Towers, racks, and high-speed link 295
Draft Document for Review October 18, 2004 5486Towr.fm
are described in IBM Eserver iSeries Migration: System Migration and
Upgrades at V5R1 and V5R2, SG24-6055.
.
HSL OptiConnect
In system complexes that contain only V5R1 HSL hardware, the HSL
OptiConnect loop implementation consists of loops that may contain up to four
PCI/PCI-X I/O towers and units or external xSeries servers between two iSeries
servers. The same is also true for V5R2 scenarios. However, V5R2 allows for
three iSeries servers to be connected on an HSL OptiConnect loop. When there
are three iSeries servers on a loop, there cannot be any I/O towers or external
xSeries servers on that loop.
In an HSL OptiConnect loop, external xSeries servers count against the per loop
tower limits. Depending on the number of towers and the number of I/O
operations performed in these towers, overall system performance may be
impacted.
HSL copper
The IBM Eserver i5 models have HSL-2/RIO-G ports to serve loops at a
maximum speed of 2 GB per second. Only a limited number of towers can be
enabled for this higher speed.
New Server
Model
Copper HSL Cables
3, 6 and 15 meter
HSL Loop
Switchable
Tow er (IASP)
PCI Expansion
Tow er
xSeries for
iSeries
New Server
Model
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