raid levels (Information needed)

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I would say the levels of redundancy could roughly be translated like 
this.

  RAID0          one replica (size=1)
  RAID1          two replicas (size=2)
  RAID10         two replicas (size=2)
  RAID5          erasure coding (erasure-code-m=1)
  RAID6          erasure coding (erasure-code-m=2)
  RAIDZ3         erasure coding (erasure-code-m=3)

Read more here:

http://ceph.com/docs/master/rados/operations/pools/

A seven disk RAID6 (4 data, 2 parity and 1 hot spare) would then be 
similar to a Ceph erasure coded pool on seven OSDs with erasure-code-k=4 
and erasure-code-m=2.

Kind regards,
Jerker Nyberg.


On Fri, 16 May 2014, yalla.gnan.kumar at accenture.com wrote:

> Hi All,
>
> What are the kinds of raid levels of  storage provided by Ceph block devices ?
>
> Thanks
> Kumar
>
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