Maximum Queued I/O Count; Fibre-Host Raid Connections - Advantech ASR-5300I Series User Manual

3.2.4

Maximum Queued I/O Count

The "Maximum Queued I/O Count" menu option enables users to set the maximum
number of I/O operations that can be accepted from servers per host channel. The
predefined range is 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 and size of drives. However,
the optimum performance is typically achieved using the "Auto" or "256" settings.
For more information, please refer to the Firmware Manual.
3.3

Fibre-Host RAID Connections

The Fibre Channel standard allows optical connections. Optical cables can be used
over longer distances and have demonstrated more reliable performance. Because
of the demands of high transfer rates, optical cables are preferred for 16/8/4Gbps
fiber connectivity. Optical cables are also less susceptible to EMI.
The Fibre host ports can connect to Fibre Channel host adapters (HBA) that feature a
8Gbps transfer rate, SFP interface, support for full-duplex transfers, and, ideally, also
feature a 64-bit/133MHz PCI-X or PCI-E interface. Please contact your vendor for the
latest certified items.
Warning! All Fibre cables are sensitive and must be handled with care. To avoid
interference, the cable routing path must be carefully planned and the
cables not bent.
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