Cabinet Configuration Guidelines
shelves will have better performance than two SAS HBAs with four chains and eight disk
shelves.
■
To maximize performance, do not attach more than four DE2-24C, DE2-24P, or DE3-24C
disk shelves to a single chain, and do not attach more than three DE3-24P disk shelves to a
single chain. This only applies to systems that are performance critical. The maximum of six
disk shelves per chain is available for cases where capacity is preferred over performance.
Cable Lengths
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Active optical cables (AOCs) are required for attaching ZS9-2 and ZS7-2 controllers to
DE3-24 disk shelves. Other controllers and/or disk shelves in the future may use AOC
cabling. AOCs are available in the following lengths: 3 meters, 6 meters, and 20 meters.
The maximum AOC length between a controller and disk shelves that span further than two
adjacent cabinets is 20 meters.
■
DE2-24 disk shelves with specific drive types (see “Cabling Mixed DE3-24 and DE2-
24 Disk Shelves to ZS9-2 High-end (HE) Controllers” in Oracle ZFS Storage Appliance
Cabling Guide are supported by ZS9-2 controllers and require SAS copper cabling
connections. DE2-24 disk shelf connection to ZS7-2 controllers is supported in software
release OS8.8.4 and later. Available copper cable lengths between the ZS9-2 controller or
the ZS7-2 controller and the DE2-24 disk shelf are 3 meters and 6 meters.
■
The maximum copper cable length between a controller and disk shelves is 6 meters.
■
The maximum copper or AOC cable length between DE3-24 disk shelves in a single chain
that spans two adjacent cabinets is 6 meters copper, 6 meters AOC, or 20 meters AOC; only
one pair of 6-meter cables is allowed per chain.
■
The maximum copper cable length between DE2-24 disk shelves that span across adjacent
cabinets is 3 meters.
■
The maximum copper cable length between Sun Disk Shelves that span across adjacent
cabinets is 3 meters.
Cable Bend Radius
Do not bend SAS cables less than the following minimum radius:
SAS Cable Type SAS Cable Length Minimum Bend Radius
Copper 1 meter 26 mm
Copper 3 meters 28 mm
Copper 6 meters 35 mm
20 Oracle ZFS Storage Appliance Installation Guide, Release OS8.8.x • August 2021
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