Hi Nathan,
I have read the FAQ. However, I still have two
questions:
1) in the case ofan extent lock that spans multiple OSTs,
does theclient talk to all of the OSTs in the extent and
acquire each of their locks?
2) The Lustre data sheet says that in the case of nodes
sharing files each get the largest locks that will allow
all of them to continue to write at their max speed. This
suggests a higher-level locking mechanism that acquires locks
on the clients behalf. Is this true? If not, what am I missing
here?
Many thanks!!
Phil Dickens
On Fri, 20 Jul 2007, Nathaniel Rutman wrote:
Phil Dickens wrote:
Hello,
I would like to make sure that I understand how locking works
in Lustre. The OSTs maintain the locks for all of the objects
they control, so in this respect it is a distributed locking
system. However, to perform the higher-level locking services
(e.g., giving a lock on the entire file to the first requestor)
it would seem to require a centralized lock server, unless all
of the locks from all of the OSTs are acquired.
So my question is whether clients talk to a central lock server
to acquire the locks, and, if so, how are the locking services
divided between a central server and the OSTs?
Hopefully you can see this:
http://clusterfs-intra.com/cfscom/faq-io.html#9
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