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I was investigating the SATA info for my ssd to determine whether I could enable mount option "discard=async". I found the info, but I'm puzzled about something else:
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Is it not getting the full speed because it is plugged into the wrong SATA port? I installed it a long time ago, but I'm fairly certain I plugged it into a SATA 3 port. The PC is fairly old (ca 2011), though, so maybe they didn't even have SATA 3.1 back then. The motherboard is a Gigabyte Z68A-D3-B3.
Here are the motherboard specs for the storage interface:
2 x SATA 6Gb/s connectors (SATA3_0, SATA3_1) supporting up to 2 SATA 6Gb/s devices
4 x SATA 3Gb/s connectors (SATA2_2~SATA2_5) supporting up to 4 SATA 3Gb/s devices
Support for SATA RAID 0, RAID 1, RAID 5, and RAID 10
* When a RAID set is built across the SATA 6Gb/s and SATA 3Gb/s channels, the system performance of the RAID set may vary depending on the devices being connected.
Last edited by ratcheer (2020-06-23 11:33:00)
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I'm sorry. I should just open up the case and check that the ssd is plugged into a SATA 3 port on the motherboard.
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Ok, the drive is definitely plugged into one of the SATA 3 ports. So, I still don't understand why a 6 Gb/sec drive in a 6 Gb/sec port is only running at 3 Gb/sec. Do I need some additional mount option?
smartctl 7.1 2019-12-30 r5022 [x86_64-linux-5.7.4-arch1-1] (local build)
Copyright (C) 2002-19, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Samsung based SSDs
Device Model: Samsung SSD 850 PRO 256GB
Serial Number: S1SUNSAFB27444M
LU WWN Device Id: 5 002538 8a081f996
Firmware Version: EXM01B6Q
User Capacity: 256,060,514,304 bytes [256 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: Solid State Device
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2, ATA8-ACS T13/1699-D revision 4c
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is: Tue Jun 23 06:30:52 2020 CDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
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Check the cable and the mechanical connection on both sides, use shorter cable and make sure the cable is rated for 6Gb/s. In an unlikely circumstances, you may have faulty, marginal board/chipsets or the drive itself that 6Gb/s link negotiation simply failed.
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Thank you, @liewkj
I thought to check the HDD that is plugged into the same SATA port (which has two receptacles); it IS running at 6 Gb/sec. Of course, it is using a different cable. I will try to get into the case and look at all that, though.
So, the chipset is capable of the full speed. I still need to inspect the SSD's cable and its firmware (which I have asked about in another thread).
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Updated firmware to "Firmware Version: EXM04B6Q".
I still get "SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)".
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LOL! I was asking the same question about the same device five years ago. Still no progress, but I think I'll just try to buy a shorter, higher quality SATA cable and see if it helps.
https://bbs.archlinux.org/viewtopic.php?id=198404
Also, I researched in Samsung's web site, and the SSD is definitely supposed to be able to do 6 Gb/sec.
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