Dmitri the recommendation from redhat is likely because it is recommended to have the data stripes be a power of two otherwise there is a performance penalty.
On 31 July 2017 at 14:28, Dmitri Chebotarov <4dimach@xxxxxxxxx> wrote:
HiI'm looking for an advise to configure a dispersed volume.I have 12 servers and would like to use 10:2 ratio.Yet RH recommends 8:3 or 8:4 in this case:https://access.redhat.com/documentation/en-US/Red_Hat_ Storage/3.1/html/ Administration_Guide/chap- Recommended-Configuration_ Dispersed.html My goal is to create 2PT volume, and going with 10:2 vs 8:3/4 saves a few bricks. With 10:2 I'll use 312 8TB bricks and with 8:3 it's 396 8TB bricks (36 8:3 slices to evenly distribute between all servers/bricks)As I see it 8:3/4 vs 10:2 gives more data redundancy (3 servers vs 2 servers can be offline), but is critical with 12 nodes? Nodes are new and under warranty, it's unlikely I will lose 3 servers at the same time (10:2 goes offline). Or should I follow RH recommended configuration and use 8:3/4?Thank you.
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