Suggestions for RAID levels

Given that we can provide redundancy @ the application level, what are
people's general preferences on RAID levels?

I'm tempted to go with either RAID0, or even use multiple path.data
locations and just mount the disks bare. Systems will likely have 6 or
8 drives etc.

Also has anybody tested performance differences between filesytem types (
xfs/ext4/?? ) and various mount options like noatime ?

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I use SAS-2 disk subsystem with ext4 and noatime. noatime makes a huge
difference, it gave me 30% more IOPS. The RAID controller has BBWC against
power outages and for faster writes (I chose RAID-5 so a node is still
active if a disk failure occurs).

Jörg

On Thursday, November 15, 2012 12:20:39 AM UTC+1, Paul C wrote:

Given that we can provide redundancy @ the application level, what are
people's general preferences on RAID levels?

I'm tempted to go with either RAID0, or even use multiple path.data
locations and just mount the disks bare. Systems will likely have 6 or
8 drives etc.

Also has anybody tested performance differences between filesytem types (
xfs/ext4/?? ) and various mount options like noatime ?

--