EonStor DS S12/S16/S24 Series Hardware Manual
3.1.4
Maximum Queued I/O Count
The "Maximum Queued I/O Count" menu option enables you to configure the
maximum number of I/O operations per host channel that can be accepted from
servers. The predefined range is from 1 to 1024 I/O operations per host channel, or
you can choose the "Auto" (automatically configured) setting. The default value is
256 I/O operations.
The appropriate "Maximum Queued I/O Count" setting depends on how many I/O
operations the attached servers are performing. This can vary according to the
amount of host memory present as well as the number of drives and their size. If you
increase the amount of host memory, add more drives, or replace drives with higher
performance, you might want to increase the maximum I/O count. But usually,
optimum performance results from using the "Auto" or "256" settings.
For more information, please refer to the firmware Operation Manual that came with
your system.
3.2
Fibre-Host RAID Connections
The Fibre Channel standard allows for both copper and optical connections. Copper
cable is cheaper but limited to lengths of less than 30m (33 yards). Optical cables
can be used over longer distances and have been shown to be more reliable. Due to
the demands of high transfer rates, optical cables are preferred for 8/4Gbps fiber
connectivity. Optical cables are also less susceptible to EMI.
The following transceiver and cables have been tested and proven to be compatible
with your systems.
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