To bring this back to its actual application... Its a personal music server made from scrap parts. It doesn't require 5 9's uptime of hands free operation. The most likely failure mode of this thing is that one day a drive will fail on reboot/startup. Hot spare isn't going to save it from a second drive failure at startup. For its application integrity is a priority over everything else. Downtime is a relatively inconsequential cost.<div>
<br></div><div>Hot spare is good if you have an extra one available. In this case the 5 drives are of better use in RAID 6 rather than just having one sitting around. If he gets another drive at some point then its painless to add it as a hot spare. Plus I don't think saving a few minutes is worth the extra hassle since if a drive does fail he is probably going to be right there. That array will have a rebuild time of 7 hours or so. Not a big time savings. </div>
<div><br></div><div><div><div class="gmail_quote">On Sun, Oct 2, 2011 at 8:14 PM, Adam Tauno Williams <span dir="ltr"><<a href="mailto:awilliam@whitemice.org">awilliam@whitemice.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">On Fri, 2011-09-30 at 18:55 -0400, Richard Nienhuis wrote:<br>
> Performance issues are going to be inconsequential for a machine<br>
> playing music. In degraded mode there is probably still enough<br>
> performance. Also hot spare isn't going to spare you from the time to<br>
> rebuild the array.<br>
<br>
</div>???? I just can't express in words how strongly, completely,<br>
absolutely, and utterly I disagree with the statement: "Hot spare isn't<br>
<div class="im">going to spare you from the time to rebuild the array."<br>
<br>
</div>That is like saying ice is hot and water is dry.<br>
<br>
A hot spare means - Rebuilding the array actually starts!!!!<br>
<br>
The sooner it starts the sooner it is complete and the redundancy<br>
underlying the data is restored. A RAID solution without a hot spare is<br>
a sports car with only three tires.<br>
<div><div></div><div class="h5"><br>
<br>
<br>
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