January 2019
Intermediate to advanced
606 pages
15h 1m
English
book
Ceph: Designing and Implementing Scalable Storage Systems
by Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk
Content preview from Ceph: Designing and Implementing Scalable Storage Systems
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OSD variance and fillage
The variance in OSD utilization is crucial in determining whether one or more OSDs need to be reweighted to even out the workload. A reasonably uniform distribution of PGs, and thus of data, among OSDs is also important so that outliers allocated significantly more than their share do not become full. In this section, we'll explore this phenomenon and how to watch for it. In Chapter 19, Operations and Maintenance, we described a strategy for mitigating uneven distribution; here we explore why it happens and how to adjust thresholds to meet your local needs.
The variance for some OSDs can increase when objects are not allocated in a balanced manner across all PGs. The CRUSH algorithm is designed to treat every PG as ...
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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.