Il 09 ago 2016 19:20, "Ashish Pandey" <aspandey@xxxxxxxxxx> ha scritto:
> 3 - EC with redundancy 2 that is 4+2
> The over all storage space you get is 4TB and any 2 bricks can be down at any point of time. So it is as good as replica 3 but providing more space.
Not really.
With replica 3 i can set the brick location on different servers so that i can loose multiple servers and not only multiple bricks
What about EC? Are redundant data spread across multiple servers? If not, multiple replica would be placed on the same server. I can loose 2 bricks (2 disks) but what if I'll loose the whole server with both bricks on it? And when a server fails, multiple bricks are affected .........
replica 3 is like a raid10 with 3 disks in each mirror (3 failed bricks in the same replica set=data loss). EC is like raid6 (3 failed bricks in the whole cluster=data loss). The first is safer than the latter but has a huge waste of space.
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