<div dir="ltr">On Tue, Jul 16, 2013 at 9:34 AM, Gary Buhrmaster <span dir="ltr"><<a href="mailto:gary.buhrmaster@gmail.com" target="_blank">gary.buhrmaster@gmail.com</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Tue, Jul 16, 2013 at 2:22 PM, Joseph Fry <<a href="mailto:joe@thefrys.com">joe@thefrys.com</a>> wrote:<br>
.....<br>
<div class="im">> There is nothing wrong with RAID 5...<br>
<br>
</div>Actually, there is something wrong with RAID 5 with today's disks.<br>
If the point of RAID 5 is ability to recover from one bad disk, there is<br>
a fair chance that during the recovery, another drive will fail (or have<br>
unreadable blocks), and your RAID reconstruction will then fail<br>
(if you have hot spare designs, there are algorithms to use both<br>
the good and bad drive(s) to reduce this exposure, but those are<br>
not common (and some may be patent encumbered)). If your goal<br>
is recovery, you need to look at RAID 6.<br>
<br>
And, as Joseph says, RAID is not a backup solution. It is for<br>
data availability. Do not confuse the two, especially if the NAS<br>
is for data you care about.<br>
<br>
If you *truly* need to care about your data (say, you are a<br>
bank with regulatory requirements), you run ZFS. However,<br>
if your goal is data availability, run RAID 6, not RAID 5.<br>
<span class="HOEnZb"><font color="#888888"><br>
Gary</font></span></blockquote><div><br></div><div>That's why I have FreeNAS. I'm running RAIDZ2 (or RAID6) on the 6x500GB disks. I also mirror the 2TB drives. FreeNAS is FreeBSD based, hence my needing ESXi for virtualization. I'm considering moving from ESXi to OmniOS with KVM. We'll see if I get around to that.</div>
<div><br></div><div>I agree on the ZFS point. It can really help to ensure your data doesn't get corrupted during normal operation (if you know how to use ZFS). I'd stay away from ZFS on Linux for a while. It's a different implementation than the Solaris and I'm not sure if it has all the bugs worked out yet.</div>
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