Squid parent Selection Algorithm

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Squid parent Selection Algorithm

Hello guys,
I have one question regarding choosing proper peer Selection Algorithm. Actually we have six Squid (2.7) servers with two parent upstream proxies running on two web appliances. In appliance statistics we see that balancing is not optimal and first appliance is keeping the majority of load.

Currently configuration on all Squids looks like:
Code:
cache_peer parent1 parent 80 0 no-query no-digest no-netdb-exchange userhash sourcehash round-robin
cache_peer parent2 parent 80 0 no-query no-digest no-netdb-exchange userhash sourcehash round-robin

My question is how exactly Squid is acting when there is defined more algorithms of Peer Selection (in this case userhash sourcehash round-robin) and how it will behave in case that there are define only two upstream proxies?
Just note that before all six proxies is network balancer which is masking source IP of client so sourcehash seems to be for me as nonsense since source IP is the same every time. User name is visible for proxies so userhash is feasible solution but not sure how much is optimal in case just two parent proxies.

Many thanks for sharing your opinions.
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squid_unix_group(8)					      System Manager's Manual					       squid_unix_group(8)

NAME
squid_unix_group - Squid UNIX Group external_acl helper SYNOPSIS
squid_unix_group [-g groupname] [-g groupname...] [-p] [-s] DESCRIPTION
This helper allows Squid to base access controls on users memberships in UNIX groups. -g groupname Specifies a group name to match. -p Also match the users primary group from /etc/passwd -s Strip NT domain name component from user names (/ or separated) EXAMPLES
This squid.conf example defines two Squid acls. usergroup1 matches users in group1, and usergroup2 matches users in group2 or group3 external_acl_type unix_group %LOGIN /usr/local/squid/libexec/squid_unix_group -p acl usergroup1 external unix_group group1 acl usergroup2 external unix_group group2 group3 NOTES
By default up to 11 groups can be matched in one acl (including commandline specified groups). This limit is defined by MAX_GROUPS in the source code. AUTHOR
This manual page was written by Henrik Nordstrom <hno@squid-cache.org> squid_unix_group is written by Rodrigo Campos <rodrigo@geekbunker.org> KNOWN ISSUES
Does not understand gid aliased groups sometimes used to work around groups size limitations. If you are using gid aliased groups then you must specify each alias by name. QUESTIONS
Any questions on usage can be sent to Squid Users <squid-users@squid-cache.org> REPORTING BUGS
Report bugs or bug-fixes to Rodrigo Campos <rodrigo@geekbunker.org> or Squid Developers <squid-dev@squid-cache.org> SEE ALSO
group(5),passwd(5) Squid UNIX Group helper 12 August 2002 squid_unix_group(8)

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