I have a U5 with a 4gig Sun IDE disk and a SymBios SCSI controller with
a Seagate 18gig Ultra SCSI disk.

I've been moving stuff around from IDE to SCSI by using the command:

sidewinder# cd dir1;tar cvf - . |(cd dir 2; tar xfBp -)

This seems to result in truncated or munged files at the end of the
transfer.

Using cp seems to work all right.

I wonder if it is a pipe problem compounded by the difference in drive speed.

wd0 at pciide0 channel 0 drive 0: <ST34321A>
wd0: drive supports 32-sector PIO transfers, LBA addressing
wd0: 4103 MB, 8894 cyl, 15 head, 63 sec, 512 bytes/sect x 8404830 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
wd0(pciide0:0:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)

sd0 at scsibus0 target 0 lun 0: <SEAGATE, ST318418N, 0003> SCSI3 0/direct fixed
sd0: 19001 MB, 26434 cyl, 2 head, 736 sec, 512 bytes/sect x 38914049 sectors
sd0: sync (50.0ns offset 16), 8-bit (20.000MB/s) transfers, tagged queueing

-- 
Rick Kelly  rmk@rmkhome.com  www.rmkhome.com