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Re: From SSD to NVME

From eben@gmx.us
Newsgroups linux.debian.user
Subject Re: From SSD to NVME
Date 2024-12-05 22:10 +0100
Message-ID <JQrgJ-dZXW-3@gated-at.bofh.it> (permalink)
References <JQ6OZ-dMP1-1@gated-at.bofh.it> <JQlkZ-dVWQ-1@gated-at.bofh.it> <JQlEl-dWiT-3@gated-at.bofh.it> <JQmqJ-dWEh-3@gated-at.bofh.it> <JQosx-dYbt-7@gated-at.bofh.it>
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On 12/5/24 13:07, Michael Stone wrote:
> On Thu, Dec 05, 2024 at 10:55:48AM -0500, eben@gmx.us wrote:
>> How do I tell how many lanes a given drive uses (preferably before purchase)?
>
> It would be buried in the technical docs. I've only seen 4x drives (but I'm
> sure there may be some cheaper drives with fewer). On the motherboard side
> it's common to see 2 lanes in some slots for the simple reason that there
> are a limited number of lanes from the CPU--most people would rather have a
> slower-connected drive than none at all.

To find out if the motherboard imposed any limitations, I checked the
manual. I found these tables, which I can't see the implications of:

M2D_32G M.2 connector
+-------------+---------+---------+---------+---------+---------+---------+
|\ Connector  | SATA3_0 | SATA3_1 | SATA3_2 | SATA3_3 | SATA3_4 | SATA3_5 |
+ \----------\+---------+---------+---------+---------+---------+---------+
| Type of SSD |   SATA_Express    |    SATA_Express   |         -         |
+-------------+---------+---------+---------+---------+---------+---------+
|  SATA SSD   |    OK   |    OK   |    OK   |    X    |    OK   |    OK   |
+-------------+---------+---------+---------+---------+---------+---------+
|             |        OK         |         OK        |         -         |
+-------------+---------+---------+---------+---------+---------+---------+
| PCIe x4 SSD |    X    |    X    |    X    |    X    |    OK   |    OK   |
+-------------+---------+---------+---------+---------+---------+---------+
|             |      OK (note)    |         X         |         -         |
+-------------+---------+---------+---------+---------+---------+---------+
| PCIe x2 SSD |    OK   |    OK   |    X    |    X    |    OK   |    OK   |
+-------------+---------+---------+---------+---------+---------+---------+
|             |        OK         |         X         |         -         |
+-------------+---------+---------+---------+---------+---------+---------+

Note: The PCIe x4 SSD runs at x2 speed.

M2A_32G M.2 connector
+-------------+---------+---------+---------+---------+---------+---------+
|\ Connector  | SATA3_0 | SATA3_1 | SATA3_2 | SATA3_3 | SATA3_4 | SATA3_5 |
+ \----------\+---------+---------+---------+---------+---------+---------+
| Type of SSD |   SATA_Express    |    SATA_Express   |         -         |
+-------------+---------+---------+---------+---------+---------+---------+
|  SATA SSD   |    no   |    OK   |    OK   |    X    |    OK   |    OK   |
+-------------+---------+---------+---------+---------+---------+---------+
|             |        OK         |         OK        |         -         |
+-------------+---------+---------+---------+---------+---------+---------+
| PCIe x4 SSD |    OK   |    OK   |    OK   |    OK   |    OK   |    OK   |
+-------------+---------+---------+---------+---------+---------+---------+
|             |        OK         |         OK        |         -         |
+-------------+---------+---------+---------+---------+---------+---------+
| PCIe x2 SSD |    OK   |    OK   |    OK   |    OK   |    OK   |    OK   |
+-------------+---------+---------+---------+---------+---------+---------+
|             |        OK         |         OK        |         -         |
+-------------+---------+---------+---------+---------+---------+---------+

Yes, the tables were in that order.  Not sure why.  In the book "OK" and "X"
were a checkmark and a times-X respectively, but they're hard to type.

In each table, the even-numbered rows were darker grey, so I guess they go
together.  It gets confusing when they try to re-use the table's structure
for (mostly) unrelated data.  I don't know why they didn't just make the
tables two columns wider and half as tall.  On a side note, what are SATA
Express ports good for?  They're narrower than standard SATA ports.

Anyhow it looks like M2A_32G is more capable in general, but there are weird
restrictions everywhere.  Also it looks like there's a way to assign what's
in the M.2 slot to another SATA port, and I need to find out how that's
done, if I should acquire another M.2 drive.

> E.g.: my motherboard has something like 4x v5 + 4x v4 + 2x v4 + 4x v3. Let's
> say I have 2 v4 drives and 1 v3 drive. If I put one v4 drive in the 4x v5
> slot, one in the 4x v4 slot, and the v3 drive in the 4x v3 slot, all the
> drives will operate at their peak efficiency. If I put a 4x v4 drive in the
> 2x v4 or 4x v3 slot, it will operate at the same lower level (half the peak
> bandwidth). Also, if I put the v3 drive in the 2x v4 slot it will only be
> able to use half of its bandwidth, because it will only run at 2x v3 (as it
> is a v3 drive). Bottom line, it's worth checking the motherboard
> documentation if you have multiple M.2 slots, but only because it costs
> nothing to do so.

Man, I need to play with some better gear. This is almost entirely academic.

>> Is one kind more long-lived than the other?
>
> Not due specifically to the interface. At the same price point you'll
> probably have similar longevity, though sata drives are moving in the
> direction of less bang for the buck because there aren't many new ones being
> developed and the sales volume is going NVMe.

Right, I've already had to go from 1T spinning-rust drives to 2T, not
because I was running out of room, but because the selection of 1T drives
was so paltry.  Generally I don't mind things being slow (I'm used to
dealing with slow computers), but money is in short supply and cool hardware
costs money.  So I'm more of a trailing-edge consumer.

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Thread

From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-02 17:50 +0100
  Re: From SSD to NVME Greg Wooledge <greg@wooledge.org> - 2024-12-02 18:00 +0100
    Re: From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-02 18:10 +0100
  Re: From SSD to NVME Bret Busby <bret@busby.net> - 2024-12-02 18:50 +0100
    Re: *****SPAM***** Re: From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-02 20:30 +0100
    Re: From SSD to NVME Andy Smith <andy@strugglers.net> - 2024-12-02 21:30 +0100
  Re: From SSD to NVME basti <mailinglist@unix-solution.de> - 2024-12-02 19:40 +0100
    Re: From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-02 20:20 +0100
      Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 00:20 +0100
        Re: From SSD to NVME eben@gmx.us - 2024-12-05 15:50 +0100
          Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 16:10 +0100
            Re: From SSD to NVME eben@gmx.us - 2024-12-05 17:00 +0100
              Re: From SSD to NVME Stefan Monnier <monnier@iro.umontreal.ca> - 2024-12-05 17:20 +0100
                Re: From SSD to NVME Dan Ritter <dsr@randomstring.org> - 2024-12-05 18:00 +0100
                Re: From SSD to NVME Stefan Monnier <monnier@iro.umontreal.ca> - 2024-12-05 18:20 +0100
                Re: From SSD to NVME Chris Green <cl@isbd.net> - 2024-12-05 18:50 +0100
                Re: From SSD to NVME Stefan Monnier <monnier@iro.umontreal.ca> - 2024-12-05 20:50 +0100
                Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 21:00 +0100
                Re: From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-05 20:30 +0100
                MBR to GPT + UEFI (was: From SSD to NVME) Jeffrey Walton <noloader@gmail.com> - 2024-12-05 20:40 +0100
                Re: From SSD to NVME "Andrew M.A. Cater" <amacater@einval.com> - 2024-12-05 21:10 +0100
                Re: From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-05 21:30 +0100
                Re: From SSD to NVME David Wright <deblis@lionunicorn.co.uk> - 2024-12-05 22:20 +0100
                Re: From SSD to NVME "Andrew M.A. Cater" <amacater@einval.com> - 2024-12-05 23:10 +0100
                Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 23:40 +0100
                Re: From SSD to NVME Charles Curley <charlescurley@charlescurley.com> - 2024-12-05 23:40 +0100
                Re: From SSD to NVME "Andrew M.A. Cater" <amacater@einval.com> - 2024-12-06 19:20 +0100
                Re: From SSD to NVME Charles Curley <charlescurley@charlescurley.com> - 2024-12-06 20:00 +0100
                Re: From SSD to NVME David Wright <deblis@lionunicorn.co.uk> - 2024-12-06 01:50 +0100
                Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 21:20 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-05 22:20 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-05 22:30 +0100
                Re: From SSD to NVME Nicolas George <george@nsup.org> - 2024-12-05 22:30 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-05 22:40 +0100
                Re: From SSD to NVME Nicolas George <george@nsup.org> - 2024-12-05 23:10 +0100
                Re: From SSD to NVME David Wright <deblis@lionunicorn.co.uk> - 2024-12-05 22:20 +0100
              Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 19:10 +0100
                Re: From SSD to NVME eben@gmx.us - 2024-12-05 22:10 +0100
                Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 23:30 +0100
                Re: From SSD to NVME eben@gmx.us - 2024-12-06 00:10 +0100
                Re: From SSD to NVME Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-12-11 09:00 +0100
                Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-11 14:20 +0100
                Re: From SSD to NVME Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-12-12 22:20 +0100
                Re: From SSD to NVME Dan Ritter <dsr@randomstring.org> - 2024-12-11 14:30 +0100
                Re: From SSD to NVME Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-12-12 20:20 +0100
  Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-02 19:50 +0100
  Re: From SSD to NVME Bruno Schneider <boschneider@gmail.com> - 2024-12-02 19:50 +0100
    Re: From SSD to NVME Erwan David <erwan@rail.eu.org> - 2024-12-02 20:20 +0100
      Re: From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-02 20:30 +0100
        Re: From SSD to NVME Andy Smith <andy@strugglers.net> - 2024-12-02 21:20 +0100
          Re: From SSD to NVME Hans <hans.ullrich@loop.de> - 2024-12-02 21:50 +0100
            Re: From SSD to NVME Andy Smith <andy@strugglers.net> - 2024-12-02 22:30 +0100
              Re: From SSD to NVME <tomas@tuxteam.de> - 2024-12-03 06:40 +0100
        Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-02 21:40 +0100
    Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 16:50 +0100
      Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-05 18:30 +0100
        Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 19:20 +0100
          Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-05 20:20 +0100
            Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 21:00 +0100
              Re: From SSD to NVME Felix Miata <mrmazda@earthlink.net> - 2024-12-05 22:20 +0100
                Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 23:00 +0100
                Re: From SSD to NVME - oops! Felix Miata <mrmazda@stanis.net> - 2024-12-06 00:00 +0100
                Re: From SSD to NVME - oops! Max Nikulin <manikulin@gmail.com> - 2024-12-06 04:40 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-06 00:00 +0100
                Re: From SSD to NVME Jeffrey Walton <noloader@gmail.com> - 2024-12-06 04:20 +0100
  Re: From SSD to NVME "Andrew M.A. Cater" <amacater@einval.com> - 2024-12-02 20:50 +0100
    Re: From SSD to NVME pocket@homemail.com - 2024-12-03 03:00 +0100
      Re: From SSD to NVME "Andrew M.A. Cater" <amacater@einval.com> - 2024-12-03 10:00 +0100
        Re: From SSD to NVME pocket@homemail.com - 2024-12-03 12:10 +0100
          Re: From SSD to NVME <tomas@tuxteam.de> - 2024-12-03 12:40 +0100
          Re: From SSD to NVME Greg Wooledge <greg@wooledge.org> - 2024-12-03 13:20 +0100
            Re: From SSD to NVME pocket@homemail.com - 2024-12-03 13:40 +0100
              Re: From SSD to NVME Nicolas George <george@nsup.org> - 2024-12-03 14:00 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 14:10 +0100
                Re: From SSD to NVME Nicolas George <george@nsup.org> - 2024-12-03 14:30 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 15:30 +0100
                Re: From SSD to NVME Nicolas George <george@nsup.org> - 2024-12-03 16:00 +0100
            Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-03 15:50 +0100
              Re: From SSD to NVME Greg Wooledge <greg@wooledge.org> - 2024-12-03 20:40 +0100
                Re: From SSD to NVME Andy Smith <andy@strugglers.net> - 2024-12-03 20:50 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-03 21:40 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 22:20 +0100
                Re: From SSD to NVME Greg Wooledge <greg@wooledge.org> - 2024-12-03 22:30 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 23:00 +0100
                Re: From SSD to NVME Greg Wooledge <greg@wooledge.org> - 2024-12-03 23:10 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 23:20 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-03 22:40 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 23:00 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-03 23:20 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 23:30 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-03 23:50 +0100
                Re: From SSD to NVME Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2024-12-04 02:40 +0100
                Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-04 05:20 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-04 13:10 +0100
                Re: From SSD to NVME Joe <joe@jretrading.com> - 2024-12-04 16:00 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-04 19:00 +0100
                Re: From SSD to NVME Jeffrey Walton <noloader@gmail.com> - 2024-12-04 07:20 +0100
                Re: From SSD to NVME gene heskett <gheskett@shentel.net> - 2024-12-05 01:10 +0100
                Re: From SSD to NVME Greg Wooledge <greg@wooledge.org> - 2024-12-05 01:40 +0100
                Re: From SSD to NVME gene heskett <gheskett@shentel.net> - 2024-12-05 03:00 +0100
          Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-03 15:30 +0100
            Re: From SSD to NVME pocket@homemail.com - 2024-12-03 15:50 +0100
              Re: From SSD to NVME Felix Miata <mrmazda@stanis.net> - 2024-12-03 16:10 +0100
                Re: From SSD to NVME pocket@homemail.com - 2024-12-03 16:30 +0100
                Re: From SSD to NVME Michael Stone <mstone@debian.org> - 2024-12-05 00:00 +0100
          Re: From SSD to NVME Steve McIntyre <steve@einval.com> - 2024-12-03 22:20 +0100
  Re: From SSD to NVME Max Nikulin <manikulin@gmail.com> - 2024-12-03 04:10 +0100
  Re: From SSD to NVME David Christensen <dpchrist@holgerdanske.com> - 2024-12-03 05:50 +0100

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