On Mon, Dec 6 at 23:22, Roy Sigurd Karlsbakk wrote:
Hi all
The numbers I've heard say the number of iops for a raidzn volume
should be about the number of iops for the slowest drive in the
set. While this might sound like a good base point, I tend to
disagree. I've been doing some testing on some raidz2 volumes with
various sizes and similar various amount of VDEVs. It seems, with
iozone, the number of iops are rather high per drive, up to 250 for
these 7k2 drives, even with an 8-drive RAIDz2 VDEV. The testing has
not utilized a high number of theads (yet), but still, it looks like
for most systems, RAIDzN performance should be quite decent.
I think that statement is meant to describe random IO. I doubt anyone
is getting 250 IOPS out of a 7200rpm drive, unless it has been
significantly short-stroked or is using a very deep SCSI queue depth.
Sequential IO should be fast in any configuration with lots of drives.
--
Eric D. Mudama
edmud...@mail.bounceswoosh.org
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