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<div class="moz-cite-prefix">On 11/4/25 05:03, Atiq Rahman wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABC65rNDuixz6r_i09KPhpVaoKykmD_qe9u6yTejQZamSTo-TQ@mail.gmail.com">
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<div>Hi,<br>
</div>
<div>When I am copying over files to the zfs dataset on an
external HDD, the speed is one third of what it is over exFAT.
This is zfs to zfs copy which is basically way slower than zfs
to exFAT.<br clear="all">
</div>
<div><br>
</div>
<div>This was my zpool create command on the external drive,</div>
<div><br>
</div>
<div>```</div>
<div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-sql"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m">zpool
create -o ashift=12 -O compression=lz4 -o autotrim=off
-O mountpoint=none -O atime=off -O dnodesize=auto
hyperspace /dev/dsk/c4t0d0</span></code></div>
</div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-sql"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m">```</span></code></div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-sql"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m"><br>
</span></code></div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-sql"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m"><span
style="font-family:Arial,Helvetica,sans-serif">And, this
is how the dataset was created:</span></span></code></div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-sql"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m"><br>
</span></code></div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-sql"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m">```</span></code></div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-sql"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m">
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-javascript"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m">zfs
create -o recordsize=1M -o normalization=formD -O
mountpoint=/media hyperspace/media</span></code></div>
<div><code
class="gmail-listtype-code gmail-listindent1 gmail-list-code1 gmail-lang-javascript"><span
class="gmail-author-d-1gg9uz65z1iz85zgdz68zmqkz84zo2qovvz79zvrz83ztoxeg9z71zxaez67zz79zxz83zz69zj4z83zvmz76zz69zz69zz78z1m">```</span></code></div>
</span></code></div>
<div><br>
</div>
<div>I know zfs has journaling overhead. But, is it possible to
set certain zfs properties to improve the transfer speed?</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">
<p class="MsoNormal" style="vertical-align:baseline"><a
name="SignatureSanitizer__MailAutoSig"
moz-do-not-send="true"><span
style="font-size:10pt;font-family:Roboto">Best!</span></a></p>
<p class="MsoNormal" style="vertical-align:baseline"><a
name="SignatureSanitizer__MailAutoSig"
moz-do-not-send="true"><span
style="font-size:10pt;font-family:Roboto">Atiq</span></a></p>
</div>
</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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</pre>
</blockquote>
<p>Hello Atiq!</p>
<p>How do you copy, please show the commands (?)</p>
<p>You may want to investigate the read speed with something like
zfs send ... > /dev/null</p>
<p>If you do a zfs send -> receive, a buffer like "mbuffer" may
help, over network pathes in combination with a compression
pbzip2, pigz ...</p>
<p><br>
</p>
<p>Regards,</p>
<p>Stephan</p>
<p><br>
</p>
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