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.ku...@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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