Compressing to a tape drive

HC Johnson hcj at lzsc.ATT.COM
Sat Mar 10 05:46:28 AEST 1990

In article <14496 at>, acp at (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
hcj at

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