一、创建一个可用空间为1G的RAID1设备,文件系统为ext4,有一个空闲盘,开机可自动挂载至/backup目录
1、首先手动给虚拟机添加两块硬盘
2、添加硬盘后,无需关机,直接让内核扫描添加的磁盘
[root@centos6 ~]# echo '- - -' > /sys/class/scsi_host/host2/scan #通知内核扫描硬盘,如还是没有显示,将host2更改为0或1 [root@centos6 ~]# lsblk #查看内核是否已扫描到添加的硬盘,也可以用"fdisk -l"命令查看硬盘设备 NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom sda 8:0 0 200G 0 disk ├─sda1 8:1 0 200M 0 part /boot ├─sda2 8:2 0 97.7G 0 part / ├─sda3 8:3 0 9.8G 0 part /testdir ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 2G 0 part [SWAP] sdb 8:16 0 20G 0 disk sdc 8:32 0 20G 0 disk
3、对添加的硬盘进行分区
[root@centos6 ~]# fdisk /dev/sdb #对添加的硬盘"sdb"进行分区 WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): n #新增一个分区 Command action e extended p primary partition (1-4) p #选择为主分区 Partition number (1-4): 1 #选择主分区编号为1 First cylinder (1-2610, default 1): #直接回车键选择起始柱面的默认值为1 Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +1G #给新增的分区磁盘容量为1G Command (m for help): t #选择分区类型 Selected partition 1 Hex code (type L to list codes): fd #选择分区类型为fd Changed system type of partition 1 to fd (Linux raid autodetect) Command (m for help): w #分区完毕后,保存退出 The partition table has been altered! Calling ioctl() to re-read partition table. #未有显示报警信息,无需使用命令"partx"让内核扫描硬盘分区 Syncing disks. [root@centos6 ~]# fdisk -l /dev/sdb #查看磁盘"sdb"分区情况 Disk /dev/sdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xdf758fca Device Boot Start End Blocks Id System /dev/sdb1 1 132 1060258+ fd Linux raid autodetect #已显示分区,切显示的类型为fd,也就是"Linux raid autodetect" 对于另一块磁盘"sdc"的分区,不再做演示,按"sdb"分区的步骤操作即可
4、制作1G的RAID1设备
[root@centos6 ~]# mdadm -C /dev/md0 -a yes -l 1 -n 2 -c 512 /dev/sd{bc}1 #创建一个 1G RAID1的设备 mdadm: You haven't given enough devices (real or missing) to create this array [root@centos6 ~]# mdadm -C /dev/md0 -a yes -l 1 -n 2 -c 512 /dev/sd{b,c}1 mdadm: Note: this array has metadata at the start and #提示说软raid的不能用作启动分区 may not be suitable as a boot device. If you plan to store '/boot' on this device please ensure that your boot-loader understands md/v1.x metadata, or use --metadata=0.90 Continue creating array? Continue creating array? (y/n) y #确认创建软raid1 mdadm: Defaulting to version 1.2 metadata mdadm: array /dev/md0 started. #提示创建成功 [root@centos6 ~]# mdadm -D /dev/md0 #查看raid1的信息 /dev/md0: Version : 1.2 Creation Time : Sat Aug 6 20:27:22 2016 Raid Level : raid1 Array Size : 1059200 (1034.38 MiB 1084.62 MB) Used Dev Size : 1059200 (1034.38 MiB 1084.62 MB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Sat Aug 6 20:27:28 2016 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : centos6:0 (local to host centos6) UUID : 1dbeb9dc:e22b62df:7338c4e7:f754fcd6 Events : 17 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 [root@centos6 ~]#
5、对"md0"进行格式,并创建文件系统为ext4
[root@centos6 ~]# mkfs -t ext4 /dev/md0 #将raid0中的"md0"进行格式化文件系统为"ext4" mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 66240 inodes, 264800 blocks 13240 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=272629760 9 block groups 32768 blocks per group, 32768 fragments per group 7360 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376 Writing inode tables: done Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 22 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
6、将"md0"挂载到/backup目录下,并在配置文件中填写挂载记录,使得开机自动挂载
[root@centos6 ~]# echo -e "`blkid /dev/md0 |cut -d ' ' -f2`\t /backup\t ext4 defaults\t 0\t 0" >> /etc/fstab #将挂载信息写入到配置文件当中,建议填写UUID,重启电脑后名称会变 [root@centos6 ~]# mkdir /backup #创建要挂载目录 [root@centos6 ~]# mount -a #加载配置文件中的所有文件系统 [root@centos6 ~]# mount |grep '/dev/md0' #查看是否已挂载 /dev/md0 on /backup type ext4 (rw) [root@centos6 ~]# reboot #重启电脑 [root@centos6 ~]# mount #查看挂载的文件系统 /dev/sda2 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0") /dev/sda1 on /boot type ext4 (rw) /dev/sda3 on /testdir type ext4 (rw) /dev/md127 on /backup type ext4 (rw) #原来的名称"md0"已变成"md127" none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) [root@centos6 ~]# mdadm -D /dev/md127 #查看挂载分区 /dev/md127: Version : 1.2 Creation Time : Sat Aug 6 20:27:22 2016 Raid Level : raid1 Array Size : 1059200 (1034.38 MiB 1084.62 MB) Used Dev Size : 1059200 (1034.38 MiB 1084.62 MB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Sat Aug 6 21:20:47 2016 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : centos6:0 (local to host centos6) UUID : 1dbeb9dc:e22b62df:7338c4e7:f754fcd6 Events : 21 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 #显示为之前的两个分区创建的raid0,如需开机自动挂载,需写入配置文件/etc/fstab中 1 8 33 1 active sync /dev/sdc1
二、创建由三块硬盘组成的可用空间为2G的RAID5设备,要求其chunk大小为256k,文件系统为ext4,开机可自动挂载至/mydata目录
1、首先手动给虚拟机添加两块硬盘
2、添加硬盘后,无需关机,直接让内核扫描添加的磁盘
[root@centos6 ~]# echo '- - -' > /sys/class/scsi_host/host2/scan #通知内核扫描硬盘,如还是没有显示,将host2更改为0或1 [root@centos6 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom sda 8:0 0 200G 0 disk ├─sda1 8:1 0 200M 0 part /boot ├─sda2 8:2 0 97.7G 0 part / ├─sda3 8:3 0 9.8G 0 part /testdir ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 2G 0 part [SWAP] sdb 8:16 0 20G 0 disk sdc 8:32 0 20G 0 disk sdd 8:48 0 20G 0 disk
3、对添加的硬盘进行分区
[root@centos6 ~]# fdisk /dev/sdb #对添加的硬盘"sdb"进行分区 Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x0f25c5ba. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): n #新增一个分区 Command action e extended p primary partition (1-4) p #选择为主分区 Partition number (1-4): 1 #选择主分区编号为1 First cylinder (1-2610, default 1): #直接回车键选择起始柱面的默认值为1 Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +2G #给新增的分区磁盘容量为2G Command (m for help): t #选择分区类型 Selected partition 1 Hex code (type L to list codes): fd #选择分区类型为fd Changed system type of partition 1 to fd (Linux raid autodetect) Command (m for help): w #分区完毕后,保存退出 The partition table has been altered! Calling ioctl() to re-read partition table. #未有显示报警信息,无需使用命令"partx"让内核扫描硬盘分区 Syncing disks. [root@centos6 ~]# fdisk -l /dev/sdb #查看磁盘"sdb"分区情况 Disk /dev/sdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0f25c5ba Device Boot Start End Blocks Id System /dev/sdb1 1 262 2104483+ fd Linux raid autodetect #已显示分区,切显示的类型为fd,也就是"Linux raid autodetect" 对于另外两块磁盘"sdc"和"sdd"的分区,不再做演示,按"sdb"分区的步骤操作即可
4、制作2G的RAID5设备,且chunk大小为256k
[root@centos6 ~]# fdisk -l /dev/sd[b-d] |grep '^/dev/sd[b-d]' #查看三块磁盘分区的情况 /dev/sdb1 1 262 2104483+ fd Linux raid autodetect /dev/sdc1 1 262 2104483+ fd Linux raid autodetect /dev/sdd1 1 262 2104483+ fd Linux raid autodetect [root@centos6 ~]# mdadm -C /dev/md5 -a yes -l 5 -n 3 -c 256 /dev/sd{b,c,d}1 #创建raid5并命名为"md5",chunk大小为256 mdadm: Defaulting to version 1.2 metadata mdadm: array /dev/md5 started. [root@centos6 ~]# mdadm -D /dev/md5 #查看创建后的信息 /dev/md5: Version : 1.2 Creation Time : Sat Aug 6 23:02:18 2016 Raid Level : raid5 Array Size : 4204544 (4.01 GiB 4.31 GB) Used Dev Size : 2102272 (2.00 GiB 2.15 GB) Raid Devices : 3 Total Devices : 3 Persistence : Superblock is persistent Update Time : Sat Aug 6 23:02:29 2016 State : clean Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 256K #chunk大小为256K Name : centos6:5 (local to host centos6) UUID : 592b4f57:8c5842b2:8b2814b2:f0de1c28 Events : 18 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 3 8 49 2 active sync /dev/sdd1
5、对"md5"进行格式,并创建文件系统为ext4
[root@centos6 ~]# mkfs -t ext4 -L 'MYDATA' -m 3 -b 4096 /dev/md5 #将"md5"格式化为ext4的文件系统,卷标为"MYDATA",预留给管理员的百分比为3%,块大小为4K mke2fs 1.41.12 (17-May-2010) Filesystem label=MYDATA OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=64 blocks, Stripe width=128 blocks 262944 inodes, 1051136 blocks 31534 blocks (3.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1077936128 33 block groups 32768 blocks per group, 32768 fragments per group 7968 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 37 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
6、将"md5"挂载到/mydata目录下,并在配置文件中填写挂载记录,使得开机自动挂载
[root@centos6 ~]# echo -e "`blkid /dev/md5 | cut -d' ' -f3`\t /mydata\t ext4\t defaults\t 0 0" >> /etc/fstab ##将挂载信息写入到配置文件当中,建议填写UUID,重启电脑后名称会变 [root@centos6 ~]# tail -1 !$ #查看填写的情况 tail -1 /etc/fstab UUID="9a583c7c-4fe0-4208-a19c-9133c83b112d" /mydata ext4 defaults 0 0 [root@centos6 ~]# mkdir /mydata #创建挂目录"/mydata" [root@centos6 ~]# mount -a [root@centos6 ~]# mount |grep '/dev/md5' #查看是否已挂载 /dev/md5 on /mydata type ext4 (rw)
7、测试是否可以启动开机挂载
[root@centos6 ~]# reboot #重启电脑 [root@centos6 ~]# mount #查看挂载的文件系统 /dev/sda2 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0") /dev/sda1 on /boot type ext4 (rw) /dev/sda3 on /testdir type ext4 (rw) /dev/md127 on /mydata type ext4 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) [root@centos6 ~]# mdadm -D /dev/md127 #查看raid情况信息 /dev/md127: Version : 1.2 Creation Time : Sat Aug 6 23:02:18 2016 Raid Level : raid5 Array Size : 4204544 (4.01 GiB 4.31 GB) Used Dev Size : 2102272 (2.00 GiB 2.15 GB) Raid Devices : 3 Total Devices : 3 Persistence : Superblock is persistent Update Time : Sat Aug 6 23:20:09 2016 State : clean Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 256K Name : centos6:5 (local to host centos6) UUID : 592b4f57:8c5842b2:8b2814b2:f0de1c28 Events : 22 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 #显示为之前的三个分区创建的raid5,如需开机自动挂载,需写入配置文件/etc/fstab中 1 8 33 1 active sync /dev/sdc1 3 8 49 2 active sync /dev/sdd1
三、创建和扩展逻辑卷
1、创建pv卷(10G作为参考)
首先手动给虚拟机添加两块20G的硬盘,接下来创建pv卷
[root@centos6 ~]# echo '- - -' > /sys/class/scsi_host/host2/scan #通知内核扫描硬盘,如还是没有显示,将host2更改为0或1 [root@centos6 ~]# lsblk #查看内核是否扫描到添加的硬盘 NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom sda 8:0 0 200G 0 disk ├─sda1 8:1 0 200M 0 part /boot ├─sda2 8:2 0 97.7G 0 part / ├─sda3 8:3 0 9.8G 0 part /testdir ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 2G 0 part [SWAP] sdb 8:16 0 20G 0 disk sdc 8:32 0 20G 0 disk [root@centos6 ~]# fdisk /dev/sdb #对新增的磁盘"sdb"进行分区测试 Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x69e6c6bc. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): n #新增一个分区 Command action e extended p primary partition (1-4) p #新增的分区选择为主分区 Partition number (1-4): 1 First cylinder (1-2610, default 1): #直接回车键默认起始柱面为1 Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +10G #给新增的主分区添加容量为10G Command (m for help): t #选择分区类型 Selected partition 1 Hex code (type L to list codes): 8e #将新增的分区分为8e类型,8e类型为(Linux LVM) Changed system type of partition 1 to 8e (Linux LVM) Command (m for help): w #分区完毕,保存退出 The partition table has been altered! Calling ioctl() to re-read partition table. #未有显示报警信息,无需使用命令"partx"让内核扫描硬盘分区 Syncing disks. [root@centos6 ~]# fdisk -l /dev/sdb |tail -2 #查看分区的分区类型 Device Boot Start End Blocks Id System /dev/sdb1 1 1306 10490413+ 8e Linux LVM [root@centos6 ~]# pvcreate /dev/sdb1 #将分区"sdb1"创建为pv卷 Physical volume "/dev/sdb1" successfully created
2、创建vg卷
[root@centos6 ~]# vgcreate myvg /dev/sdb1 #创建vg卷 Volume group "myvg" successfully created
3、创建lv卷(逻辑卷)
[root@centos6 ~]# lvcreate -L 2G -n mylv myvg #创建lv卷,大小为2G,命名为mylv Logical volume "mylv" created. [root@centos6 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv myvg -wi-a----- 2.00g [root@centos6 ~]# ls -l /dev/mapper/myvg-mylv #查看逻辑卷设备名称 lrwxrwxrwx. 1 root root 7 Aug 6 21:09 /dev/mapper/myvg-mylv -> ../dm-0
4、格式化设备"myvg-mylv"为ext4文件系统
[root@centos6 ~]# mkfs -t ext4 /dev/mapper/myvg-mylv #将设备"myvg-mylv"格式化为ext4文件系统 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 131072 inodes, 524288 blocks 26214 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=536870912 16 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912 Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 22 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
5、逻辑卷的扩展与缩减
[root@centos6 ~]# mkdir /mydata #创建挂载目录"mydata" [root@centos6 ~]# mount /dev/mapper/myvg-mylv /mydata/ #将逻辑卷"myvg-mylv"挂载到目录"mydata [root@centos6 ~]# cp /etc/issue /mydata/ #复制文件到该挂载的目录下 [root@centos6 ~]# cat /mydata/issue #查看内容未有遗漏 CentOS release 6.8 (Final) Kernel \r on an \m [root@centos6 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv myvg -wi-ao---- 2.00g [root@centos6 ~]# lvextend -L 5G /dev/mapper/myvg-mylv #扩展逻辑卷"mylv"的容量到5G Size of logical volume myvg/mylv changed from 2.00 GiB (512 extents) to 5.00 GiB (1280 extents). Logical volume mylv successfully resized. [root@centos6 ~]# df -h #查看逻辑卷"mylv"的容量未有扩展到5G Filesystem Size Used Avail Use% Mounted on /dev/sda2 96G 3.5G 88G 4% / tmpfs 932M 372K 931M 1% /dev/shm /dev/sda1 190M 39M 142M 22% /boot /dev/sda3 9.5G 22M 9.0G 1% /testdir /dev/mapper/myvg-mylv 2.0G 3.1M 1.9G 1% /mydata [root@centos6 ~]# resize2fs /dev/mapper/myvg-mylv #将物理卷的容量扩展,未有指明扩展多少,因此按逻辑卷"myvg-mylv"的容量扩展到5G resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/myvg-mylv is mounted on /mydata; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/mapper/myvg-mylv to 1310720 (4k) blocks. The filesystem on /dev/mapper/myvg-mylv is now 1310720 blocks long. [root@centos6 ~]# df -h #查看逻辑卷"mylv"的容量是否有扩展到5G Filesystem Size Used Avail Use% Mounted on /dev/sda2 96G 3.5G 88G 4% / tmpfs 932M 372K 931M 1% /dev/shm /dev/sda1 190M 39M 142M 22% /boot /dev/sda3 9.5G 22M 9.0G 1% /testdir /dev/mapper/myvg-mylv 4.9G 4.0M 4.7G 1% /mydata #已显示扩展到5G [root@centos6 ~]# umount /dev/mapper/myvg-mylv #取消挂载 [root@centos6 ~]# e2fsck -f /dev/mapper/myvg-mylv #检查文件系统,并且修复 e2fsck 1.41.12 (17-May-2010) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/mapper/myvg-mylv: 12/655360 files (0.0% non-contiguous), 58672/2621440 blocks [root@centos6 ~]# resize2fs /dev/mapper/myvg-mylv 2G #缩减逻辑卷大小为2G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/myvg-mylv to 524288 (4k) blocks. The filesystem on /dev/mapper/myvg-mylv is now 524288 blocks long. [root@centos6 ~]# lvs #查看逻辑卷"myvg-mylv"信息 LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert mylv myvg -wi-a----- 5.00g #显示为5G [root@centos6 ~]# lvreduce -L 2G /dev/mapper/myvg-mylv #缩减物理卷的大小为2G WARNING: Reducing active logical volume to 2.00 GiB. THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce myvg/mylv? [y/n]: y #确认是否要缩圈,有风险(Tips:实际生产环境中不建议缩减,容易丢失数据) Size of logical volume myvg/mylv changed from 3.00 GiB (768 extents) to 2.00 GiB (512 extents). Logical volume mylv successfully resized. [root@centos6 ~]# mount /dev/mapper/myvg-mylv /mydata/ #重新挂载到"/mydata"目录下 [root@centos6 ~]# df -h #查看逻辑卷"mylv"的容量是否有缩减到2G Filesystem Size Used Avail Use% Mounted on /dev/sda2 96G 3.5G 88G 4% / tmpfs 932M 372K 931M 1% /dev/shm /dev/sda1 190M 39M 142M 22% /boot /dev/sda3 9.5G 22M 9.0G 1% /testdir /dev/mapper/myvg-mylv 2.0G 3.1M 1.9G 1% /mydata #已显示缩减到2G [root@centos6 ~]# cat /mydata/issue #查看逻辑卷myvg-mylv中的内容是否有损,查看内容属于完整性(如果数据占据的磁盘容量大于缩减的容量,数据会有损坏和丢失,建议不缩减,如要缩减, CentOS release 6.8 (Final) 尽量保持逻辑卷的容量大于数据的容量) Kernel \r on an \m
原创文章,作者:Aleen,如若转载,请注明出处:http://www.178linux.com/42066
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文章操作性较强,建议能lvm的工作原理进行一个详细的介绍。