Hitachi G200 - Page 115

Observing bend radius values
Ne
ver bend cables beyond their recommended bend radius. The following table provides
general guidelines for minimum bend radius values, but you should consult the
recommendation of your cable manufacturer.
Cable type
Minimum bend radius
values
Fibre Channel 1.73 inch (40 mm)
iSCSI optical 1.73 inch (40 mm)
Category 5 Ethernet Four times the outside
diameter of the cable
SAS 1.73 inch (40 mm)
Protecting cables
Damage to your Fibr
e Channel and Ethernet cables can aect the performance of your
storage system. Observe the following guidelines to protect the cables:
■
Keep cables away from sharp edges or metal corners.
■
When bundling cables, do not pinch or constrict the cables.
■
Do not use zip ties to bundle cables. Instead, use Velcro hook-and-loop ties that do
not have hard edges and which you can remove without cutting.
■
Never bundle network cables with power cables. If network and power cables are not
bundled separately, electromagnetic interference (EMI) can aect your data stream.
■
If you run cables from overhead supports or from below a raised oor, include
vertical distances when calculating necessary cable lengths.
■
If you use overhead cable supports:
●
Verify that your supports are anchored adequately to withstand the weight of
bundled cables.
●
Gravity can stretch and damage cables over time. Therefore, do not allow cables to
sag through gaps in your supports.
●
Place drop points in your supports that permit cables to reach racks without
bending or pulling.
Cabling full-width modules
When cabling full-width modules, route the cables horizontally, so that they do not
interfere when replacing a module.
Ensuring adequate airow
Managing data cables
Appendix F: Data and power cables
Hitachi Virtual Storage Platform G200 Hardware Reference Guide 115