Hi. I've been running some similar tests recently, (on ubuntu, but still).
Thomas Mueller wrote:
dbench 1 results:
* 1 disk, btrfs: 115
* 2 disks, btrfs data/metadata raid0: 115
This is suspicious.
I'm also not sure whether you mean that you're running btrfs on an md or
lvm stripe or using multiple device btrfs file systems.
My numbers are showing that btrfs multidevice support may not be very
good right now but I get pretty good results from lvm stripes. The
hardware I'm testing now is the first hardware I've tried, (of prolly a
couple dozen over the years), where the controller can actually keep all
disks spinning. Most cannot.
Try building an lvm stripe on your two disks and testing dd directly to
the stripe.
--rich
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