[Sunhelp] "Mirroring" two directories over the net. Info please.

[Robert.Cross at scottish-newcastle.co.uk]

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Jarrett Carver wrote:
>I know that volumn manager and the sparc storage arrays allow you to
>configure two systems to use the same storage array. I have'nt looked into the
>set-up you are talking about, but it may be possible.   (provided you are using
>storrage arrays and the two servers are close enough to connect them both to 
one
>storage array.) This would be more of a network mirroring.

Good thinking!. Yes it is possible with the old SSA100's and 200's, although I 
hear that the two servers would have to be within
60m of each other. The problem with that is that, if I understand it correctly, 
we don't have two Suns involved. If we do then
either have two arrays with Volume Manager mirroring the data on one to the 
other. I would recommend looking at the
A5000's since I'm pretty sure that the older kit doesn't allow simultaneous 
access to the disk. It might be worth having a word
with your friendly Veritas guy/gal?

We're doing it differently here. We have an array with the critical data 
mirrored to disks on another array, (dead easy with VM). When/if
the first host fails (taking it's copy of the data with it), we just force the 
second host to take control of it's copy of the now non-mirrored data.
Remember there's a problem with simultaneous access!

If it is hetrogeneous, then why not look at something that supports multiple 
hosts, something like these network filespace systems.
I believe that IBM do some pretty brilliant ones. This would seem to me to be a 
better solution - mirror the data away from each
machine, but on a system that each has access to?

Bob Cross
[Abject apologies for the lengthy legalese that follows, it's added 
automatically]

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