[PVE-User] High I/O waits, not sure if it's a ceph issue.

Lindsay Mathieson lindsay.mathieson at gmail.com
Thu Jul 2 01:06:54 CEST 2020

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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