[pve-devel] Ceph Octopus is out!

[Alexandre DERUMIER]

I'm pretty excited by the new write-around cache policy for librbd  && io scheduler:)

(better than writeback, no read latency impact :)



librbd now uses a write-around cache policy be default,
replacing the previous write-back cache policy default.
This cache policy allows librbd to immediately complete
write IOs while they are still in-flight to the OSDs.
Subsequent flush requests will ensure all in-flight
write IOs are completed prior to completing. The
librbd cache policy can be controlled via a new
“rbd_cache_policy” configuration option.

librbd now includes a simple IO scheduler which attempts to
batch together multiple IOs against the same backing RBD
data block object. The librbd IO scheduler policy can be
controlled via a new “rbd_io_scheduler” configuration
option.


----- Mail original -----
De: "Thomas Lamprecht" <t.lamprecht at proxmox.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>, "Victor Hooi" <victorhooi at yahoo.com>
Envoyé: Mardi 24 Mars 2020 14:00:30
Objet: Re: [pve-devel] Ceph Octopus is out!

Hi, 

On 3/24/20 1:53 PM, Victor Hooi wrote: 
> Hi, 
> 
> So I just saw the release annoucement for Ceph Ocotpus: 
> 
> https://ceph.io/releases/v15-2-0-octopus-released/ 
> 
> YAY! =) 
> 
> So I'm going to ask the question - when will this be in Proxmox? =) (e.g. 
> in Ceph Testing). 

I'd guess we get some testing stuff out in Q2/2020, depending on how 
well the changes in details play with our integration. 

As I know ceph, waiting on a stable point release, which should also include 
our dev testing feedback, will probably make sense to do. 
After all we want a smooth (upgrade) experience :) 

cheers, 
Thomas 

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