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Talk:Dataset - Revision history
2026-05-03T16:32:32Z
Revision history for this page on the wiki
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migrate>Ma-F at 10:27, 6 February 2018
2018-02-06T10:27:20Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:27, 6 February 2018</td>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>what does mean those deduplication options:&nbsp;<span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">ON,&nbsp;</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">VERIFY,</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">&nbsp;SHA256,&nbsp;</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">SHA256 VERIFY ???</span></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>what does mean those deduplication options:&nbsp;<span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">ON,&nbsp;</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">VERIFY,</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">&nbsp;SHA256,&nbsp;</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">SHA256 VERIFY<ins style="font-weight: bold; text-decoration: none;">&nbsp;</ins>???</span></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;"></span><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">If you accept the mathematical claim that a secure hash like SHA256 has</span></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">only a 2\^-256 probability of producing the same output given two different</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">inputs, then it is reasonable to assume that when two blocks have the</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">same checksum, they are in fact the same block. You can trust the hash.</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">An enormous amount of the world's commerce operates on this assumption,</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">including your daily credit card transactions. However, if this makes</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">you uneasy, that's OK: ZFS provies a 'verify' option that performs</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">a full comparison of every incoming block with any alleged duplicate to</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">ensure that they really are the same, and ZFS resolves the conflict if not.</span><br/><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;">To enable this variant of dedup, just specify 'verify' instead of 'on':</span></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><span style="color: rgb(64, 64, 64); font-family: Arial, Helvetica, sans-serif; font-size: 18px;"></span>https://blogs.oracle.com/bonwick/zfs-deduplication-v2</ins></div></td></tr>
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migrate>Ma-F
https://wiki.open-e.com/default/wiki/index.php?title=Talk:Dataset&diff=10952&oldid=prev
migrate>Ma-F: Created page with "what does mean those deduplication options: <span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">ON, </span><span style="color: ..."
2018-02-06T09:45:48Z
<p>Created page with "what does mean those deduplication options: <span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">ON, </span><span style="color: ..."</p>
<p><b>New page</b></p><div>what does mean those deduplication options:&nbsp;<span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">ON,&nbsp;</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">VERIFY,</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">&nbsp;SHA256,&nbsp;</span><span style="color: rgb(0, 0, 0); font-family: undefined, sans-serif; font-size: 12.8px;">SHA256 VERIFY ???</span></div>
migrate>Ma-F