[Lustre-devel] some observations about metadata writeback cache

Oleg Drokin Oleg.Drokin at Sun.COM
Wed Mar 25 10:48:09 PDT 2009


On Mar 25, 2009, at 12:59 PM, Alex Zhuravlev wrote:
> RR> Simple clients
> RR>     - don't participate in global epochs
> hmm. if committed (in terms of transno) request can be reverted
> during global recovery, then even simple client has to retain
> request on replay list till it's stable in terms of epochs?

Supposedly, server that performed the operation on behalf of the client
can do this? So the simple client semantic does not change - the moment
server has some stable record about hte operation, client can throw the
data away (otherwise simple clients would need to know how to  
in rollback/replay even when the server the operation was sent to did  
go down).


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