From: Greg Ulyatt (greg.ulyatt@red.net)
Date: Thu Nov 13 2003 - 11:15:17 EST
I have a rather annoying problem cropping up and I'm sure there is a
reasonable
answer to this, without spending a ton on Cluster software.
I have several hardware setups where I want to share scsi disks between
2 servers - but never mounted on both at the same time, a sort of simple
failover setup.
In setup 1, I have 2 Netras and 1 Netra st d130 that I want to share
between
them. System 1 would normally mount the disks on the d130 (a simple
website),
but if I need to do maint on the system, I want to be able to unmount on
System 1 and mount on System 2. So far, it kind-of works. I set the
scsi-options
in /etc/system as per infodocs, and the controllers are on different
id's. However, I am not happy about losing ultra-scsi to do this - is
there another way?
Are there any drawbacks that can happen in this scenario that would
cause issues?
In setup 2, I have 2 E5000's and 1 A3500 (NOT FC) with some D1000's on
it. All is working
fine on my main system, but I want to have the ability to do the
following:
1) mount 1 lun on system 2, but if system 2 dies be able to mount on
system 1
2) if system 1 dies, mount all luns on system 2
The docs all say I need cluster software, but do I really? SunCluster is
excessivly expensive and has way more features that I really need - in
fact
the only thing I need is this basic disk sharing.
Or, are there any other software packages I can use from other
suppliers,
or other hardware setups that are viable for a limited budget? FCAL is
still out,
a tad on the high price for the company at the moment :)
Any help or tips would be appreciated, of course I have googled and
searched sunsolve
for info, but everything from Sun says I need Cluster.
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