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Re: RAID5 gets a bad rap

Bill Davidsen wrote:
Gordon Messmer wrote:
Your assertion ignores the fact that filesystems themselves are, in fact, databases. Real-world experience with many production systems and many workloads has convinced me to use RAID 5 as rarely as possible. Even when I'm forced to use it, I generally choose a RAID 5+0 configuration as I get much better performance.

Or you might want to read the man pages for md and mdadm. RAID10 is faster (assuming you use the "far 2" config). No, RAID10 is not another name for RAID1+0...

When I read the man page for "md", I see:

       RAID10  provides  a combination of RAID1 and RAID0, and is
       sometimes known as RAID1+0.

...so I'm not sure what man page you've been reading.

I know that RAID 10 is faster than RAID 5+0. I meant that in the rare circumstance when I'm trying to build a very large volume of disks (say, 20), I'll usually create four RAID5 arrays with five disks each, and then stripe them. The resulting array (RAID 5+0) will be more resilient to failure and perform much better than a single RAID5 array containing all 20 disks.

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