[Linux-cluster] Starter Cluster / GFS

Gordan Bobic gordan at bobich.net
Thu Nov 11 09:08:00 UTC 2010

Nicolas Ross wrote:

> Ok, I see. Our applications will read/write into its own directory most 
> of the time. In the rare cases when it'll be possible that 2 nodes 
> read/writes to the same directory, it'll be for php sessions files. If 
> we ever need to reach to this stage, we'll have to make a custom session 
> handler to put them into a central memcached or something else...

You may be better off moving the session files to an asynchronous 
storage medium. Something like master-master replicated MySQL or 
SeznamFS if you want to use the file system. You'll likely save a 
considerable amount of latency on accesses. You don't need 100% 
real-time synchronicity on session information in this way. A few 
milliseconds of lag should be fine and it'll reduce the access latencies 
by potentially quite a lot.


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