This is actually pretty common believe it or not. This does not
provide filesystem redundancy though. What this provides is a
mechanism to have multiple servers to touch the same disks. There
clearly is some danger here since you can't have multiple machines
touching the same filesystem. So what people tend to do is have some
sort of monitoring application check if the other machine is still
up; when it dies it simply takes over the filesystem from the failed
machine.
There is even an opensource product called "Fail Safe" that provides
the monitoring app functionality. Last time I used it, it wasn't
very robust but it did have all the required knobs to make such a
thing work.
/marco
On Nov 16, 2005, at 7:35 AM, knitti wrote:
There are SCSI enclosures with the ability to connect to two different
SCSI buses, so they can be accessed from two different machines.
I _think_ the SCSI architecture could allow more than one host
adapter on a bus. _But_ I never heard someone did this. I presume it
would also depend on the host adapter and the driver.
--knitti
