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Old 02-16-2019, 05:26 AM   #1
milad_meidanshahi
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SATA speed downgraded after Change to SSD


Hi i have HP Pavilion 15-n243cl Notebook and i have change the default normal HDD drive to Samsung SSD evo 860. Before change HDD drive when i run:

Code:
sudo smartctl -a /dev/sda | grep SATA
i got the result:

HDD: SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)

but after changing to SSD the result changed to

SSD: SATA Version is: SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)

It's interesting that when my laptop goes to suspend mode after login again SATA version and speed on SSD get back to 6.0Gb/s. :|

I'll be happy with any help.
 
Old 02-17-2019, 01:56 PM   #2
business_kid
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I'd be more interested in the output of
Code:
hdparm -Tt /dev/sda
before and after the disk swap. If you're replacing a mechanical disk with a SSD, I'd be extremely surprised if hdparm doesn't show an improvement.
 
Old 02-21-2019, 10:01 AM   #3
milad_meidanshahi
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Result:

Code:
/dev/sda:
 Timing cached reads:   2976 MB in  2.00 seconds = 1488.56 MB/sec
 Timing buffered disk reads: 818 MB in  3.00 seconds = 272.33 MB/sec
 
Old 02-22-2019, 01:57 AM   #4
mrmazda
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It's far worse here. My PNY SSD seems slower than an old USB2 stick:
Code:
 hdparm -tT /dev/sda /dev/sdb /dev/sdc

/dev/sda:
 Timing cached reads:   11598 MB in  2.00 seconds = 5810.82 MB/sec
 Timing buffered disk reads:  24 MB in  3.35 seconds =   7.16 MB/sec

/dev/sdb:
 Timing cached reads:   10070 MB in  2.00 seconds = 5045.46 MB/sec
 Timing buffered disk reads: 328 MB in  3.02 seconds = 108.54 MB/sec

/dev/sdc:
Timing cached reads:   13332 MB in  1.99 seconds = 6685.97 MB/sec
Timing buffered disk reads: 362 MB in  3.01 seconds = 120.41 MB/sec
This is a recent development. When new it was:
Code:
Timing cached reads:   13612 MB in  2.00 seconds = 6821.61 MB/sec
Timing buffered disk reads: 770 MB in  3.00 seconds = 256.62 MB/sec
 
Old 02-22-2019, 04:07 AM   #5
business_kid
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Boy, sda IS slow. The only time I saw that low a speed was when I had some 'generic' pci or pcie driver loading, so the correct driver was never loaded for the chipset. I solved it by compiling in the correct driver, and then not compiling the generic one, but I'm sure it could have been done with module options.
 
Old 02-23-2019, 12:30 AM   #6
milad_meidanshahi
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My main problem is why my SATA version is STAT2 instead of SATA3 my laptop support SATA3
 
Old 02-23-2019, 03:59 AM   #7
business_kid
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Probably incorrect driver using some fallback arrangement. Have a look at the logs, which can give hysterical sounding error messages on things like this. I had a motherboard with lousy hardware and the distro kernel would put all sorts of histrionics into the logs, but it booted. A home compilation sorted that.
 
  


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