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 > > ________________________________ > > This message is for the designated recipient only and may contain privileged, proprietary, or otherwise confidential information. If you have received it in error, please notify the sender immediately and delete the original. Any other use of the e-mail by you is prohibited. Where allowed by local law, electronic communications with Accenture and its affiliates, including e-mail and instant messaging (including content), may be scanned by our systems for the purposes of information security and assessment of internal compliance with Accenture policy. > ______________________________________________________________________________________ > > www.accenture.com >
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