Jim's RULE of RAID: NEVER, EVER INSTALL RAID DRIVES WITH SEQUENTIAL SERIAL NUMBERS!!! <br><br>If possible, avoid RAID drive purchases from the same supplier and manufacturer. <br><br>I was bit once by a RAID5 failure. The lesson I learned is to image ALL remaining drives before replacing the failed drive. <br>
<br>Google did research on drive failure rates and recover times and found that once a drive is larger than 500GB, a RAID5 system is a bad idea. The failure rate of similar age drives (even mixed version, model, etc.) was such that the array was likely to fail a second drive before the first failure had been recovered from. RAID6 only buys a bit more time as it requires a 3 drive failure for data loss. Based on that and my own experience, RAID 10 is the only stuff I use now. When the data ABSOLUTELY must be available, I use a 3 drive mirror spread across 3 different controllers (so, yes, software raid) so typically, the mobo controller and 2 additional cards. 12 drives in 4 stripes with 3 copies of each stripe makes me happy. It's an especially good setup for write seldom, read often servers. The write speed is not sufficient for high-write-throughput database stuff so I'd incorporate some SSD hardware for WAL stuff.<br>
<br><div class="gmail_quote">On Tue, Jan 3, 2012 at 10:59 AM, Michael Trausch <span dir="ltr"><<a href="mailto:mike@trausch.us">mike@trausch.us</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Well, all I am going to say is thank goodness I'm using RAID 6 and not<br>
RAID 5, or all would have been lost for me at the start of the year.<br>
<br>
I'll write more later, I learned that the Linux kernel is also not as<br>
great in handling certain things as it could be. :-/<br>
<br>
--- Mike<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
A man who reasons deliberately, manages it better after studying Logic<br>
than he could before, if he is sincere about it and has common sense.<br>
--- Carveth Read, “Logic”<br>
<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>-- <br>James P. Kinney III<br><br>As long as the general population is passive, apathetic, diverted to
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