On Tue, Oct 29, 2019 at 12:14 PM Daniel Janzon <daniel.jan...@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
Of Disks).
--
Stuart D. Gathman <stu...@gathman.org>
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
