EonStor DS S48 Series Hardware Manual
it is preferred that all the disk drives within a chassis have the same
capacity. Tiered storage configuration is supported, e.g., 150GB SAS
drives in your RAID enclosure and 750GB SATA drives in JBODs.
However, you should not include both SAS and SATA drives in a logical
drive.
A spare drive should have a minimum capacity that is equivalent to the
largest drive that it is expected to replace. If the capacity of the spare is
less than the capacity of the drive it is expected to replace, the controller
will not proceed with the failed drive rebuild.
When rack-mounted, leave enough slack in the cables so that they do
not bend to a diameter of less than 76mm (3 inches) when.
Route the cables away from places where it can be damaged by other
devices, e.g., foot traffic or fan exhaust.
Do not over-tighten or bend the cables.
3.1.1
Host-Side Topologies
The primary concern for configuring host-side topologies is to avoid points of failure.
It is therefore recommended that the host ports be connected to at least two (2)
HBAs. It is also preferable to apply Fibre Channel switches for Fibre host RAID
systems.
NOTE
In order to manage the fault-tolerant data paths and to optimize data throughput on
multiple data paths, it is necessary to apply EonPath multi-pathing software or
utilities such as Linux Device Mapper.
3.1.2
Host-Side Parameters
It will be necessary to fine-tune your host-side parameters if you are attaching the
S48 systems in a complex, multi-host SAN environment. The options can be found in
terminal console with firmware in Main Menu -> View and Edit Configuration
Parameters -> Host-side Parameters. For example, you may need to enlarge values
for the following parameters:
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