Re: Disk failures

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2016-06-09 10:28 GMT+02:00 Christian Balzer <chibi@xxxxxxx>:
> Define "small" cluster.

Max 14 OSD nodes with 12 disks each, replica 3.

> Your smallest failure domain both in Ceph (CRUSH rules) and for
> calculating how much over-provisioning you need should always be the
> node/host.
> This is the default CRUSH rule for a reason.

So, the default failure domain is enough

> Of course if you have 2 switches per rack, dual links and dual power
> supplies feed by independent PDUs on all your gear, a "rack" failure
> domain becomes pretty cosmetic and superfluous.

All of our servers and rack are dual PDUs (with different power feeds)
and dual switches.
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