Sorry for the repost, the message ran away before I had finished it.
Using DLTtape IV tapes, a DLT7000 is able to store 35GB, 70GB with
compression. A DLT8000 is able to store 40GB, 80GB with compression. A
DLT4000 is able to store 20GB, 40GB with compression. The transfer rates are
also slightly different, DLT7000 will write at 5MB/second, 10MB/second for
compressed data. A DLT8000 will write at 6MB/second, 12MB/second for
compressed data. A DLT4000 will write 1.5MB/second, 3 MB/second for
compressed data. For a DLT8000, the recording format will be DLT8000; for a
DLT7000, the recording format will be DLT7000 and for the DLT4000, the
recording format will be DLT4000. (The DLT8000 can read all recording
formats, the DLT7000 can read the DLT7000 and DLT4000 formats, the DLT4000
can only read the DLT4000.)
Using DLTtape III tapes, DLT4000, DLT7000 and DLT8000 drives will all store
10GB, 20GB with compression. The transfer rate will be 1.25 MB/second for
all drives, 2.5 MB/second with compression. The recording format will be
DLT2000 for all drives.
Using DLTtape IIIXT tapes, DLT4000, DLT7000 and DLT8000 drives will all
store 15GB, 30GB with compression. The transfer rate will be 1.25 MB/second
for all drives, 2.5 MB/second with compression. The recording format will be
DLT2000XT for all drives.
(The above situation is analogous to the DDS formats, newer drives require
newer tape formats to achieve their stated speed and capacity. Do not
expect to get any type of speed or capacity using a 90-meter tape in a
DDS-III drive, you must use a 125-meter tape. However, you can send stuff
back and forth between different drives using a 90 meter tape. Beware
compression.)
Depending on what your plans are, you may want to look at SDLT.
Kind regards,
Denys. . .
Denys Beauchemin
HICOMP
(800) 323-8863 (281) 288-7438 Fax: (281) 288-7438
denys at hicomp.com www.hicomp.com
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On Behalf Of
Richard Gambrell
Sent: Friday, February 15, 2002 12:05 PM
To: [log in to unmask]
Subject: Re: DLT drives
Denys Beauchemin wrote:
>
> Sorry, I missed the second half of the question. Yes, the DLT8000 can
write
> tapes which can be read on the DLT4000, but you must use DLTIII tapes in
> order to do this. I do not have any DLT4000 drives handy to test this,
but
> the www.quantum.com specs for the 8000 show this to be true.
How much difference is there between a 8000 and 7000? We're
thinking about consolidation of three separate DLT7000 libraries.
Richard
>
> Kind regards,
>
> Denys. . .
>
--
Richard L Gambrell, Senior Information Technology Consultant and
Director of Computing Systems and Networks
Information Technology Division, University of Tennessee at Chattanooga
Fax: 423-755-4150 Support Help-Desk: 423-755-4000
Direct phone: 423-755-5316 ITD Business Office: 423-757-1755
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