Re: Remote Shadow...

Tom Linden wrote:
On Thu, 31 May 2007 11:59:20 -0700, Richard B. Gilbert <rgilbert88@xxxxxxxxxxx> wrote:

Hal Kuff wrote:

Hi,
Thanks for a spirited discussion all!
We actually have severl EVA8000 arrays and one XP10000 arrays at this facility and Richard is correct in that we do treat our data well.
The problem we are poking at is a site in Baltimore Maryland and a site in Reno Nevada... circuit is a DS-3 or an OC-3 ... the latency is 50ms so you can not use any conventional system to shadow or mirror.... The latency presents requires you do some sort of asynch mirroring.... Now, there are some products out there like Falconstor but at this time it is not clear to us (see other posts) whether it is practical to use with OpenVMS.. The IPSTOR product looks good if we can get our demo system to work with VMS ....
We have flirted with the remote shadow product in the past but never got to the demo stage (actually our fault not theirs in that regard) .. One would think as long as they have been around and porting to Itanium, and having what they say are hundreds of sites in use (according to their web page) that the code would be good... however, Brian's honest assessment appreciated it appears no one has yet spoken for the product...

<snip>

Hal,

ISTR that you have two buildings, a mile or two apart. Have you considered shadowing to disks in the other building? I realize that this will not save you if something knocks out the entire town/city but presumably the sites would be on different substations at least and a fire or flood at one would not necessarily affect the other.


If it is line-of-sight, microwave link would work.


I don't know about the line-of-sight. The last time I used microwave (other than the oven) was fourteen years ago at Princeton University. We had a microwave link bridging about three miles from the Forrestal Campus to the Computing Center on the main campus. It was expensive as hell but cheaper than T1 service which would have had to run through the Telco Point of Presence about twelve miles away. Anybody remember the "MetroWave Bridge"? Ours wasn't done using the DEC hardware but the same idea. ISTR it ran rather slowly during icky weather; heavy rain or snow could slow it down quite a bit!




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