I backup zfs data to ibm lto4 tape drive using zfs send then dd to tape with transfer rate about 30MB/s but when I try to restore using dd from tape drive it transfer rate is about 7MB/s. Is this normal transfer rate of lto4 tape drive on solaris 10?
my command to restore from tape
dd if=/dev/rmt/0cbn of=/dev/null bs=131072
What am I doing wrong? from lto4 datasheet say it transfer rate about 30MB/s - 120 MB/s