软RAID+LVM实现
Author:atyu30 (iopenbsd # gmail.com)
实验环境：
/dev/sda2 2 1044 8377897+ fd Linux raid autodetect
Disk /dev/sdb: 8589 MB, 8589934592 bytes
/dev/sdb1 * 1 1044 8385898+ fd Linux raid autodetect
Disk /dev/sdc: 8589 MB, 8589934592 bytes
/dev/sdc1 * 1 1044 8385898+ fd Linux raid autodetect
目的：实现RAID5 ＋LVM
大体流程：
建RAID5->建LVM（建PV->建VG->建LV）->格式化->使用
操作步骤：
1.创建raid5
# mdadm -C /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sda2
mdadm: /dev/sdb1 appears to contain an ext2fs file system
size=16771584K mtime=Mon Apr 14 19:59:29 2008
mdadm: /dev/sdb1 appears to be part of a raid array:
level=raid0 devices=2 ctime=Mon Apr 14 19:52:42 2008
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid0 devices=2 ctime=Mon Apr 14 19:52:42 2008
Continue creating array?
Continue creating array? (y/n) y
mdadm: array /dev/md0 started.
# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Mon Apr 14 21:29:00 2008
Raid Level : raid5
Array Size : 16755584 (15.98 GiB 17.16 GB)
Device Size : 8377792 (7.99 GiB 8.58 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Apr 14 21:29:00 2008
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
Rebuild Status : 6% complete
UUID : f19189bd:d760fee1:b1a384ad:f82cd785
Events : 0.1
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
3 8 2 2 spare rebuilding /dev/sda2
2.创建lvm
2.1.创建pv
#pvcreate /dev/md0
2.2.创建vg
#vgscan
#vgcreate atyu30 /dev/md0
#vgdisplay atyu30
2.3.创建lv
#lvcreate -n data -l 125 atyu30
#lvcreate -n home -l 125 atyu30
3.格式化
#mkfs.ext3 /dev/atyu30/data
#mkfs.ext3 /dev/atyu30/home
4.使用RAID 5 + LVM
# mount /dev/atyu30/data /share/
# mount /dev/atyu30/home /home/
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