SSA - two hosts

[Klorese, Roger B.A.]

On Wednesday, June 11, 1997 2:40 PM, leavitt@webcom.com
[SMTP:leavitt@webcom.com] wrote:
> We've got VM 2.1.2 (or whatever the latest patch revision is), on an
> SSA attached to our S1000E.
> 
> We've got an E4001 with a fiber-optic interface, this machine needs
> local (not NFS) access to the data on this SSA. 
> 
> My idea is, simply export the volume from the S1000E, and import them 
> onto the E4001 (which would be running VM 2.4). It did not occur to
> me that there might be a problem, but now I realize that is kind of
> dumb. 
> 
> Are there any issues here? I floated this before a couple of Sun
> engineers, and didn't get any feedback to that effect.

I'm checking on whether there are any incompatibilities in the on-disk
configuration databases.  I don't believe there are (as there will
likely be between 2.x and 3.x), but it's better to be sure.
 
> Is is sensible to run unmirrored, unstriped Logical Volumes using VxVM, if, 
> underneath, there is a RAID-5 device (the RSM or some other piece of
> equipment). This would be totally convenient, as it would allow me to
> mirror data off to other devices (say, perhaps, Sun's networked FC-AL
devices,
> a year or so down the line)?

Sure.

If the RAID-5 device is an RSM Array 2000, there are a few caveats,
which are available from Sun.  (Basically, the system needs to know
about the array before you try to tell VM -- duh -- and you shouldn't
have RSM-based volumes in rootdg if you're going to use the RDAC
controller-failover driver.)

We have a paper on our web site about combining VM and hardware RAID;
you can find it under "Solutions Showcase", then under "Volume Manager".
 (Try in a few hours -- the paper got kinda lost and that part of the
site is being auto-regenerated now.)