Any suggestions on T2000 disk detection?

We bought 2 used T2000 with 2 72GB disks in each. Initially the one we tested seemed to run OK.
Then we had a requirement to use the system with 4 disks.
Initially the system was running Solaris 10 fine with ZFS mirrored disks in slots 0 and 1.
Adding 2 disks from the second server, they were inserted at slots 2 and 3.
During the install the only disks shown for ZFS mirror file system were slots 0 and 2.
After the install the disks in slots 1 and 3 were still not showing from the OS,
nor from the OK prompt.
However, showenvironment at the sc level did show all 4 disks.
We have played around extensively with 5 disks, running probe-scsi
at the OK prompt. There is no pattern leading to the conclusion that certain
disks are bad, or certain slots are bad. It is random what we get, but at most
2 disks can be seen by the system, while at the SC level, it is seeing all disks.
We get a green light on the disk, showenvironment says it is inserted,
but OBP's probe-scsi and the OS's format command do not see the additional
disks.
The same problem is seen on the other used system, however we don't know how
robust that server is as we've not run an OS on it yet.
We did flash the firmware on the known used T2000 in case it was a problem in OBP,
but nothing has improved. showfaults comes back clean. Post comes up with no errors.
Has this kind of thing been seen before by anyone? We are puzzled by it and forced to
think we have 2 bad T2000 servers, although there was no hint of this before in the one
unit we had run with mirrored disks in slots 0 and 1 for a few months.

The solution is found. The disks from the previous owner were part of a raid set with a controller which was removed from the box.
It was discussed on serverfault.com Deleting the legacy raid set info with raidctl allowed the disks to be recognized again.
I am really surprised this factored into what disks were visible from Open Boot Prompt. I could see Solaris reporting falsely about this, but the ok> prompt ? Surprising ok> prompt level is swayed by raidctl set info somewhere on the disk.
http://serverfault.com/questions/517192/disk-not-shown-in-solaris-11-1-format-tool

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Any suggestions on T2000 disk detection?

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