[SQU] Squid Planning and Designning

Hi All

We are an ISP and upgrading Infrastructure I've implemented
wccp sucessfully on two squid boxes we brought NAS,and
GB's of Harddisk space is now available for us

I'm planning to have all the scalable applications like e-mail
web hosting databases etc mounted on the storage
since I have harddisk space available and is scalable to terabytes
I want to mount the /var/spool/squid dir on the storage around
80 GB I'll be having 4 Intel ISP 2150 servers in the frontend
with wccp enabled so the load distribution is taken care by the Cisco
routers

My Question is

1) Can I use the same /var/spool/squid directory for all the 4 servers
                            or
2) Configure each of the servers as proxy-only cache and have
   something like /var/spool/squid1 20 GB
                  /var/spool/squid2 20 GB
                        /var/spool/squid3 20 GB
                        /var/spool/squid4 20 GB
which one is the best solution performance and reliability wise
Or if any other solution please let me know

U r ideas and suggestions are welcome

Thanking you in advance
Suresh

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