Advise about cache store in SMP mode, single disk

[fernando@xxxxxxxxxxxxx]

Hi there,


I have a server configured to run in SMP mode with two cache stores: a 
shared rock store and a dedicated aufs store for each worker. But I have 
only one physical disk (actually a hardware raid).

My preliminary tests show that having the shared rock store brings 
better response times than having only the aufs stores. But, as I still 
have some disk contention between workers, I wonder if I should replace 
the aufs stores by a diskd one.

Squid docs are not clear about how diskd is supposed to work in a SMP 
setup: will I get only one diskd process, and so eliminate the disk 
contention from aufs stores? Or will squid start a diskd daemon for each 
worker?

I also guess building a CARP setup wound not be so benefical because 
there would be still many workers competing for the same physical disk.


[]s, Fernando Lozano