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You must also take note of these considerations:
•
A spare drive that carries no data stripes and does not contribute to disk-level
performance. For performance data information of your hard drive, refer to its
documentation.
•
Disk drives in the same logical array must have the same capacity, but it is
preferred that all drives in the chassis have the same capacity.
•
Disk drives in the same logical drive must have the same capacity, but it is preferred that
all disk drives in a chassis have the same capacity. Tiered storage configuration is
supported in this setup. However, you must not include both SAS and SATA drives in a
logical drive.
•
A spare drive must have a minimum capacity equivalent to the largest drive that
needs replacement. If the capacity of the spare drive is less than the capacity of
the drive to be replaced, the controller will not proceed with the failed drive
rebuild.
•
When rackmounting, leave enough space for the cables. DO NOT bend them to
a diameter of less than 76mm (3in).
•
When connecting between devices, follow all the specifications. Pay attention to
the signals and avoid electronic noise from adjacent interfaces. DO NOT put
power cords on optical cables.
•
Route the cables away from places where it can be damaged by other devices
such as fan exhaust or foot traffic.
•
DO NOT over-tighten, twist, or bend the cables.
Configuring the Host-Side Topologies
When configuring host-side topologies, avoid the points of failure. It is recommended that the
host ports are connected to at least two HBAs.
NOTES:
•
To manage the fault-tolerant data paths and optimize data throughput on multiple data
paths, you must apply MPIO software or other multipathing utilities such as Linux Device
Mapper.
•
Host port channel designation may vary by system. Refer to the topologies of this manual
to create your own connections that suit your needs.
Configuring the Host-Side Parameters
For the host-side parameters, we strongly recommend that you use the default settings of your
system. If you need to adjust the host-side parameters, consult your on-site technical personnel
or seek technical support from your vendor.
Familiarizing the Maximum Concurrent Host LUN Connection
(Nexus in SCSI)
The menu option
Max Number of Concurrent Host-LUN Connection
allows you to set the
maximum number of concurrent host LUN connections. This is the arrangement of the controller
internal resources to use with a number of current host nexus.
