Date: Thu, 14 Mar 2024 15:36:41 -0400 From: mike tancsa <mike@sentex.net> To: Bob Bishop <rb@gid.co.uk> Cc: "freebsd-hardware@freebsd.org" <freebsd-hardware@FreeBSD.org> Subject: Re: WD Blue 510 SSD and strange write performance Message-ID: <6504bd49-eca5-4e0a-b2bd-23d29405bb7a@sentex.net> In-Reply-To: <CCAB653B-4DC6-4C69-AB68-CD258200D22F@gid.co.uk> References: <e5c2a99d-931e-48b4-9445-fc4ad05ccc70@sentex.net> <CCAB653B-4DC6-4C69-AB68-CD258200D22F@gid.co.uk>
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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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<div class="moz-cite-prefix">On 3/14/2024 2:56 PM, Bob Bishop wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CCAB653B-4DC6-4C69-AB68-CD258200D22F@gid.co.uk"><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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