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Re: Question: SSD speed

From Sven Hartge <sven@svenhartge.de>
Newsgroups linux.debian.user
Subject Re: Question: SSD speed
Date 2020-10-07 12:50 +0200
Message-ID <AXfbb-5va-1@gated-at.bofh.it> (permalink)
References <AXdj4-4mN-5@gated-at.bofh.it> <AXeoO-4Ze-5@gated-at.bofh.it>
Organization Newsfeed am Wurmloch

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Jeremy Nicoll <jn.ml.dbn.25@letterboxes.org> wrote:
> On Wed, 7 Oct 2020, at 09:39, Hans wrote:

>> I have a little question. Smartctl is telling me, that my ssd drive
>> is 6Gb/sec capable, but the actual speed is only 1,5GB/sec.

> If your SATA (presumably) connection from the machine to the SSD is a
> 6 Gbps one, the maximum data transfer speed in bytes across that
> connection would be one eighth of that (as there's 8 bits per byte),
> so about 760 MBps.

> That's about half of your "1,5GBps".  That makes me wonder if your SSD
> uses two SATA channels at once - is that even possible?

Only with SAS drives. And usually only for redudancy and not for
concurrency.

I question the benchmark Hans did.

Something tells me he either used "hdparm -tT", which is known to
misrepresent the speeds on modern drives, or wrote too little data so he
was benchmarking the Kernel cache and not the drive.

S!

-- 
Sigmentation fault. Core dumped.

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Thread

Question: SSD speed Hans <hans.ullrich@loop.de> - 2020-10-07 10:50 +0200
  Re: Question: SSD speed Georgi Naplatanov <gosho@oles.biz> - 2020-10-07 11:40 +0200
  Re: Question: SSD speed Steve McIntyre <steve@einval.com> - 2020-10-07 12:00 +0200
  Re: Question: SSD speed "Jeremy Nicoll" <jn.ml.dbn.25@letterboxes.org> - 2020-10-07 12:00 +0200
    Re: Question: SSD speed Sven Hartge <sven@svenhartge.de> - 2020-10-07 12:50 +0200
      Re: Question: SSD speed Michael Stone <mstone@debian.org> - 2020-10-07 15:10 +0200
        Re: Question: SSD speed Andrei POPESCU <andreimpopescu@gmail.com> - 2020-10-08 11:00 +0200
          Re: Question: SSD speed "Thomas Schmitt" <scdbackup@gmx.net> - 2020-10-08 12:00 +0200
            [SOLVED] Re: Question: SSD speed Hans <hans.ullrich@loop.de> - 2020-10-08 12:20 +0200
            Re: Question: SSD speed Michael Stone <mstone@debian.org> - 2020-10-08 15:20 +0200
              Re: Question: SSD speed "Thomas Schmitt" <scdbackup@gmx.net> - 2020-10-08 16:00 +0200
                Re: Question: SSD speed Michael Stone <mstone@debian.org> - 2020-10-08 16:20 +0200
                Re: Question: SSD speed Stefan Monnier <monnier@iro.umontreal.ca> - 2020-10-08 17:40 +0200
                Re: Question: SSD speed Michael Stone <mstone@debian.org> - 2020-10-08 17:50 +0200
                Re: Question: SSD speed Stefan Monnier <monnier@iro.umontreal.ca> - 2020-10-08 18:00 +0200
              Re: Question: SSD speed Leslie Rhorer <lesrhorer@att.net> - 2020-10-08 20:30 +0200
                Re: Question: SSD speed Dan Ritter <dsr@randomstring.org> - 2020-10-08 20:40 +0200
                Re: Question: SSD speed Michael Stone <mstone@debian.org> - 2020-10-08 21:20 +0200
                Re: Question: SSD speed Leslie Rhorer <lesrhorer@att.net> - 2020-10-09 02:00 +0200
                Re: Question: SSD speed Michael Stone <mstone@debian.org> - 2020-10-09 02:20 +0200
                Re: Question: SSD speed Leslie Rhorer <lesrhorer@att.net> - 2020-10-09 02:40 +0200
                Re: Question: SSD speed Stefan Monnier <monnier@iro.umontreal.ca> - 2020-10-09 00:20 +0200
                Re: Question: SSD speed Leslie Rhorer <lesrhorer@att.net> - 2020-10-09 02:20 +0200
                Re: Question: SSD speed Stefan Monnier <monnier@iro.umontreal.ca> - 2020-10-09 15:50 +0200
    Re: Question: SSD speed Alberto Sentieri <22t@tripolho.com> - 2020-10-07 13:30 +0200
      Re: Question: SSD speed "Jeremy Nicoll" <jn.ml.dbn.25@letterboxes.org> - 2020-10-07 14:50 +0200
        Re: Question: SSD speed Andrei POPESCU <andreimpopescu@gmail.com> - 2020-10-08 10:50 +0200
    Re: Question: SSD speed Hans <hans.ullrich@loop.de> - 2020-10-07 18:50 +0200
      Re: Question: SSD speed "Jeremy Nicoll" <jn.ml.dbn.25@letterboxes.org> - 2020-10-07 18:50 +0200
      Re: Question: SSD speed Andy Smith <andy@strugglers.net> - 2020-10-07 19:50 +0200
        [SOLVED] Re: Question: SSD speed Hans <hans.ullrich@loop.de> - 2020-10-07 20:00 +0200
        [SOLVED] Re: Question: SSD speed Hans <hans.ullrich@loop.de> - 2020-10-08 09:10 +0200
  Re: Question: SSD speed Andrei POPESCU <andreimpopescu@gmail.com> - 2020-10-08 11:00 +0200

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