Rorke Data Galaxy HDX2 GHDX2-2430S-24F4D - Manual (Page 71)

Galaxy GHDX2-2430S/R-24F4D Installation and Hardware Reference Manual
4-4 Subsystem Connection and Operation
Figure 4-1: Drive Mechanical Speed and Logical Drive Speed
There are other considerations. For example, a spare drive carries no data
stripes and will not contribute to disk-level performance. Refer to the
documentation that came with your hard drives for performance data.
• Follow all the Fibre Channel specifications when cabling. Pay attention to
signal quality and avoid electronic noise from adjacent interfaces.
• The disk drives included in the same logical array should have the same
capacity, but it is preferred that all disk drives within a chassis have the
same capacity. Even disk drives of the same model name may carry
different block numbers. One way to get around this issue is to tune down
the “Maximum Drive Capacity” to a lower number. Please refer to your
firmware operation manual for details.
• A spare drive should have a minimum capacity equivalent to the largest
drive that it is expected to replace. If the capacity of the spare is smaller
than the capacity of the drive it is expected to replace, then the controller
will not proceed with the failed drive rebuild.