10-20-2011
You only get to do bs=...G if you have GNU dd.
Advertised tape sizes are very often inflated. We don't know his tapes actually are 600GB, i.e. whether that means real gigabytes or drivemaker's gigabytes, uncompressed or with theoretical max compression, etc. The only way to be sure of that is to use the capacity in blocks as defined by the manufacturer.
Blocks versus bytes is grade-school math, 1024 bytes is two 512-byte blocks...
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LEARN ABOUT OPENSOLARIS
dda
dda(7D) Devices dda(7D)
NAME
dda - MMS disk archiving driver
SYNOPSIS
/devices/pseudo/dda@lun:bn
DESCRIPTION
The Media Management System (MMS) is a distributed removable media management system based on the IEEE 1244 Media Management System speci-
fication. MMS provides a uniform and consistent tape interface to client applications.
The dda driver is a pseudo tape drive with filesystem file media. The dda driver is a minimal emulation of the st(7D) tape driver mtio(7I)
interface with BSD no-rewind behavior and is used for MMS disk archiving. The dda driver should be used with a MMS MMP mount command han-
dle. You configure DDA tapes, drives, and libraries for disk archiving using the mmsadm(1M) command. You also use mmsadm(1M) to mount and
unmount dda media.
CONFIGURATION
To set the number of disk archiving tape drives available for MMS disk archiving, edit the /kernel/drv/dda.conf configuration file. The
default number of disk archiving tape drives is 20.
The disk archiving tape drive devlinks are located in the /dev/dda directory.
The DDA maximum block size is 262144 bytes and the minimum is 1 byte.
FILES
/kernel/drv/dda 32-bit kernel module (x86)
/kernel/drv/sparcv9/dda 64-bit kernel module (SPARC)
/kernel/drv/amd64/dda 64-bit kernel module (x86)
/kernel/drv/dda.conf dda configuration file
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+--------------------+---------------------------------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+---------------------------------------------------------+
|Architecture | SPARC, x86 |
+--------------------+---------------------------------------------------------+
|Availability | SUNWmmsr |
+--------------------+---------------------------------------------------------+
|Interface Stability | Uncommitted |
+--------------------+---------------------------------------------------------+
SEE ALSO
mt(1), mmsadm(1M), attributes(5), dmd(7D), st(7D), mtio(7I)
IEEE 1244 Removable Media Standards Specification -- IEEE, 2000
SunOS 5.11 17 Oct 2008 dda(7D)