Please help - adaptec 2820sa not ... RESOLVED

Eric Anderson anderson at
Mon Jun 19 02:06:39 UTC 2006

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.  You should make two LUNs, 
and concat them or stripe them with GEOM.  Don't use the large partition 
for the OS either.

You shouldn't waste either disk space or money.


Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.

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