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Gen8 Sata port speed


pigr8
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Does anyone know if the gen8 has some bandwidth limitation on port 2 and 3?

i noticed yesterday using smartctl that port 0 and 1 (first two slot) are sata 6Gbp/s but port 2 and 3 (last two) are 3Gbp/s, both sata gen3 (3.1 says).

 

any confirmation?

user@GEN8:/# smartctl -i /dev/sda
smartctl 6.5 (build date Aug  2 2016) [x86_64-linux-3.10.77] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda 7200.14 (AF)
Device Model:     ST3000DM001-1CH166
Serial Number:    Z1F4FTTZ
LU WWN Device Id: 5 000c50 065b8446a
Firmware Version: CC29
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Nov 16 23:50:10 2016 CET

user@GEN8:/# smartctl -i /dev/sdc
smartctl 6.5 (build date Aug  2 2016) [x86_64-linux-3.10.77] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda 7200.14 (AF)
Device Model:     ST3000DM001-1ER166
Serial Number:    W500Y6Z6
LU WWN Device Id: 5 000c50 07d54590f
Firmware Version: CC25
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Wed Nov 16 23:50:45 2016 CET
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Just a quick Q, how does that impact read/write speeds when using all four disks as RAID 1+0? Does it force the lot to operate at the lower speed or does it pair two at RAID 1 for striping and the other two for mirroring on a 4 disk RAID?

 

Sent from my Nexus 6 using Tapatalk

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Just a quick Q, how does that impact read/write speeds when using all four disks as RAID 1+0? Does it force the lot to operate at the lower speed or does it pair two at RAID 1 for striping and the other two for mirroring on a 4 disk RAID?

 

Sent from my Nexus 6 using Tapatalk

Not sure how the B120i pairs up the drives in RAID10, I will look the next time I play with it. It should have a very minimal effect as SATA2 speeds are still faster than sustained transfer rates of disk drives. The only time a disk drive can deliver data faster than SATA2 would be a read from cache on the drive.

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