Hi
we have a new gluster cluster we are planning on deploying. We will have 24 nodes each with JBOD, 39 8TB drives and 6, 900GB SSDs, and FDR IBNever having attempted anything on this scale I have a couple of questions regarding EC and distibuted disperse volumes.
Does a distributed dispersed volume have to start life as distributed dispersed, or can I take a disperse volume and make it distributed by adding bricks?
Does an EC scheme of 24+4 seem reasonable? One requirement we will have is the need to tolerate two nodes down at once, as the nodes share a chassis.
I assume that distributed disperse volumes can be expanded in a similar fashion to distributed replicate volumes by adding additional disperse brick sets?
I would also like to consider adding a hot-tier using the SSDs, I confess I have not done much reading on tiering, but am hoping I can use a different volume form for the hot tier. Can I use create a disperse, or a distributed replicated? If I am smoking rainbows then I can consider setting up a SSD only distributed disperse volume.
I'd also appreciate any feedback on likely performance issues and tuning tips?
Many Thanks
-Alastair
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