heh well I guess fast and slow is subjective, 50 second average seek time seems like a long time to me
I think You will not be able to flip through a bunch of >= 100 DVD's in 50 sec
And the Backup Software is also able to maintain a adjustable disk cache...
As long as all the tapes fit in the library all will be fine.
At home i use two Seagate GoFlex Net running Debian 6 with 1x 1 TB and 2x 2 TB attached on each system.
The 2 TB drives are working in RAID-1 and are mounted read-only normally.
Actual data is written only to the 1 TB drive.
One system is cold standby only.
Once a week the data on the RAID-1 array of the standby system gets a refresh from the active system
where the data from the 1 TB drive and the data from the RAID-1 of the operational system will be merged.
The standby system will then become the master for a week.
This gives me three versions for each file i work on and two versions for older files.
In the near future i will test ZFS for the cache to make a daily snapshot.
But i think at christmas i will add a LTO-4 drive and a spare GoFlex