March 2019
Intermediate to advanced
356 pages
10h 7m
English
Content preview from Mastering Ceph - Second Edition
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Thin provisioning
Due to the way RADOS works, RBDs are thin provisioned; that is to say, the underlying objects are only provisioned once data is written to the logical block address that corresponds to that object. There are no safeguards around this; Ceph will quite happily let you provision a 1 PB block device on a 1 TB disk, and, as long as you never place more than 1 TB of data on it, everything will work as expected. If used correctly, thin provisioning can greatly increase the usable capacity of a Ceph cluster as VMs, which are typically one of the main use cases for RBDs, likely have a large amount of whitespace contained within them. However care should be taken to monitor the growth of data on the Ceph cluster; if the underlying ...
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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.
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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.