March 2019
Intermediate to advanced
356 pages
10h 7m
English
Content preview from Mastering Ceph - Second Edition
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Disks
When choosing the disks to build a Ceph cluster with, there is always the temptation to go with the biggest disks you can, as the total cost of ownership figures looks great on paper. Unfortunately, in reality this is often not a great choice. While disks have dramatically increased in capacity over the last 20 years, their performance hasn't. Firstly, you should ignore any sequential MB/s figures, as you will never see them in enterprise workloads; there is always something making the I/O pattern non-sequential enough that it might as well be completely random. Secondly, remember the following figures:
- 7.2k disks = 70–80 4k IOPS
- 10k disks = 120–150 4k IOPS
- 15k disks = You should be using SSDs
As a general rule, if you are designing ...
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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.