[ceph-users] Ceph pure ssd strange performance.

Darius Kasparavičius daznis at gmail.com
Tue Nov 20 03:47:21 PST 2018


Update.

So I rebuilt the osd with a separate DB partition on the ssd drive and
i/o to disks is what I expected, about ~3x the client I/O.
On Tue, Nov 20, 2018 at 11:30 AM Darius Kasparavičius <daznis at gmail.com> wrote:
>
> Hello,
>
>
> I'm running some tests on pure SSD pool with mimic and bluestore.
> Strange thing is that currently running fio into rbd images I'm
> getting a huge difference client and disk I/O. For pure write
> performance I'm seeing about ~20k iops on the client side and about
> ~300k on the ssd side. I have used lvm and no db/wal partitions.
> Should I try to create the osd with a separate db partition?
>
> I have run a hdd ceph cluster with bluestore and nvme db partitions
> and there aren't such differences in io.
>
> Regards,
>
> Darius


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