Jim Rees wrote:
>
> I'm considering buying a Quantum DLT4000 to back up my cell. I have a
> single file server, a Sparcstation 20, with a few 18 GB disks on a fast-wide
> scsi controller. I'll put the tape on the built-in narrow scsi controller.
>
> Will the Sparcstation 20 be able to keep the DLT streaming? If not, how
> horrible will it be? Should I be looking at something else?
The DLT4000 tape has a maximum of 1.5 MegaBytes/sec uncompressed, this
is
the speed data can be read/written to tape. If hardware compression is
used and a 2:1 ratio is assumed this is doubled. A narrow scsi 2
interface
on a Sun has a maximum transfer rate of 10 MegaBytes/sec.
My tape is on the sparc20 the built in scis-2 bus with no other
devices just like you plan.
As long as you can keep the tape busy you should be able to keep the
tape streaming. I have a DLT4700 wich contains a DLT4000 tape unit
on a sparc 20 and use legato software to backup my non-afs filesystems.
The performance is pretty good and I have not had a problem.
By the way the DLT7000 tape interface speed is 5Gb/10GB
compressed/uncompressed and the new DLT8000 6GB/12GB. I have read
that the DLT7000 will be phased out because the price on the
7000 and 8000 are going to be the same. The 7000 holds 35GB/70GB
and the 8000 40GB/80GB. Note they all require the same expensive
"CompacTape IV" tape.
If I was going to purchase
a DLT drive I would go for the 8000. The 4000 is getting a little
old. See http://www.quantum.com/ Quantum makes all these drives.
--
John W. Sopko Jr. University of North Carolina
email: [EMAIL PROTECTED] Computer Science Dept., CB 3175
Phone: 919-962-1844 Sitterson Hall; Room 135
Fax: 919-962-1799 Chapel Hill, NC 27599-3175
