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<div class="moz-cite-prefix">Another comment - I've been listening
to old episodes of this (and slowly, slowly catching up) podcast.
As the title implies, it's mostly about *BSD, but it does have a
lot of overlap with other nixes especially and sometimes has some
interesting tidbits in there - the kind of stuff that would come
up in CLUE and CLUE-related meetings of the past and I think some
on here could definitely relate. :)<br>
</div>
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<div class="moz-cite-prefix">This talk of ZFS reminds me of this
podcast because ZFS seems to come up a lot. At least one of the
hosts is a FreeBSD committer; I'm not sure if that includes any
ZFS-related work, but those two seem to know quite a bit about it.<br>
</div>
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<div class="moz-cite-prefix"><a class="moz-txt-link-freetext" href="https://www.bsdnow.tv/">https://www.bsdnow.tv/</a><br>
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<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">On 3/27/19 9:33 PM, Shawn Perry wrote:<br>
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<p class="MsoNormal">I’m assuming you mean me, so I’ll answer.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo1">You can add.
You should add in the same pattern that already exists to
maintain performance and redundancy. If you have a 4 disk
raid 5, you should add 4 more disks in a raid 5 config.</li>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level2 lfo1">You cannot
remove yet. 0.8x will allow removing, but only to cover
accidental adds.</li>
</ol>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo1">You can
resize up. If you replace a disk with a larger one, you can
expand the space. If you add more disks, you can use the
extra space.</li>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level2 lfo1">You cannot
shrink or remove.</li>
</ol>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo1">The data
does not need balancing unless you add disks. To rebalance,
you would need to re-copy the data. You can use send/recv to
do that. You’d need to stop things to do this. The actual
stoppage will be only the amount of time it takes you to
type “zfs rename <source> <destination>” twice.
Once to move the old out of the way, once to move the new
back to the original location.</li>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo1">Sorta. You
can split mirrors in a raid 1 or raid 10 config to drop down
to a single disk or raid 0, respectively. You cannot reshape
like md or btrfs.</li>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="border:none;padding:0in"><b>From:
</b><a href="mailto:dennisjperkins@comcast.net"
moz-do-not-send="true">Dennis J Perkins</a><br>
<b>Sent: </b>Wednesday, March 27, 2019 9:23 PM<br>
<b>To: </b><a href="mailto:clue@cluedenver.org"
moz-do-not-send="true">CLUE's mailing list</a><br>
<b>Subject: </b>[clue] btrfs vs ZFS question</p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sean, does ZFS let you do these things?</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Btrfs lets you do the following without
stopping anything:</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1. Add or remove partitions. If you remove
a partition, make sure the</p>
<p class="MsoNormal">remaining drives have enough capacity.</p>
<p class="MsoNormal">2. Resize a btrfs system.</p>
<p class="MsoNormal">3. Balance the data.</p>
<p class="MsoNormal">4. Switch between single disk, RAID 0, RAID
1, or RAID 10 configs.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Shuffling data around as a result of any of
these operatins is done in</p>
<p class="MsoNormal">the background and might take hours.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">_______________________________________________</p>
<p class="MsoNormal">clue mailing list: <a class="moz-txt-link-abbreviated" href="mailto:clue@cluedenver.org">clue@cluedenver.org</a></p>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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