In the early 1990's we consolidated a data center from Sydney into
Philadelphia. We used SYBACK to do a full dump of specific (most) minidisks
to tape and shipped the tapes. We then performed daily incrementals to
disk, and sent the incrementals via RSCS, via a 9600 baud line at most. I
think we had a 9600 baud line that was shared for RSCS and VTAM traffic, but
the telecom part wasn't mine to worry over. Each minidisk intended to move
was a separate file and sent via SENDFILE. There were service machines
written to send and receive them. I think the first incrementals arrived
before the tapes. In any case, we kept track of different day's
incrementals for a whole week and applied them as they finished arriving.
The line was kept very busy and watched closely, but it was easy to restart
if it dropped.
Our actual cutover the following weekend went fairly quickly and met
whatever target we had, which I certainly think wasn't enough to allow for
backing up, shipping, and applying the tapes.
We repeated the effort consolidating another data center the following year.
That data center, in Toronto, was closer, but larger. The Sydney effort
went well so it was used for Toronto, but I think we had to put in a second
9600 baud line, or bump the line up. (Or maybe it was a higher speed line
to begin with.)
----- Original Message -----
From: "Rich Greenberg" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, October 11, 2006 11:12 AM
Subject: Re: Real core
On: Wed, Oct 11, 2006 at 05:35:50AM -0400,Phil Smith III Wrote:
} Yeah, we had a customer who wanted to move 100TB from Japan to New
Jersey; my recommendation was "Crate the Shark and fly it there". I
calculated that if it took 24 hours door-to-door, that was about
1GB/second throughput. Latency was pretty bad, though...
Back in the dark ages when 9600 was a high speed modem, I was asked
about getting product dumps from (I think) Florida to Callifunny. The
dumps were large enough that it was faster to ship a tape
counter-to-counter than to send that many bytes at 9600.
--
Rich Greenberg N Ft Myers, FL, USA richgr atsign panix.com + 1 239 543
1353
Eastern time. N6LRT I speak for myself & my dogs only. VM'er since
CP-67
Canines:Val, Red, Shasta & Casey (RIP), Red & Zero, Siberians
Owner:Chinook-L
Retired at the beach Asst
Owner:Sibernet-L
