I just added a new drive to my file server. A 4Gb Quantum VIKING (SCA
with an adaptor to Ultra+Wide).
  My suspicion is that there is some parameter that needs tuning on
the NCR driver.... I have 6 devices, counting LUNs and adaptor, 8.
The system hangs at the end of the boot sequence with:
ncr0: no ccb.
sd3: not queued, error 5

  I can get into the debugger at this point, but it just was sitting
in idle.

  The boot messages are below. After rebooting twice, checking
the file systems, etc. and then going multiuser, it occurs again.
I removed the new drive from the chain, and now the boot blocks
can't load the kernel from the boot drive. I don't know if this
is a SCSI problem, or file system damage yet... I left my boot disk
at my other office... NetBSD1.3.2 CDROM to the rescue. More later.

NetBSD 1.3F (SSW) #0: Mon Aug  3 06:19:01 EDT 1998
mcr@istari.sandelman.ottawa.on.ca:/corp/network/kernels/compile-current/SSW
cpu0: family 5 model 1 step 4
cpu0: AMD K5 (586-class)
real mem  = 66715648
avail mem = 59875328
using 840 buffers containing 3440640 bytes of memory
mainbus0 (root)
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o enabled, memory enabled
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82437VX System Controller (TVX) (rev. 0x02)
pcib0 at pci0 dev 7 function 0
pcib0: Intel 82371SB PCI-to-ISA Bridge (PIIX3) (rev. 0x01)
Intel 82371SB IDE Interface (PIIX3) (IDE mass storage, interface 0x80) at pci0 dev 7 function 1 not configured
Trident Microsystems TGUI 9660 (VGA display, revision 0xd3) at pci0 dev 17 function 0 not configured
ncr0 at pci0 dev 19 function 0: ncr 53c875 fast20 wide scsi
ncr0: interrupting at irq 12
ncr0: minsync=12, maxsync=137, maxoffs=16, 128 dwords burst, large dma fifo
ncr0: single-ended, open drain IRQ driver, using on-chip SRAM
ncr0: restart (scsi reset).
scsibus0 at ncr0: 16 targets
sd0 at scsibus0 targ 0 lun 0: <CONNER, CFP1060S 1.05GB, 2035> SCSI2 0/direct fixed
sd0(ncr0:0:0): 10.0 MB/s (100 ns, offset 15)
sd0: 1013MB, 2756 cyl, 8 head, 94 sec, 512 bytes/sect x 2074880 sectors
sd1 at scsibus0 targ 1 lun 0: <DEC, RZ28     (C) DEC, 442E> SCSI2 0/direct fixed
sd1(ncr0:1:0): WIDE SCSI (16 bit) enabled
sd1(ncr0:1:0): 20.0 MB/s (100 ns, offset 15)
sd1: 2007MB, 3045 cyl, 16 head, 84 sec, 512 bytes/sect x 4110480 sectors
cd0 at scsibus0 targ 4 lun 0: <TOSHIBA, CD-ROM XM-5401TA, 3605> SCSI2 5/cdrom removable
probe(ncr0:4:1): 4.0 MB/s (250 ns, offset 16)
st0 at scsibus0 targ 6 lun 0: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 1/sequential removable
st0: st0(ncr0:6:0): 5.0 MB/s (200 ns, offset 15)
density code 0x24, 512-byte blocks, write-enabled
ch0 at scsibus0 targ 6 lun 1: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 8/changer removable
ch0: 4 slots, 1 drive, 1 picker, 0 portals
sd2 at scsibus0 targ 8 lun 0: <QUANTUM, VIKING 4.5 SCA, 880R> SCSI2 0/direct fixed
sd2(ncr0:8:0): WIDE SCSI (16 bit) enabled
sd2(ncr0:8:0): 40.0 MB/s (50 ns, offset 16)
sd2: 4345MB, 6144 cyl, 8 head, 181 sec, 512 bytes/sect x 8899737 sectors
sd3 at scsibus0 targ 15 lun 0: <FUJITSU, M2952Q-512, 0147> SCSI2 0/direct fixed
sd3(ncr0:15:0): WIDE SCSI (16 bit) enabled
sd3(ncr0:15:0): 40.0 MB/s (50 ns, offset 15)
sd3: 2291MB, 5714 cyl, 5 head, 164 sec, 512 bytes/sect x 4693462 sectors
de0 at pci0 dev 20 function 0
de0: interrupting at irq 11
de0: SMC 21041 [10Mb/s] pass 2.1
de0: address 00:e0:29:11:0e:72
isa0 at pcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
ast0 at isa0 port 0x1a0-0x1bf irq 9
com3 at ast0 slave 0: ns16550a, working fifo
com4 at ast0 slave 1: ns16550a, working fifo
com5 at ast0 slave 2: ns16550a, working fifo
com6 at ast0 slave 3: ns16550a, working fifo
npx0 at isa0 port 0xf0-0xff: using exception 16
vt0 at isa0 port 0x60-0x6f irq 1
vt0: unknown trident, 80 col, color, 8 scr, mf2-kbd, [R3.32]
vt0: console
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
biomask 1040 netmask 1840 ttymask 1842
de0: enabling 10baseT port
sd2: no disk label
boot device: sd0
root device (default sd0a): 
dump device (default sd0b): 
file system (default generic): 
root on sd0a dumps on sd0b
root file system type: ffs
de0: enabling 10baseT port
de0: abnormal interrupt: receive process stopped
starting.  named 4.9.6
cache zone "" loaded (serial 0)
primary zone "0.24.151.209.in-addr.arpa" loaded (serial 199803081)
primary zone "128.54.233.205.in-addr.arpa" loaded (serial 199801162)
primary zone "144.54.233.205.in-addr.arpa" loaded (serial 199801271)
primary zone "160.54.233.205.in-addr.arpa" loaded (serial 199801271)
primary zone "176.54.233.205.in-addr.arpa" loaded (serial 199801271)
primary zone "sandelman.ocunix.on.ca" loaded (serial 199801272)
primary zone "sandelman.ottawa.on.ca" loaded (serial 199803141)
Ready to answer queries. 
Starting
Starting
NIS domain name is not set.  NIS ignored.
5.90 3-NetBSD Thu Apr 17 17:15:47 EDT 1997 (1)
tickadj = 40, tick = 10000, tvu_maxslew = 3960, est. hz = 100
precision = 6 usec
read drift of -401.551 from /etc/ntp.drift
de0: 0:e0:29:11:e:72
ncr0: no ccb.
sd3: not queued, error 5