Jeremy Chadwick wrote:
No, it should not happen at idle. You said "interrupt usage across 5
disks", which I read to mean "interrupt usage is very high during I/O
across a zpool consisting of 5 disks". I misunderstood.
IRQ sharing could result in what you see, but it sounds more like some
weird interrupt routing/bug that might be specific to that Asus board.
That's kinda what I fear might be the case.
The FreeBSD Handbook has a list of hardware. Anything that has its own
xxx(4) driver (e.g. twa(4), twe(4), arcmsr(4), etc.) will suffice. Many
of these cards handle SATA disks which appear as daX in FreeBSD, since
they act as SCSI controllers. SCSI CAM on FreeBSD is quite reliable.
Currently, the best SATA controllers I've seen that have native FreeBSD
support (meaning the vendor supports FreeBSD) are Areca controllers. I
have no experience with them due to their cost, but they are *very*
fast.
Ouch.... Are the any other options?
I'd be happy with a card that simply exposed the drive to FreeBSD rather
than implemented Raid. Although I won't rule hardware raid out either
(given a product that was fast enough).
-D
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