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July 17th, 2019 10:00
Raid Performance with 12gb/s array & 6gb/s array on single PERC H730p
My question is simple... I've got a PERC H730p Raid card in my Dell R740 with 16 bays. I have 10 drives that are 800gb 12gb SAS SSD in a Raid array, and then 4 1.6tb 6gb in a Raid array. My question is will the 12gb array maintain it's true 12gb transfer rate if I have a separate 6gb array on the same card, or will it clock the 12gb one down? I know that if I were to mix the drives in a single array it will use the lower speed. This is not the case. These are separate arrays. Thanks!
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Daniel My
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July 17th, 2019 12:00
Hello
Drive transfer speeds can be mixed across the controller. You can mix transfer speeds like SAS 6Gb/s and SAS 12Gb/s in both a virtual disk and across the controller. You can also mix drive access speeds within a virtual disk or across the controller.
If you have a virtual disk with five 12Gb/s 15000 RPM drives and one 6Gb/s 7200 RPM drive all drives will operate at their rated transfer speed and internal access speeds. Having that 6Gb/s 7200 RPM drive in that scenario will likely affect performance of the virtual disk. The other drives will still operate at 12Gb/s 15000 RPM, but the controller may have to wait on the slower drive to perform actions. The slower drive could create a bottleneck within the virtual disk.
http://www.dell.com/storagecontrollermanuals/
Thanks