April 2021
Intermediate to advanced
384 pages
12h 22m
English
Content preview from Modern Data Protection
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 5. Using Disk and Deduplication for Data Protection
In this section of the book, I’ve covered some important conceptual terms and practices, starting with the very important concept of the difference between backup and archive and what makes something a backup (versus a copy). Then I dug a bit deeper into backup, looking at metrics (especially RTO, RPO, RTA, and RPA) along with backup levels and how things are included (or excluded) from backups. Now I want to look at how the typical data path of backup has changed over the past 20 years, as well as how these changes have affected the choices we have when it comes to recovery.
Disk has evolved from hardly being used in backups at all to becoming the primary target for most backups today. (It is also used with archives, but less so, because the economics are different.) There are two primary reasons for the increased use of disk; the first was when vendors started creating disk arrays, using AT attachment (ATA) and serial AT attachment (serial ATA, SATA) disk drives. Prior to this, you really only saw those disk drives in consumer computers and not in the datacenter. Using SATA disk drives made disk significantly less expensive than it used to be.
However, the technology that really made disk feasible was deduplication. It reduces the cost of disk by at least an order of magnitude, and it makes a number of other technologies possible as well. Let’s take a look at this extremely important technology.
Deduplication
Deduplication ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.