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Each drive adds its performance to the sum, so more drives will be faster than less drives, all else being equal. The size doesn't directly have an effect, though. If you have a choice between 2.5 inch 300GB 10k RPM drives and 2.5 inch 900GB 10k RPM drives, they'll perform about the same, drive for drive. The difference is when you figure it per TB. So 10 TB ...


Yes. More spindle = higher IOPS. Provided that the smaller drives are similar, performance-wise, to the larger drives (i.e., similar interface and similar RPM).


You can't use non-HP SSDs in HP ProLiant servers like this. Just because this worked on your G7 server doesn't mean it is okay for your Gen8 ProLiant servers. (basically, why buy enterprise gear, then cripple it with incompatible components?) Please see: 3rd party SSD drives in HP Proliant server - monitoring drive health or Third-party SSD solutions ...


Not particularly familiar with adaptec, but with most RAID controllers only a disk designated as hot-spare is automatically used to rebuild an array after failure of one of the active drives. Replacing a failed disk with a new one normally does not automatically trigger an array rebuild. That requires administrator input. A quick glance in the manual ...


From what I have read RAID 10 should be faster than RAID 5 with the same "one-disk loss ok" redundancy. I don't agree. Let's look at reads -- here, there's no reason there should be any difference. Both let you read data from all four drives and use their full bandwidth. With RAID 5, no parity is read unless it's needed, so no difference there. Now, ...


I don't thing striping RAID is of any use with an SSD. Striping distrubutes work over several disk heads, but SSDs already have excellent random access.

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