<div dir="ltr"><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"><span style="font-size:10pt;font-family:Roboto">Best!</span></a></p><p class="MsoNormal" style="vertical-align:baseline"><a name="SignatureSanitizer__MailAutoSig"><span style="font-size:10pt;font-family:Roboto">Atiq</span></a></p></div></div></div></div>