Linux 入门 5 LVM的使用
浏览数：27 /
时间：2015年06月20日
添加一块新SATA磁盘4G linux-0k5g:~ # fdisk -l Disk /dev/sda: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk 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 Linux Disk /dev/sdb: 4294 MB, 4294967296 bytes 255 heads, 63 sectors/track, 522 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000000 Disk /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 created linux-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_srsy linux-0k5g:~ # lvm lvcreate -l 96 -n lv2_srsy vg_srsy linux-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/lvmlv1 linux-0k5g:~ # mount /dev/vg_srsy/lv1_srsy /mnt/lvmlv1 linux-0k5g:~ # df Filesystem 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 -l Disk /dev/sda: 8589 MB, 8589934592 bytes 255 heads, 63 sectors/track, 1044 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk 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 Linux Disk /dev/sdb: 4294 MB, 4294967296 bytes 255 heads, 63 sectors/track, 522 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk 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 Linux Disk /dev/dm-0: 1610 MB, 1610612736 bytes 255 heads, 63 sectors/track, 195 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000000 Disk /dev/dm-0 doesn‘t contain a valid partition table # 这个是啥意思？ Disk /dev/dm-1: 1610 MB, 1610612736 bytes 255 heads, 63 sectors/track, 195 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000000 Disk /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。。。。。。
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