Don't forget to factor in drive compression.  I have seen 4 to 1, which
requires 60 MB/sec bandwidth to keep the LTO drive streaming.  (If an LTO
doesn't stream, figure 1.5 to 6 MB/sec before compression, depending on
file size)

Orville L. Lantto
Datatrend Technologies, Inc.
121 Cheshire Lane #700
Minnetonka, MN 55305
Email: orville.lantto AT dtrend DOT com
V: 952-931-1203
F: 952-931-1293
C: 612-770-9166




"Taylor, David" <DTaylor AT WBMI DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
12/20/01 09:20 AM
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        SCSI Channel to LTO drive rule of thumb


Hi *,

Can anyone share with me, a good rule-of-thumb for the maximum number of
LTO
drives that should be attached to a single Ultra-II SCSI bus?   Using the
theoretical max transfer rates of 15 MB/s for the drives and 80 MB/s for
the
SCSI, I shoould be able to put 5 drives on one bus and still have room to
spare (theoretically).    What is the generally accepted maximum number,
in
the real world?

TIA

David Taylor



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