[PVE-User] Poor CEPH performance? or normal?

Alwin Antreich aa at ipnerd.net
Wed Jul 25 08:10:59 CEST 2018


Hi,

On Wed, Jul 25, 2018, 02:20 Mark Adams <mark at openvs.co.uk> wrote:

> Hi All,
>
> I have a proxmox 5.1 + ceph cluster of 3 nodes, each with 12 x WD 10TB GOLD
> drives. Network is 10Gbps on X550-T2, separate network for the ceph
> cluster.
>
Do a rados bench for testing the  cluster performance, spinners are not
fast.


> I have 1 VM currently running on this cluster, which is debian stretch with
> a zpool on it. I'm zfs sending in to it, but only getting around ~15MiB/s
> write speed. does this sound right? it seems very slow to me.
>
Never ever use a CoW filesystem on top of another CoW system. This doubles
the writes that need to be made.


> Not only that, but when this zfs send is running - I can not do any
> parallel sends to any other zfs datasets inside of the same VM. They just
> seem to hang, then eventually say "dataset is busy".
>
Ceph already gives you the possibility of snapshots. You can let PVE do
this through CLI or GUI.

--
Cheers,
Alwin


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