Re: WD Blue 510 SSD and strange write performance

mike tancsa <[email protected]> Thu, 14 Mar 2024 15:36:41 -0400
Newsgroups	gmane.os.freebsd.devel.hardware
Message-ID	<[email protected]>
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On 3/14/2024 2:56 PM, Bob Bishop wrote:
> Probably (I don’t know for sure) these drives have a RAM write cache 
> and really suck at committing from there to NVM.


ZFS doesnt seem to like it, or, possibly something else in addition 
going on.   I will start to get errors like this

(da4:mrsas0:0:23:0): READ(10). CDB: 28 00 3c 39 f2 60 00 00 08 00
(da4:mrsas0:0:23:0): CAM status: SCSI Status Error
(da4:mrsas0:0:23:0): SCSI status: OK
(da5:mrsas0:0:24:0): READ(10). CDB: 28 00 28 0b b5 38 00 00 f0 00
(da5:mrsas0:0:24:0): CAM status: SCSI Status Error
(da5:mrsas0:0:24:0): SCSI status: OK

when I have a heavy stream of zfs send | zfs recv going on.  Not sure if 
its possible to work around this or its some other bad interaction, or 
just a plain old bug in the firmware of these SSDs

     ---Mike

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    <p><br>
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    <div class="moz-cite-prefix">On 3/14/2024 2:56 PM, Bob Bishop wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email protected]"><span
      style="white-space: pre-wrap">Probably (I don’t know for sure) these drives have a RAM write cache and really suck at committing from there to NVM.</span></blockquote>
    <p><br>
    </p>
    <p>ZFS doesnt seem to like it, or, possibly something else in
      addition going on.   I will start to get errors like this<br>
    </p>
    <p>(da4:mrsas0:0:23:0): READ(10). CDB: 28 00 3c 39 f2 60 00 00 08 00
      <br>
      (da4:mrsas0:0:23:0): CAM status: SCSI Status Error<br>
      (da4:mrsas0:0:23:0): SCSI status: OK<br>
      (da5:mrsas0:0:24:0): READ(10). CDB: 28 00 28 0b b5 38 00 00 f0 00
      <br>
      (da5:mrsas0:0:24:0): CAM status: SCSI Status Error<br>
      (da5:mrsas0:0:24:0): SCSI status: OK</p>
    <p>when I have a heavy stream of zfs send | zfs recv going on.  Not
      sure if its possible to work around this or its some other bad
      interaction, or just a plain old bug in the firmware of these SSDs
      <br>
    </p>
    <p>    ---Mike<br>
    </p>
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