Chris's Wiki :: blog/tech/SoftwareRAIDAndRAIDWriteHole Commentshttps://utcc.utoronto.ca/~cks/space/blog/tech/SoftwareRAIDAndRAIDWriteHole?atomcommentsDWiki2013-04-24T20:16:59ZRecent comments in Chris's Wiki :: blog/tech/SoftwareRAIDAndRAIDWriteHole.By Chris Siebenmann on /blog/tech/SoftwareRAIDAndRAIDWriteHoletag:CSpace:blog/tech/SoftwareRAIDAndRAIDWriteHole:b6bfe431f1464c08d56218b360dd2d00fd144ef5Chris Siebenmann<div class="wikitext"><p>My view is that there are plenty of ways to get silent data corruption
with modern drives; all of those ways are exactly why ZFS and other
modern filesystems have added checksums. The RAID-5 write hole is in
practice probably less likely to affect you than the other options,
assuming that your power and UPSes and so on are reliable (which they
are here).</p>
</div>2013-04-24T20:16:59ZFrom 86.148.19.117 on /blog/tech/SoftwareRAIDAndRAIDWriteHoletag:CSpace:blog/tech/SoftwareRAIDAndRAIDWriteHole:e5a1c2b8973cfa0fbb115f0ed79a300f391613d9From 86.148.19.117<div class="wikitext"><p>The problem with R5 write hole is that when it happens you can end up with a <em>silent</em> data corruption.</p>
<p>Additionally, ZFS RAID-Z[123] do not have write hole issue and are safe to use.</p>
</div>2013-04-23T08:24:00ZFrom 203.97.214.3 on /blog/tech/SoftwareRAIDAndRAIDWriteHoletag:CSpace:blog/tech/SoftwareRAIDAndRAIDWriteHole:4bcea6f6000d9a72a0d04395d52420c3a6fa070eFrom 203.97.214.3<div class="wikitext"><p>For me the biggest risk with hardware RAID in small to medium sized shops is the worry that if the controller fails, I won't be able to replace it easily with something that understands the on-disk format of the RAID drives, or that there will be a delay in doing so. Software RAID will, on the other hand, work the same way anywhere I can run the operating system.</p>
<p>Rodger</p>
</div>2013-04-14T00:18:27Z