glock:" error is about?

I think the journals are allocated on a first-come first-served basis to the nodes as they connect to the shared storage. Each node locks it's own journal to ensure that it is marked as "in use". That's why you'll see that message at mount time. But I don't think there is any journal locking going on under normal operation.

Gordan


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