DR vs BC and Backup vs Replication

hello my name is Brian van der grift and I'm here today to talk to you a little bit about some of the concepts involved in developing a data protection strategy for your organization some of the main concepts are going to talk about is dr vs bc and that's disaster recovery versus business continuity and then some of the components of those types of plans are doing data backup versus doing replication or doing both so let's talk a little bit about those so to define disaster recovery okay what disaster recovery is you have a disaster okay then you recover so the disaster comes first then you do all the work to recover the systems or the data that might have become unavailable all right business continuity is a little different okay you're doing business that some sort of a disaster happens and then you continue doing business through the disaster so there are little different concepts so now let's talk a little bit about backup versus replication and how they apply to those two concepts for data protection so backup I like to call it more more specifically point in time backup okay so what that is is that you take at a point in time at some scheduled point in time you make a copy of your data and that's the typical way that people approach backing up their data where you know let's say 8:00 p.m. at night everybody's going home to have dinner people are getting out of their systems not a lot of email flow them back and forth at that point in time a copy of the data will be made so let's say that's 8:00 p.m. right so on a typical week you're taking a backup at 8 p.m. 8 p.m. 8 p.m. whatever the case may be ok so let's say that on Wednesday you catch a virus and on Friday that virus results in corruption of the data well to get back to where you have access to your data again your disaster recovery plan for that will be for you to go to recover data from Wednesday before the virus was caught ok so that's a point in time backup strategy okay to compare that let's talk about replication and I'm just going to abbreviate here replication what happens in replication you got server one in one location and then let's say on the other end of an internet connection you have another location with server number two well as data is changed here real time that is replicated or copied over to server two alright so in the same scenario if we caught a virus Wednesday night after we backed up and it results in corruption over here on Friday well guess what it's corrupted in both places because the good data was replicated until it was not good anymore and then once the data became corrupted it was corrupted at the other end okay so you can see that sometimes replication by itself even though it's real time is not necessarily a good thing right so although replication can help you have business continuance through a disaster in a certain scenario it might not be good same thing with deletions let's say you have the Delete key on data well guess what happens over here that same date is deleted right that happened on Friday you come in Monday wow I need that data back if you're not also doing a point-in-time copy so that you can jump back to Friday's backup you can't get that data back but let's just say there's a failure the data spine no corruption all the data that's supposed to be there is there no deletions accidental deletions happened but let's say there's a lightning strike these servers went offline well now you can turn this on and again have business continuance users just now real-time a failover rather than recover back to that to that server so the big impact it's all about money it's all about the Benjamins so you have to think about the impact your business of having one or the other or both to do that we typically look at a graph that on one axis has uptime at one end and then as the graph goes on you have a little bit more knockdown time but a little bit more downtime than being 100% up all right so let's say down here although it's not bad it's it's worse than a hundred percent let's call that 99% down time at the other end well then let's talk about money on this axis okay the paradigm typically looks about like that and this will get very close to the 100% uptime but yet there's kind of very few scenarios you can have you know zero downtime none ever no matter what happens we're never gonna have any downtime even in a failover very hard to accomplish but down here let's say you're only doing backup okay and if you have a failure it's going to take 12 to 24 hours to get the data back up that might result in about a 99 percent uptime solution okay let's say that's in one order of magnitude of cost as you move towards a true business continuity solution another term used is H a or high availability solution the number over here can be in the magnitude of two and a half to three times the cost of doing that why is that well think about this scenario when you go by a server you can't just buy one server you have to buy two servers so it's at least two times the cost right but that's not the end of the story to accomplish replication you'll need replication software many different flavors of replication software that can accomplish this out there on the market but you're also going to need the connectivity between the two either some sort of VPN connection over the Internet where I need lots of internet at both places the internet signature or the bandwidth signature of replication can be high if you have a lot of data and there's a high amount of change to that data in the course of a day or you might need something more secure than that like a private connection between two geographical two geographically diverse locations so if this is across the country yeah that's going to be a couple of magnitudes of dollars if it's just across town well it may just be a single order of magnitude on the cost of that connectivity between the two between the two servers where replication is happening so I hope that did a good job of kind of defining these terms replication disaster recovery backup and business continuity but again the impact is all about how much your organization wants to spend and what kind of solution you want in place for most companies backup is the choice we're going to make sure we backup because we can accomplish disaster recovery with backup but we also protect ourselves against important and accidental deletion typically a replication strategy on his own is not a good way to do it unless you have some ability to fall back in time because of corruption and accidental deletion replication does not have anything to address those two scenarios so keep that in mind when developing this type of a solution

Channel: EATEL Business

Views: 34,322

Keywords: Backup, Replication, DRBC, BCDR, Disaster, Recovery, Planning, Business, Continuity

Id: dM68MKz5AoI

Length: 7min 21sec (441 seconds)

Published: Mon Aug 09 2010