Date: Fri, 12 Sep 1997 21:15:04 -0500 From: Dan Nelson <dnelson@emsphone.com> To: spork <spork@super-g.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Clustering/fail-over capability? Message-ID: <19970912211504.29147@emsphone.com> In-Reply-To: <Pine.BSF.3.96.970912211308.12209A-100000@super-g.inch.com>; from "spork" on Fri Sep 12 21:15:14 GMT 1997 References: <341965AD.7688@PartsNow.com> <Pine.BSF.3.96.970912211308.12209A-100000@super-g.inch.com>
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In the last episode (Sep 12), spork said:
> To stray slightly from this thread, has anyone seen this type of
> setup in the PeeCee world:
>
> SCSI-ADAPTER----DRIVE----DRIVE----SCSI-ADAPTER
>
> I've seen mention that two controllers can exist on the same chain,
> is that true? What type of things could one do with this?
>
> Off to read the SCSI-FAQ,
>
> Charles
It's certainly possible. I did a few years ago, with:
T--HD(0)---Amiga(7)----------PC(6)---HD(1)--T
|<----Machine 1---->| |<----Machine 2---->|
boots from (0) boots from (1)
(Numbers in parens are the SCSI IDs). I recall having to be careful
booting up the Amiga, as it didn't like probing the other host adapter.
And I'm doing it right now at work:
T--HD(0)--HD(1)--PC(7)-------RAID(4)(5)-------PC(6)--HD(3)--T
|<-----Machine 1------>| |<-Raid array->| |<---Machine 2--->|
boots from (0) boots from (3)
Each machine has a 60-gig partition on the RAID array, and NFS mounts
the other over full-duplex 100mbit Ethernet. I'm not doing any
failover (the machines are reliable, and aren't in use after working
hours), but I conveivably could determine that the other server is
down, fsck it's disk, and mount it on the other machine.
-Dan Nelson
dnelson@emsphone.com
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