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I have some concerns about disk throughput in order to plan my SQL Server deployment. I know from experience that consumer SATA disks sometimes go into sleep mode when not used for a longer period. Do SAS server drives always rotate at default speed (like 10K, 15K) ? So they maintain maximum speed all the time but also consume more energy all the time.

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  • Note that you can control this behavior on consumer-grade drives using hdparm. Commented May 22, 2015 at 13:41

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Yes, enterprise SAS disks spin at a fixed rotation speed.

They will not go into power or energy-saving modes like certain consumer drives.

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