When trying to use "ufsdump 0f /dev/rmt/0cn /usr" I get the following
error....

DUMP: Unexpected condition detected: /dev/rmt/0cn must have exactly
one link.
DUMP: Needs Attention: cannot open 'eagle:/dev/rmt/0cn'

The drive is OK - I can dump to /dev/rmt/0c, tar also works to /dev/
rmt/0cn.
boot -r did not fix it.
Sun external scsi tape (Exabyte 8900 Mamoth) on Solaris 9

f.nardis@gmail.com wrote:
> When trying to use "ufsdump 0f /dev/rmt/0cn /usr" I get the following
> error....
>
> DUMP: Unexpected condition detected: /dev/rmt/0cn must have exactly
> one link.

Never seen that before, but it's explained in the source code:
http://cvs.opensolaris.org/source/xr...ump/dumpmain.c


1482 * Bad link count implies someone's linked our
1483 * target to something else, which we probably
1484 * shouldn't step on.
1485 */
1486 if (post_lstat.st_nlink != 1) {
1487 errtext = gettext(
1488 "Unexpected condition detected: %s must have exactly one link\n"),
1489 msg(errtext, filename);
1490 syslog(LOG_WARNING, errtext, filename);
1491 (void) close(fd);
1492 errno = EPERM;
1493 return (-1);
1494 }


So check if anyone made a hard link to the device, check the link count with ls
-li, ls -liL and find the other links that have the same inode.