Il 09 ago 2016 10:06 AM, "Ashish Pandey" <[email protected]> ha scritto: > If your main concern is data redundancy, I would suggest you to go for erasure coded volume provided by gluster.
Anyway EC volumes has a lower redundancy level than standard replicated volumes. Let's assume a 9 nodes cluster with 12 disks on each node, redundancy set to 2 You have 9*12 = 108 disks/bricks with redundancy 2 you can loose up to 2 bricks/disks at the same time before loosing data. Using cheap sata disks (gluster is made to run on commodity hardware) loosing 3 disks over 108 in a very short time could happen frequently and this frequency grow as cluster grows With a standard replicated volume, with replica 3, you can loose up to 3 servers (not bricks) because each brick in a replica set must be on a different server. I think EC is something like raid6 (with more "parity") and standard replication is like raid10 but with 3 disks for each mirror. Raid10 is safer as you can loose as many disks as you want, if in different replica set, while raid 6 can loose up to 2 disks in the whole cluster Higher the number of disks, higher the probability of data loss with raid6/EC Am i missed something?
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