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most commonly utilized disk controller interfaces.

Architecture

Throughput (theoretical max Megabyte/sec)

iSCSI (Gigabit Ethernet)

125 MB/s

Fibre Channel (2 GFC)

212.5 MB/s

SATA (SATA II)

300 MB/s

SCSI (U320)

320 MB/s

SAS

375 MB/s

Fibre Channel (4 GFC)

425 MB/s

Fibre Channel (8 GFC)

850 MB/s

iSCSI (10 Gigabit Ethernet)

1250 MB/s

Recommendation

SATA II or SAS are recommended for the Single Host Server architecture pattern, with SAS being the preferred option.

Controller Cache Storage controller cache can improve performance during burst transfers or

when the same data is accessed frequently by storing it in the cache memory, which is typically several orders of magnitude faster than the physical disk I/O.

Recommendation

When comparing similar storage controllers or selecting storage controller options, select those that have a larger and faster cache memory.

Controller Channels The number of internal and external channels that a storage controller has can

substantially impact overall storage performance. Multiple channels increase the amount of simultaneous read and write IO operations (IOPS) that can be performed, especially when using advanced RAID arrays.

Recommendation

Utilize a minimum of a 2-channel storage controller for the Single Host Server architecture pattern. Utilize one channel for the RAID 1 system partition and

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