Re: Hi-AV cluster disk ownership?

[David Brower <david.brower@oracle.com>]

Many systems will discover all visible LUNs on the
SAN and make them visible as raw devices.  If it's Windows,
it'll try to mount all the ones that look like file systems;
on UNIX, mounting is limited by fstab, but not creation of
/dev disk partitions.

To keep nodes from picking up disks they aren't supposed
to see (or mount), you can do things like program the domains
of the SAN or the disks (eg: brocade switch), or rely on
higher level software to negotiate between nodes (eg: MSCS).

Discovery often involves probe operations, which can be very
time consuming on a SAN; some systems cache things they saw
last time in an attempt to reduce boot time, but this gets
complicated when storage is altered in their SAN visibility.

-dB

Rob Latham wrote:
> 
> On Fri, Oct 05, 2001 at 10:34:49AM -0700, Ramachandra Pai wrote:
> 
> > In a cluster with storage disks on SAN, what is the
> > mechanism to identify which disks belong to which
> > cluster?  NOTE: there can be many many nodes on the
> > SAN, all of which may not be clustered with each
> > other.
> 
> i may be missing something, but isn't that called an "fstab" ?
> 
> ==rob
> 
> --
> [ Rob Latham <rlatham@plogic.com>         Developer, Admin, Alchemist ]
> [ Paralogic Inc. - www.plogic.com                                     ]
> [                                                                     ]
> [ EAE8 DE90 85BB 526F 3181                   1FCF 51C4 B6CB 08CC 0897 ]
> 
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