[ale] Centos 7 installer

[Jim Kinney]

Always fun learning new tricks.

The installer in C7 is from Fedora 19. It looked like the process to create
software raid 1 with triple mirror just didn't exist.
I was wrong :-)

I have an older supermicro 1u that has LSI sas2008 raid chip. It doesn't do
triple mirror. It does raid 1e.

The centos 7 installer "did the right thing" as I selected all drives for
use and manually created my layout.

I created a 500M /boot and selected type raid 1 and xfs filesystem. Ditto
for / and /home. Swap was it's own beast.

Once a mount point is selected, the "tools" icon allows drive selection for
the partition. The default is all drives.

I ran a fast, basic install to see what it would do. Mdstat shows I have 3
triple mirror partitions :-)  Currently, the big home one is synching (2TB
in 4 hours across 3 drives - not bad for SATA2 drives - controller supports
SAS2 but the budget didn't).

The swap was placed in an lvm that spanned equal size partitions across all
3 drives.

Nice.

Happy admin.
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