[rescue] FreeBSD and ZFS, was Re: 3ware raid

Zachary Giles zgiles at gmail.com
Wed Jul 27 18:24:22 CDT 2011

You're probably right. I notice it doesnt give any SMART data and all
the disks are named "3ware". It does, however, appear to give the
entire disk to you and not write extra crap to it. For what it's

I just bought 2 of the Supermicro controllers from Newegg. They should
be here in a few days. I'd just feel more comfortable running on real
non-raid hardware with solaris. I'll let y'all know how it goes when
they get here.

On Wed, Jul 27, 2011 at 4:11 PM, Shawn Wallbridge <swallbridge at gmail.com>
> From what I remember about a talk by Bryan Cantrill a while back,
> Solaris ZFS wants direct access to the disk. They do some funky stuff,
> because after testing they realized that you can't trust anything.
> They had controllers, cables, and even disk 'lie' about things, or
> introduce errors. So when they developed the x45(0,4)0's, they went
> with controllers that they could directly access the drives, in some
> low level way.
> But again, this was all a long time ago, so I could have bit rot in my
> grey matter ;)
> shawn
> On Wed, Jul 27, 2011 at 4:03 PM, Mouse <mouse at rodents-montreal.org> wrote:
>>>> The 3ware controllers have JBOD mode that turns all the "hardware"
>>>> raid off.
>>> Except that 3Ware JBOD mode is not *PRECISELY* JBOD.  It's closer to
>>> "a bunch of whole-single-disk logical volumes".
>> What, exactly, is JBOD here?
>> I don't know the hardware that's been under discussion.  But I do work
>> with a machine containing
>> twe0 at pci2 dev 2 function 0: 3ware Escalade
>> twe0: interrupting at ioapic1 pin 4 (irq 10)
>> twe0: 12 ports, Firmware FE7S, BIOS BE7X
>> twe0: Monitor ME7X, PCB Rev5    , Achip 3.20    , Pchip
>> and its JBOD appears to be pretty much exactly what I would think:
>> direct access to the whole drive.  That machine has some pdcsata cards
>> as well, and I've moved disks between pdcsata and twe without needing
>> to touch the data on them and it's all Just Worked.
>> /~\ The ASCII                             Mouse
>> \ / Ribbon Campaign
>>  X  Against HTML                mouse at rodents-montreal.org
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Zach Giles
zgiles at gmail.com

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