Here’s a nice recipe for a RAID10 array comprised of 4x SSD disks. Tested to work on CentOS 6 (RHEL 6). Be sure to add the discard option in fstab for Trim support.
zerombr yes
bootloader --location=partition --driveorder=sda,sdb,sdc,sdd
clearpart --all --initlabel --drives=sda,sdb,sdc,sdd
part raid.100000 --size=250 --ondisk=sda
part raid.100001 --size=250 --ondisk=sdb
part raid.100002 --size=250 --ondisk=sdc
part raid.100003 --size=250 --ondisk=sdd
part raid.100007 --size=1 --grow --ondisk=sdd
part raid.100006 --size=1 --grow --ondisk=sdc
part raid.100005 --size=1 --grow --ondisk=sdb
part raid.100004 --size=1 --grow --ondisk=sda
raid /boot --fstype ext3 --level=RAID1 --device=md0 raid.100000 raid.100001 raid.100002 raid.100003
raid pv.100008 --fstype "physical volume (LVM)" --level=RAID10 --device=md1 raid.100004 raid.100005 raid.100006 raid.100007
volgroup vg --pesize=65536 pv.100008
logvol swap --fstype swap --name=SystemSwap --vgname=vg --size=4096
logvol / --fstype ext4 --name=SystemRoot --vgname=vg --size=1 --grow
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