Hello,
We want to set up a distributed redundant filesystem using lsm. We want 2
or more alphastations to have a consistent shared mirrored filesystem on
local drives. In this way, each alphastation would be able to have access
to an entire copy of the filesystem each other has and in addition it
would be a private copy. In other words, this is called mirroring but we
want to do it not between drives on the same scsi bus or within one
computer but between multiple computers.
How could we do this? Would it be simply enough to have each disk set
exported and mounted by every other computer and then have lsm running on
each computer mirroring the local drive set and each nfs mounted drive
set? What would be the latency created for writes? What kind of
speed-ups would we get for writes? What would happen if one of the servers
died and nfs was no longer available for that computer? How smooth a
"rollover" in event of one of the computers crashing would this cause?
Our application is a www service which would be created with these
several alphastations load bearing the www service requests and then if
one failed, the remaining computers would take up its place.
Also, because of nfs and the network, what physical network transport
would be a good candidate? Switched fddi (thats expensive)? would
switched ethernet be enough for three alphastations? switched fast
ethernet (those hubs are expensive too!)?
- Brad Block
Received on Sat May 04 1996 - 13:17:40 NZST