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SATA/SAS are not like hubs, rather they work much like a network switch. This means that a single SATA/SAS port provides the entire advertised banwdwith, independetly from the other ports. In other words, a chipset providing 4x SATA 3.0 ports (6 Gb/s each) has a "SATA backplane" switching capability of 4x6 Gb/s = 24 Gb/s. For a 4x SAS 3.0 ports (12 Gb/s ...


Modern HDD drives have a specific SATA command to limit the number of LBAs/sectors reported to the BIOS/OS. Can you issue smartctl <disk> and hdparm <disk> -N ? However, pay attention to not insert a numeric value after hdparm -N, and be sure to read the Host protected area section of hdparm manpage


It is 6 Gb/s per port, with 8 ports you can get up to 48 Gb/s total. For SAS controllers and disks, you can use "SAS Expanders" to connect one SAS port to multiple drives. In this case, all drives connected to one SAS port share the total 6 Gb/s bandwidth. For this reason, for maximum performance we avoid SAS expanders and use controllers like the LSI ...

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