Data point: I have a pair of diskful 4M 3/50's running stripped-down 1.4
kernels which are DNS servers. They swap a bit when I do anything at the
console but as long as they're left alone they're fine.

   --James B.

NetBSD 1.4 (DNS) #0: Fri Dec  3 19:00:56 PST 1999
    jwbirdsa@carfallin:/var/qmail/DNS
Model: sun3 50
fpu: mc68881
real  mem = 4096K (0x400000)
avail mem = 2800K (0x2bc000)
using 38 buffers containing 311296 bytes of memory
mainbus0 (root)
obio0 at mainbus0
zsc0 at obio0 addr 0x0 ipl 6: (softpri 3)
zsc0:  channel 0 not configured
zsc0:  channel 1 not configured
zsc1 at obio0 addr 0x20000 ipl 6: (softpri 3)
zstty0 at zsc1 channel 0 (console)
zstty1 at zsc1 channel 1
eeprom0 at obio0 addr 0x40000
clock0 at obio0 addr 0x60000 ipl 5
memerr0 at obio0 addr 0x80000 ipl 7: (Parity memory)
intreg0 at obio0 addr 0xa0000
le0 at obio0 addr 0x120000 ipl 3: address 08:00:20:00:06:c7
le0: 8 receive buffers, 2 transmit buffers
si0 at obio0 addr 0x140000 ipl 2: options=0xf
scsibus0 at si0: 8 targets, 8 luns per target
sd0 at scsibus0 targ 0 lun 0: <EMULEX, MD21/S2     ESDI, A00> SCSI0 0/direct fix
ed
sd0: 137MB, 830 cyl, 10 head, 33 sec, 512 bytes/sect x 280840 sectors
scsibus0 targ 0 lun 1: <EMULEX, MD21/S2     ESDI, A00> SCSI0 0/direct fixed not 
configured
enabling interrupts
boot device: sd0a
root on sd0a dumps on sd0b