Compressing to a tape drive

[HC Johnson]

In article <14496 at s.ms.uky.edu>, acp at ms.uky.edu (ACPNET consultant) writes:
> This is on an AT&T 6386 WGS running Sysv/386 3.2.1.
> 
> find . -print | cpio -oc | compress | dd [blocking options] > /dev/rmt/c0s0
> 
> Now, including dd in the pipe is *loads* faster than not including
> it, but I haven't been able to find any dd options which let the 
> tape stream.  It keeps stopping and backing up.  When using something

If you want your tape to screem ( in bursts) try:
dd of=/dev/rmt/c0s0 of=512b
this will output 512 BLOCKS of 512 at a time.  The tape will run continuously
for the big write, then rest while the buffer is refilled by the input to dd.


Howard C. Johnson
ATT Bell Labs
att!lzsc!hcj
hcj at lzsc.att.com