Re: CEPH 16.2.x: disappointing I/O performance

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Actually recent versions of virtio-blk support discard as well. In general,
I found that virtio-scsi isn't worth it. I appreciate your input though,
thanks!

/Z

On Wed, 6 Oct 2021, 09:03 Janne Johansson, <icepic.dz@xxxxxxxxx> wrote:

> Den ons 6 okt. 2021 kl 06:37 skrev Zakhar Kirpichenko <zakhar@xxxxxxxxx>:
> > Got it. I don't have any specific throttling set up for RBD-backed
> storage.
> > I also previously tested several different backends and found that virtio
> > consistently produced better performance than virtio-scsi in different
> > scenarios, thus my VMs run virtio.
>
> Then again, I think virtio-scsi is required for guests to be allowed
> to run trim/discard, so if thin provisioning and getting space back is
> important, virtio-scsi might be the better end result. Just a thought.
>
> --
> May the most significant bit of your life be positive.
>
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