Warning HD: no root disk controller was found

hi...
i hav a problem to install sco unix
while installing sco unix 5.0.5 in acer altos with hardware raid
am getting error

"Warning HD: no root disk controller was found
system error 5: while getting fs type
flushing controller: DAC960PRL cache done."

i hav use the following commands
boot: defbootstr link=mdac
boot: ahslink
boot: defbootstr ahslink=mdac Sdsk=mdac(0,0,0,1)
boot: defbootstr ahslink=mdac Sdsk=mdac(0,0,1)
but these command are not working.....

plz help me.. i want to solve the problem with in 2days..

Try:
boot: defbootstr link Sdsk=mdac(0,0,0,1)

and put the mdac diskette in the drive.

i hav used tis command also but it's still not working dude........

How many system disks does the POST report, and what condition are they in?

there are three disk they are

" Segate cheetah Model no: ST318406LC ultra3 SCSI 10k 18GB "

three disk are same disk

But what is the RAID configuration, and the state of the RAID (dead, degraded, online)

now "no root disk controller was found" is rectified.
tis error coz of hardware raid not configured properly.

now only error is

"system error 5: while getting fs type
flushing controller: DAC960PRL cache done."

During the setup you are asked questions about how the install is to proceed.
You should choose Fresh for install type as opposed to Upgrade.
You should choose Manual, full control/fdisk/divvy, for how the hard drive is to be set up.
Run the badtrk program and select destructive scan.
Allocate about 5gb for the root file system and the balance for /u

thx dude..

i hav find a soln for it..

soln:-

syntax:
boot: defbootstr ahslink=mdac Sdsk=mdac(0,0,0,1) disable=[scsi chip driver name]

example:
boot: defbootstr ahslink=mdac Sdsk=mdac(0,0,0,1) disable=DAC960

---------- Post updated at 04:54 PM ---------- Previous update was at 04:25 PM ----------

i hav a same problem in another acer altos machine

error:

NOTICE: k_trap - Unexpected NMI in system mode!

boot: defbootstr link=mdac
boot: defbootstr link=alad
boot: ahslink
boot: defbootstr ahslink=mdac Sdsk=mdac(0,0,0,1)
boot: defbootstr ahslink=mdac Sdsk=mdac(0,0,1)
boot: defbootstr ahslink=mdac Sdsk=mdac(0,0,0,1) disable=DAC960
boot: defbootstr ahslink=alad Sdsk=alad(0,0,0,1) disable=DAC960
boot: defbootstr ahslink=alad Sdsk=alad(0,0,0,1)
but these command are not working.....
plz help me..

These machines have a Mylex DAC960 raid adapter in a pci slot. They also have two onboard Adaptec controllers (alad). If you are not using the Adaptec controllers then disable them in the CMOS. If you are using them (for tape or cd) then you can add the scsi.noscan option to the boot string. bootstring(HW)

Warning: SCSI boot option(s) ignored unknown host adapter

I need a exact command dude....
am new to sco unix.. plz.. help me..

FOR UR INFO:

ADAPTEC AIC-7880 scsi bios v2.01
SCSI ID:5 HP C1537A (tape Drive)

DAC960 PCI address:80102000 Bus=0 Dev/slot=15 Function=1 IRQ=10

%adapter 0xB800 - 0xB8FF 11 - TYPE = ALAD HA=0 BUS=0 ID=7 FTS=STO

%adapter 0x9000 - 0x9043 10 - TYPE = MDAC(V4.10) 1-CHNL 16-IDS HA=0

%adapter 0x01F0 - 0x01F7 14 - TYPE = IDE CTRL=PRIMARY DVR=WD

DAC960 V4.06 ADDR=80102000 IRQ=10 CTL=0 CH=1 ID=16 BUS=PCI :0 SLOT=15

defbootstr Sdsk=mdac(0,0,0,1) scsi.noscan wd.noscan

Disabling drivers with bootstrings

i hav use the above command but it's not working..

after loading image from floppy system will automatically restart..

I think you have a hardware problem.

i hav already changed the scsi hard disk, hardware raid card, ram, scsi cd drive.. but it's still not working.........

Consider upgrading.
Either replace the motherboard, cpu, memory and power supply in the original case, or move the RAID controller and disks to a new bare bones system.
SCO 5.0.6 (install all the patches) will run on a P4 system, and will install with a 5.0.5 license.

it's not showing error..

but it's standing on the line

G hd_config

after getting tis line sco unix 5.0.5 is not installing..

there are 2 scsi cards one is AIC-7880
another one is mylex corporation DAC960

if i remove the mylex scsi card also same message is displaying..

means the install program cannot initialize the disk

plz.. tell how can i resolve tis problem...

plz.. very urgent...