Does anyone have a seagate scorpion 20/40GB tape drive successfully
running on AIX 5.2? If so, I'd like to know what density settings are
working for you.
It is an F50, AIX 5.2 and the drive is a DDS4, STD2401LW.

An old Seagate doc I found said to use blocksize 1024 and to set the
DENSITY setting #1 to 140. But that does not work for me. With density
140 I get this:

# find /tmp -print | backup -ivrf/dev/rmt0
cannot open /dev/rmt0: Invalid argument
Please mount volume 1 on /dev/rmt0
.... and press Enter to continue
<cr>
cannot open /dev/rmt0: Invalid argument
Please mount volume 1 on /dev/rmt0
.... and press Enter to continue

If I set the Density to 0 it will work, but it doesn't seem like
the compression is turned on.
Here's the tctl status output

# tctl -f rmt0.4 status
rmt0 Available 10-60-00-6,0 Other SCSI Tape Drive
attribute value description
user_settable

mode yes Use DEVICE BUFFERS during writes True
block_size 512 BLOCK size (0=variable length) True
extfm yes Use EXTENDED file marks True
maxlun 32 LVD SCSI Tape Drive True
res_support no RESERVE/RELEASE support True
var_block_size 0 BLOCK SIZE for variable length support True
density_set_1 0 DENSITY setting #1 True
density_set_2 0 DENSITY setting #2 True
delay 45 Set delay after a FAILED command True
rwtimeout 900 Set timeout for the READ or WRITE command True
ret_error no RETURN error on tape change or reset True

Regards, John