[linux-lvm] Best way to run LVM over multiple SW RAIDs?
Stuart D. Gathman
stuart at gathman.org
Sat Dec 7 20:34:53 UTC 2019
On Tue, Oct 29, 2019 at 12:14 PM Daniel Janzon <daniel.janzon at edgeware.tv> wrote:
> I have a server with very high load using four NVMe SSDs and
> therefore no HW RAID. Instead I used SW RAID with the mdadm tool.
> Using one RAID5 volume does not work well since the driver can only
> utilize one CPU core which spikes at 100% and harms performance.
> Therefore I created 8 partitions on each disk, and 8 RAID5s across
> the four disks.
> Now I want to bring them together with LVM. If I do not use a striped
> volume I get high performance (in expected magnitude according to disk
> specs). But when I use a striped volume, performance drops to a
> magnitude below. The reason I am looking for a striped setup is to
The mdadm layer already does the striping. So doing it again in the LVM
layer completely screws it up. You want plain JBOD (Just a Bunch
Stuart D. Gathman <stuart at gathman.org>
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
More information about the linux-lvm