添加一块新SATA磁盘4Glinux-0k5g:~ # fdisk -lDisk /dev/sda: 8589 MB, 8589934592 bytes255 heads, 63 sectors/track, 1044 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk identifier: 0x0002ba94   Device Boot      Start         End      Blocks   Id  System/dev/sda1               1         194     1558273+  82  Linux swap / Solaris/dev/sda2   *         195         847     5245222+  83  Linux/dev/sda3             848        1044     1582402+  83  LinuxDisk /dev/sdb: 4294 MB, 4294967296 bytes255 heads, 63 sectors/track, 522 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk identifier: 0x00000000Disk /dev/sdb doesn‘t contain a valid partition table分区完后   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1         125     1004031   83  Linux/dev/sdb2             126         250     1004062+  83  Linux/dev/sdb3             251         522     2184840    5  Extended/dev/sdb5             251         313      506016   83  Linux/dev/sdb6             314         376      506016   83  Linux/dev/sdb7             377         522     1172713+  83  Linux创建PV（漏掉了修改分区id为8e）linux-0k5g:~ # lvm pvcreate /dev/sdb{2,5,6,7}  Physical volume "/dev/sdb2" successfully created  Physical volume "/dev/sdb5" successfully created  Physical volume "/dev/sdb6" successfully created  Physical volume "/dev/sdb7" successfully createdlinux-0k5g:~ # lvm pvscan  PV /dev/sdb2         lvm2 [980.53 MB]  PV /dev/sdb5         lvm2 [494.16 MB]  PV /dev/sdb6         lvm2 [494.16 MB]  PV /dev/sdb7         lvm2 [1.12 GB]  Total: 4 [3.04 GB] / in use: 0 [0   ] / in no VG: 4 [3.04 GB]创建VG  linux-0k5g:~ # lvm vgcreate -s 16M vg_srsy /dev/sdb{2,5,6,7}  Volume group "vg_srsy" successfully created  linux-0k5g:~ # lvm pvscan  PV /dev/sdb2   VG vg_srsy   lvm2 [976.00 MB / 976.00 MB free]		# 容量变小了，因为每个PV里都添加了VGDA信息  PV /dev/sdb5   VG vg_srsy   lvm2 [480.00 MB / 480.00 MB free]  PV /dev/sdb6   VG vg_srsy   lvm2 [480.00 MB / 480.00 MB free]  PV /dev/sdb7   VG vg_srsy   lvm2 [1.11 GB / 1.11 GB free]  Total: 4 [3.00 GB] / in use: 4 [3.00 GB] / in no VG: 0 [0   ]  linux-0k5g:~ # lvm vgdisplay  --- Volume group ---  VG Name               vg_srsy  System ID               Format                lvm2  Metadata Areas        4  Metadata Sequence No  1  VG Access             read/write  VG Status             resizable  MAX LV                0  Cur LV                0  Open LV               0  Max PV                0  Cur PV                4  Act PV                4  VG Size               3.00 GB  PE Size               16.00 MB  Total PE              192				# 共192个PE  Alloc PE / Size       0 / 0     Free  PE / Size       192 / 3.00 GB  VG UUID               Mbl8Ki-mP2W-qZkB-5EBe-kT2k-tyFD-5Lpdi1现在在逻辑上创建了一块“大磁盘”了，下面对“大磁盘"进行”分区“，即创建两个LV
linux-0k5g:~ # lvm lvcreate -l 96 -n lv1_srsy vg_srsylinux-0k5g:~ # lvm lvcreate -l 96 -n lv2_srsy vg_srsylinux-0k5g:~ # lvm lvscan （或lvdisplay）  ACTIVE            ‘/dev/vg_srsy/lv1_srsy‘ [1.50 GB] inherit	# 注意LV全名是这个哦  ACTIVE            ‘/dev/vg_srsy/lv2_srsy‘ [1.50 GB] inherit对lv1创建文件系统（格式化）
linux-0k5g:~ # mkfs.ext3 /dev/vg_srsy/lv1_srsy挂载linux-0k5g:~ # mkdir /mnt/lvmlv1linux-0k5g:~ # mount /dev/vg_srsy/lv1_srsy /mnt/lvmlv1linux-0k5g:~ # dfFilesystem           1K-blocks      Used Available Use% Mounted on/dev/sda2              5162828   2414952   2485616  50% /udev                    387404       132    387272   1% /dev/dev/sda3              1557496    247504   1230872  17% /home/dev/mapper/vg_srsy-lv1_srsy		# 逻辑卷的位置在这里！！！                       1548144     35112   1434392   3% /mnt/lvmlv1查看分区情况linux-0k5g:/dev # fdisk -lDisk /dev/sda: 8589 MB, 8589934592 bytes255 heads, 63 sectors/track, 1044 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk identifier: 0x0002ba94   Device Boot      Start         End      Blocks   Id  System/dev/sda1               1         194     1558273+  82  Linux swap / Solaris/dev/sda2   *         195         847     5245222+  83  Linux/dev/sda3             848        1044     1582402+  83  LinuxDisk /dev/sdb: 4294 MB, 4294967296 bytes255 heads, 63 sectors/track, 522 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk identifier: 0xb9091808   Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1         125     1004031   83  Linux/dev/sdb2             126         250     1004062+  83  Linux/dev/sdb3             251         522     2184840    5  Extended/dev/sdb5             251         313      506016   83  Linux/dev/sdb6             314         376      506016   83  Linux/dev/sdb7             377         522     1172713+  83  LinuxDisk /dev/dm-0: 1610 MB, 1610612736 bytes255 heads, 63 sectors/track, 195 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk identifier: 0x00000000Disk /dev/dm-0 doesn‘t contain a valid partition table　　　　# 这个是啥意思？ Disk /dev/dm-1: 1610 MB, 1610612736 bytes255 heads, 63 sectors/track, 195 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk identifier: 0x00000000Disk /dev/dm-1 doesn‘t contain a valid partition table				   # 用lvm lvdisplay 查看 发现两个lv 是block device 253:0 和 block device 253:1
dev/mapper/vg_srsy-lv1_srsy 和 vg_srsy-lv2_srsy 用ls -al 查看也分别是 253:0 253：1，另外dm-0和dm-1也是
brw-r----- 1 root disk 253,0 Jul 12 11:56 dm-0
brw-r----- 1 root disk 253,1 Ju1 12 11:57 dm-1
这块不太懂。。。。。。