Hello,
We are wondering the best way (effective, cost and performance) to have
redundant servers for the task of www serving. Specifically, here are
the needs:
1. Provide hot (on-line) mirror of filesystem and server
2. Ability to take down one (out of two or more) of the redundant
servers for upgrades, fs backup, etc.
3. Possible for not only hot redundancy but also load bearing across (I
understand that servers like lycos use customized dns daemons or
server side redirection when load averages creep up too high)
Here are our considerations so far:
1. We would like to use same machines for each redundant server to allow:
- use same copy of os files to serve all machines
- only "unique" item on machine might be /var and /tmp for
logging and tmp/swap space
2. Consider either having multiple dedicated file servers and seperate
multiple dedicated www servers or having multiple
fileserver/webserver combinations (i.e., in the former case, drives
for the www server would be nfs mounted and filesystems would mirror
each other over the network; in the latter case, drives would be
local to each webserver and mirroring would still be done over the
network)
3. Is it possible to mirror drives over the network?
4. We may consider using a different network physical transport other
than ethernet or at the very least have multiple ethernets
Any pointers to the ways in which lycos handles this problem?
- Thank you!
Brad Block
Received on Tue Apr 30 1996 - 20:00:49 NZST