Have you explored other communication options besides the traditional telco
T1/T3?  In particular, DSL and cable modem internet connections.  If one of
those modes are available to you, you can tunnel over a VPN to your other
site.  That would be cheaper and faster than a T1.
-Ken

-----Original Message-----
From: Kauffman, Tom [mailto:KauffmanT AT NIBCO DOT COM]
Sent: Thursday, January 05, 2006 10:47 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Running tapes off-site multiple times in a day?


A single T1 won't handle the load. We average about 22 GB of redo log per
day, and I've seen peaks over 45 GB. Multiple T1s gets "interesting" in
terms of making them look like a single fat pipe to the application
-- and to handle our peak environment, the T1 count actually gets to a
price-match with a T3.

And the company isn't willing to spring the monthly cost for multiple Ts
(there was some consternation at the cost of a single T1, and a lot of
consternation when I said it wouldn't be enough).

Oh -- and these volumes are for the *single* copy of the redo logs.

Tom

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Larry Peifer
Sent: Thursday, January 05, 2006 8:12 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Running tapes off-site multiple times in a day?

If it's just an Oracle DB issue, no backups, then how about using Oracle
Data Guard at the 'safe' site and transmit the logs via T1 and put a TSM
server and tape solution on the 'safe' site server.  We've been using this
type of option for many years now.





"Kauffman, Tom" <KauffmanT AT NIBCO DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> 01/05/2006 
07:29
AM Please respond to
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


To
ADSM-L AT VM.MARIST DOT EDU
cc

Subject
Re: [ADSM-L] Running tapes off-site multiple times in a day?






No backups, just Oracle redo logs -- but I can generate 20 GB of redo in the
prime shift window on a good day. We currently run the redo logs to TSM
every 15 minutes; two copies, to two separate storage pools, backed up to
two separate backup copypools. We have sites doing production and shipment
updates to SAP 24 X 7, with invoices being generated and faxed multiple
times per day. This is the activity we really don't want to loose.

I have a dedicated p5-550 TSM server, all disk is ESS raid-5, and my tape is
LTO-2 in a fiber-attached 3584.

The 'safe' building is our hangar at the local airport -- 13 miles away
direct line. We've looked at the various fiber extenders, iSCSI, and all the
other options -- and can't make a business case for the cost. The best
option we've come up with was an Intel-based system, running linux, with a
local raid array and DAT tape -- but the monthly charge for the circuit was
a project killer.

Tom

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Richard Sims
Sent: Thursday, January 05, 2006 10:11 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Running tapes off-site multiple times in a day?

On Jan 5, 2006, at 9:54 AM, Kauffman, Tom wrote:

> Our management wants to reduce the possible data loss in the event of
> a disaster by taking copies off-site both in the early morning and
> again at the end of first shift. ...

Tom - That implies that they are thinking of running backups and then
       Backup Stgpool during prime shift - something which isn't usually
done due to impact on production.  Not knowing all the factors, I might
think of using mirroring (perhaps even through FC to a disk array in a
"safe" building) for failure protection during the day, and stick with
conventional overnight backups for corruption, DR, and auditing reasons.

I'd encourage them to step back and look at the big picture, in conjunction
with prevailing technology opportunities.

   Richard Sims