On 30/06/2020 11:09 pm, Mark Schouten wrote:
I think this is incorrect. Using KRBD uses the kernel-driver which is
usually older than the userland-version. Also, upgrading is easier when
not using KRBD.

I'd like to hear that I'm wrong, am I?:)

I did some adhoc testing last night - definitely a difference, in KRBD's favour. Both sequential and random IO was much better with it enabled.

There's some interesting theads online regards librbd vs KRBD. Apparently since 12.x, librd should perform better, but a lot of people aren't seeing it.


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