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

[velociraptor]

On Thu, Aug 4, 2011 at 9:39 AM, Phil Stracchino <alaric at metrocast.net> wrote:
> On 08/04/11 12:08, N. Miller wrote:
>> On Jul 27, 2011, at 4:11 PM, Shawn Wallbridge wrote:
>>
>>> 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 ;)
>>
>> That's exactly right, Shawn.  Our biggest issues at work with the
x4100/4140's
>> is just this: the LSI & Adaptec RAID don't present real JBOD to ZFS.
>
> I have not had this problem with my LSI 3080X controllers.  They Just Work.
>
The LSI & Adaptec RAID controllers in the 4100/4140 are on the
motherboard.  We've had a lot of trouble with the Adaptec's
particularly.  I may be mis-remembering about LSI JBOD mode, since the
majority of ours have Adaptecs.

=Nadine=