Please help - adaptec 2820sa not ... RESOLVED
Eric Anderson
anderson at centtech.com
Wed Jun 21 03:20:32 UTC 2006
Scott Long wrote:
> Eric Anderson wrote:
>> Ensel Sharon wrote:
>>
>>>
>>> On Mon, 19 Jun 2006, Jahilliya wrote:
>>>
>>>>> Ok, aac is in the dmesg.
>>>>>
>>>>> I can see both 2820sa cards in the dmesg, and I see no errors, etc. -
>>>>> there are just no drives listed in dmesg.
>>>>>
>>>>> My setup is 8 500 Gb drives in a single raid-6 array, size ~2.8TB.
>>>>> Any
>>>>> problems with that ? Perhaps sysinstall cannot deal with a >2TB drive
>>>>> ? There are no other drives in the system besides the single 2.8TB
>>>>> raid 6
>>>>> array ...
>>>>>
>>>> Have you got any other drives you can attach to the raid?
>>>>
>>>> If so, disconnect the 8 drives connected, connect up a couple that are
>>>> not part of the raid and configure them as a simple raid 1 and see if
>>>> the installers sees that raid. Or try any combination in drives to
>>>> bring the raid size down below 2TB (I'm sure this limitation has been
>>>> fixed.)
>>>
>>>
>>>
>>> Ok, the answer is that it has not been fixed.
>>>
>>> 6.1 sysinstall does in fact see both 2820sa controllers, and when I
>>> put in
>>> a single 160GB sata drive, it does see that single drive and I can
>>> install
>>> onto it, etc.
>>>
>>> Sysinstall does _not_ see my 2.7TB raid6 array. I suspect that if it
>>> were
>>> smaller than 2TB, it would see it correctly.
>>>
>>> I have a number of options with which to deal with this, all of which
>>> involve either wasting money or wasting disk space. Fantastic.
>>
>>
>> Right - FreeBSD doesn't recognize >2TB LUNs.
>
> Wrong on several counts. First, the AAC driver does not present arrays
> to the system as SCSI LUNs. The traditional 2TB limit with 12 byte CDB
> issue simply doesn't exist with this driver. Second, the FreeBSD SCSI
> layer knows how to issue 16 byte CDBs to access >2TB, assuming that the
> target understands the 16-byte protocol. So no, there is no 2TB limit
> inherent to FreeBSD. The only limit is with individual drivers and with
> hardware.
>
> Scott
Scott, thanks for correcting me on this. I was under the (false)
impression that this was a FreeBSD SCSI issue, not a driver issue. I
had tried this with QLogic fiber (fabric) storage in the past, and had
issues, so I incorrectly thought that the information I had was true.
Is it difficult to make drivers (such as the qlogic isp driver) handle
>2TB devices?
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
Anything that works is better than anything that doesn't.
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