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Performance Tuning Guidelines for Windows Server 2008 R2 April 12, 2013 Abstract
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There are many considerations in choosing a storage array and adapters. The choices include the type of storage communication protocols that you use, including the options shown in Table 8.
Table 8. Options for Storage Array Selection
Option
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Description
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Fibre
Channel or SCSI
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Fibre Channel enables long glass or copper cables to connect the storage array to the system and provides high bandwidth. SCSI provides high bandwidth, but it has cable length restrictions.
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SAS or SATA
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These serial protocols improve performance, reduce cable length limitations, and reduce cost. SAS and SATA drives are replacing much of the SCSI market. In general, SATA drives are built with higher capacity and lower cost targets than SAS drives; the premium associated with SAS is typically attributed to performance.
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Hardware RAID capabilities
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For maximum performance and reliability, the enterprise storage controllers should offer RAID capabilities. RAID levels 0, 1, 0+1, 5, and 6 are described in Table 9.
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Maximum storage capacity
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Total usable storage space.
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Storage bandwidth
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The maximum peak and sustained bandwidths at which storage can be accessed are determined by the number of physical disks in the array, the speed of the controllers, the type of bus protocol (such as SAS or SATA), the hardware-managed or software-managed RAID, and the adapters that are used to connect the storage array to the system. Of course, the more important values are the achievable bandwidths for the specific workloads to be executed on servers that access the storage.
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