Date: Sun, 10 Dec 2023 09:45:37 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: Re: periodic trim for ufs2 ssds Message-ID: <a0c78fbd-1b6b-4be4-91a0-f5a9f89e8bcf@denninger.net> In-Reply-To: <ZXXB_VJhTotewB0Z@int21h> References: <CE945AE7-3C20-46BE-A7BE-A9FB2C00746A.ref@yahoo.com> <CE945AE7-3C20-46BE-A7BE-A9FB2C00746A@yahoo.com> <ZXXB_VJhTotewB0Z@int21h>
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On 12/10/2023 08:49, void wrote:
> On Fri, Dec 08, 2023 at 06:19:51PM -0800, Mark Millard wrote:
>
>> One can sometimes use:
>>
>> # gstat -spod
>>
>> for monitoring alternatives and get an idea if on-the-fly
>> trim is rate limiting activity compared to not having it
>> enabled.
>
> thanks.
> Consumer-grade ssds seem to have sometimes a catastrophic mode of
> failure where the ssd cannot even be read, by anything.
> I hope that trim might, in the long run, help with delaying that.
> From what I've read so far, trim is considered non-harmful.
>
> On systems with enterprise-grade ssds in a zpool, I have
> (manual, zpool) trim running as a cron job a few minutes before other
> automatic jobs with heavy I/O. The trim job takes about 3 minutes to run.
> The SSDs are pci not m.2. Hopefully this extends their life to the
> maximum
> possible extent (together with weekly zpool scrub)
>
Most-common reason for that ("death") in consumer drives is unsolicited
power failures that result in the internal mapping table getting
smashed. There's not much the drive can do about that -- so buy ones
that don't have that sort of issue (Micron makes some pretty good ones
at reasonable prices.)
I'm using a decent number of the Micron 5400 series units at present and
have yet to see any indication of trouble on them, nor any abnormal
reported wear. In fact a couple of them in a mirror on a fairly busy
server where they're serving boot/swap/postfix mail spool, compile and
similar -- they are still showing, after a full year's use, 100% of wear
available.
--
Karl Denninger
karl@denninger.net
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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<div class="moz-cite-prefix">On 12/10/2023 08:49, void wrote:<br>
</div>
<blockquote type="cite" cite="mid:ZXXB_VJhTotewB0Z@int21h">On Fri,
Dec 08, 2023 at 06:19:51PM -0800, Mark Millard wrote:
<br>
<br>
<blockquote type="cite">One can sometimes use:
<br>
<br>
# gstat -spod
<br>
<br>
for monitoring alternatives and get an idea if on-the-fly
<br>
trim is rate limiting activity compared to not having it
<br>
enabled.
<br>
</blockquote>
<br>
thanks. <br>
Consumer-grade ssds seem to have sometimes a catastrophic mode of
failure where the ssd cannot even be read, by anything.
<br>
I hope that trim might, in the long run, help with delaying that.
<br>
From what I've read so far, trim is considered non-harmful.
<br>
<br>
On systems with enterprise-grade ssds in a zpool, I have
<br>
(manual, zpool) trim running as a cron job a few minutes before
other automatic jobs with heavy I/O. The trim job takes about 3
minutes to run.
<br>
The SSDs are pci not m.2. Hopefully this extends their life to the
maximum
<br>
possible extent (together with weekly zpool scrub)
<br>
<br>
</blockquote>
<p>Most-common reason for that ("death") in consumer drives is
unsolicited power failures that result in the internal mapping
table getting smashed. There's not much the drive can do about
that -- so buy ones that don't have that sort of issue (Micron
makes some pretty good ones at reasonable prices.)</p>
<p>I'm using a decent number of the Micron 5400 series units at
present and have yet to see any indication of trouble on them, nor
any abnormal reported wear. In fact a couple of them in a mirror
on a fairly busy server where they're serving boot/swap/postfix
mail spool, compile and similar -- they are still showing, after a
full year's use, 100% of wear available.<br>
</p>
<div class="moz-signature">-- <br>
Karl Denninger<br>
<a href="mailto:karl@denninger.net" class="moz-txt-link-freetext">karl@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size="-2"><i>[S/MIME encrypted email preferred]</i></font></div>
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