WAN link Disater Recovery

Hello Experts,

I am looking to implement a Disaster Recovery site at our remote office location.  The plan is to do SAN-to-SAN remote replication going both ways.  We however do not have a dedicated WAN link between sites.  I'm new to dealing with Telecommunication Vendors and I've never had to setup a point to point WAN link before so I am hoping to get some help from those who have.

A few questions that I have:

1.  We only have about 1.3 TB of data and we do not have a high transactional environment, how much bandwidth will I need.
2.  What options will I have in regards to a WAN Connection (ie, fiber, T1, DSL, cable, etc...)
3.  What would a ballpark cost be to implement the connection and what are the monthly recurring costs?
4.  What configurations will need to be done on the firewalls at both ends to allow communication?

Any additional advice and or pitfalls would be helpful as well.



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1)  You need to monitor how much data you update when.  It does not matter what the "trasaction" rate it, it is the amount of work that a transaction can do.  We have one system were a single transaction could update 1 million rows of data.  You need to  pick peak update rate.  Doing an average over a 24 hour period does not cut it.  Doing 100MB over 24 hours is a big difference than doing 100MB during a single 5 minute period and then nothing for 23 hours and 55 minutes.

2) You needed to talk to your local telcom's providers.   I doubt if you can do point-to-point cable or dSL, but fiber, T1 are possibility.  In fact multiple T1's or fractional T3/DS3.

3) This depends on where you are located.  Normally this is distance sensitive.  The further apart the locations the higher the cost.

4) That again depends.   Since this will be a private point-to-point link, it does not need to go through your firewalls, so to make things simple I would not attempt to go through the firewalls.
If you go cable modem from somebody like Comcast,standard business speed (22 down about 3 or 4 up ) is about $60 bucks/mo with fixed IP.

What are you backing up?
Windows ?SQL?Exchange?
That will dictate replication software and options.
Do you need just off site data storage or high availability?

Then you might want to look at a visualized environment with something like Vmware and such.
madunixChief Information Officer Commented:
I have implemented 3 sites replication using IBM technology DS8100 SAN storage to host our Oracle DB application, SAN to SAN replication synchronous metro_mirror over Darkfiber distance=5Km with zero lost data between 2 sites (SiteA+SiteB), and asynchronous replication global_mirror over MPLS/IPVPN L3 with 35Mbps distance=150Km (SiteB+SiteC). Look into your area for  a service provider that happens to offer L3 MPLS VPNs. The whole idea about an MPLS Service Provider is that they are "invisible".  So there's nothing special from your perspective that you need.  You MAY be asked to run BGP as a routing protocol, so you'll have to talk to the ISP about that.  

Site A DS8100 is mirrored to Site B DS8100 (Enhanced Remote Mirroring) via Dark fiber with a distance of 5Km, the main idea to lease fiber from a fiber provider.... depending on location,I was happy since SP source was on site near both locations we have to pay them $$ per month for the fiber plus the setup fee. Charges are normally based on mileage and any necessary construction at either/both ends to get the fiber from their existing plant into buildings was completely built by them.

Make sure you check this link:
it will give you a good overview about ibm HA. FYI, in my project i used metro mirror between A-B and global mirror between B-C also i implemented MGM metro global mirror between A-C to get the meta data between the sites.

In redbooks stated that ...
"Metro Mirror is generally considered a campus-level solution, where the systems are located in fairly close proximity, such as within the same city. However, the distance supported will vary based on the write intensity of the application and the network being used. In general, with adequate resources, most customers find up to a 50-kilometer distance acceptable with some customers implementing up to a 300-kilometer distance."
"With Global Mirror, the target site may trail the production site by a few seconds. The frequency of creating a consistency group is a tunable parameter, and you?ll need to balance your recovery point objective with the performance impact of creating a consistency group. Many customers find a three- to five-second consistency group achievable (i.e., in a disaster, you?d lose the last three to five seconds of data)."

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