Date: Tue, 10 Dec 2002 04:52:46 -0500 From: "Rouzer, Charles A (Chuck)" <car@vitalit.com> To: <freebsd-cluster@FreeBSD.ORG> Subject: Re: sharing fules within a cluster Message-ID: <00c601c2a031$e527aee0$0301000a@LAPTOP> References: <200212100854.gBA8s6508847@splat.grant.org>
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The configuration you provided is not like the configuration I discussed
with Greg in regards to using Vinum to mirror between machines. He agreed
this should work using Vinum as a software mirror for iSCSI and I assume
local shared SCSI:
HostA harddrive1 is mirrored with harddrive1 on HostB.
HostB does not mount harddrive1 and start HostAs applications until HostA is
determined down hard.
HostB harddrive2 is mirrored with harddrive2 on HostA.
HostA does not mount harddrive2 and start HostBs applications until HostB is
determined down hard.
At the moment I have not investigated mirror syncing and recovery procedures
for this type of fail-over cluster.
> On Tuesday, 12 November 2002 at 13:54:03 +0100, Michael Grant wrote:
> > I'm trying to add some redundency to my box by adding a second box
> > creating a sort of cluster.
> >
> > I would like /home to be available on both boxes and be in sync, i.e.
> > mirrored over a lan or via double-ended scsi. Is it possible to use
> > vinum to do this?
> >
> > +---------+ +---------+
> >>| box 1 | | box 2 |
> >>| disk1a |---scsi-cable---| disk1b |
> >>| disk2a | | disk2b |
> > +---------+ +---------+
> >
> > run vinum on box 1 to create a mirror using disk1a and disk2a. on box
> > 2, same thing, have a mirror between disk1a and disk2a. Then mount r/w
> > the vinum partition on box1 and box2 simultaneously.
> >
> > It seems dangerous to have 2 machines mount the same disk(s) read-write.
> > But maybe this is a solved problem.
>
> Not really. The problem is that each system caches disk data locally,
> and they don't know about each other. There are solutions, but not in
> the space we're talking about here.
>
> > If vinum can't cope with this, do you have any suggestions?
>
> That's what NFS is for.
>
> Greg
>
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