If one disregards the rotational speed and access time advantage that
SAS drives have over SATA, does the SAS interface offer any performance
advantage?
For example, assume a SAS drive and a SATA drive can both sustained
stream 70MB/s. A 16 drive JBOD SAS enclosure with internal SAS expander
is connected via a 4port SAS RAID controller, configured for RAID 5
across all 16 drives.
If tests are then run reading and writing a multi gigabyte file to empty
arrays made up of 16 SAS drives and 16 SATA drives, would the results be
identical?
I ask, as I have seen a comment to the effect that SATA drives are less
efficient interacting at the bus/interface level in this situation, but
I have had no luck confirming this after extensive searching.
Regards,
Richard
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