Peter C. Lai wrote:
On 2010-02-09 06:37:47AM -0500, Dan Langille wrote:
Charles Sprickman wrote:
On Mon, 8 Feb 2010, Dan Langille wrote:
Also, it seems like
people who use zfs (or gmirror + gstripe) generally end up buying pricey
hardware raid cards for compatibility reasons. There seem to be no decent
add-on SATA cards that play nice with FreeBSD other than that weird
supermicro card that has to be physically hacked about to fit.
Mostly only because certain cards have issues w/shoddy JBOD implementation.
Some cards (most notably ones like Adaptec 2610A which was rebranded by
Dell as the "CERC SATA 1.5/6ch" back in the day) won't let you run the
drives in passthrough mode and seem to all want to stick their grubby
little RAID paws into your JBOD setup (i.e. the only way to have minimal
participation from the "hardware" RAID is to set each disk as its own
RAID-0/volume in the controller BIOS) which then cascades into issues with
SMART, AHCI, "triple caching"/write reordering, etc on the FreeBSD side (the
controller's own craptastic cache, ZFS vdev cache, vmm/app cache, oh my!).
So *some* people go with something tried-and-true (basically bordering on
server-level cards that let you ditch any BIOS type of RAID config and
present the raw disk devices to the kernel)
As someone else has mentioned, recent SiL stuff works well. I have
multiple http://www.newegg.com/Product/Product.aspx?Item=N82E16816132008
cards servicing RAID-Z2 and GEOM_RAID3 arrays on 8.0-RELEASE and
8.0-STABLE machines using both the old ata(4) driver and ATA_CAM. Don't
let the RAID label scare you--that stuff is off by default and the
controller just presents the disks to the operating system. Hot swap
works. I haven't had the time to try the siis(4) driver for them, which
would result in better performance.
-Boris
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