Device mapper multipathing (DM-Multipath) в Red Hat Enterprise Linux Server release 6.4 (Santiago)

lspci
fdisk -l
cat /etc/multipath.conf
/sbin/mpathconf
cat /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf
multipathd -k
ll /dev/

Linux How Tos : Tutorials: Redhat Device Mapper Multipathing
yum install device-mapper-multipath
mpathconf --enable
service multipathd start
chkconfig multipathd on
multipath -ll

2.4. Multipath Devices in Logical Volumes
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4.4.1. Creating Logical Volumes

pvcreate /dev/mapper/mpathb
pvcreate /dev/mapper/mpathd
pvcreate /dev/mapper/mpathc

pvscan
pvdisplay

vgcreate vol_grp1 /dev/mapper/mpathb
vgcreate vol_grp2 /dev/mapper/mpathd
vgcreate vol_grp3 /dev/mapper/mpathc

vgdisplay

vgdisplay vol_grp1 | grep "Total PE"
lvcreate -l 127996 -n logical_vol1 vol_grp1

vgdisplay vol_grp2 | grep "Total PE"
lvcreate -l 764 -n logical_vol1 vol_grp2

vgdisplay vol_grp3 | grep "Total PE"
lvcreate -l 127996 -n logical_vol1 vol_grp3

lvdisplay

Linux how to determine the file system type
df -T

mkfs.ext4 /dev/vol_grp1/logical_vol1
mkfs.ext4 /dev/vol_grp2/logical_vol1
mkfs.ext4 /dev/vol_grp3/logical_vol1

How to mount Linux LVM volume partitions on Linux | Linuxers

pvs

lvdisplay /dev/vol_grp1

mount /dev/vol_grp1/logical_vol1 /mnt/snapshots -t ext4
mount /dev/vol_grp2/logical_vol1 /mnt/commandlog -t ext4
mount /dev/vol_grp3/logical_vol1 /mnt/commandlogsnapshot -t ext4

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nano /etc/fstab
/dev/vol_grp1/logical_vol1 /mnt/snapshots ext4 defaults 0 2
/dev/vol_grp2/logical_vol1 /mnt/commandlog ext4 defaults 0 2
/dev/vol_grp3/logical_vol1 /mnt/commandlogsnapsho ext4 defaults 0 2