November 2017
Intermediate to advanced
494 pages
14h 29m
English
Content preview from Mastering Proxmox - Third Edition
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A cluster map
A cluster map is a map of devices and buckets that compose a Ceph cluster. Ceph uses a bucket hierarchy to define nodes or node locations, such as a room, rack, shelf, host, and so on. For example, let's say there are four disk drives used as four OSDs in the following bucket hierarchy:
Bucket datacenter = dc01 | Bucket room = 101 | Bucket rack = 22 | Bucket host = ceph-node-1 | Bucket osd = osd.1, osd.2, osd.3, osd.4
In the preceding example, we can see that osd.1 to osd.4 are in the node ceph-node-1, which is in rack number 22, which is in room number 101, which is in data center dc01. If osd.3 fails, and there is an on-site technician, then an administrator can quickly give the technician the previous bucket hierarchy to ...
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