Ubuntu下创建XFS文件系统的LVM

以前在linux下面玩lvm，一般都是选择ext3、ext4格式的文件系统，最近在ubuntu 16.04.5下安装配置一个mysql数据库服务器，遂测试了一下xfs文件系统的lvm，其实仔细对比下来，差别不大，只是文件格式化的区别以及件系统的调整命令的不同。下面很多地方不做过多解释，只是简单的记录测试过程。

 

 

在测试服务器新增一个磁盘，如下所示，新增的磁盘为/dec/sdc

 

root@mylnx12:~# fdisk -l

disk /dev/sdb: 605 gib, 649613803520 bytes, 1268776960 sectors

units: sectors of 1 * 512 = 512 bytes

sector size (logical/physical): 512 bytes / 512 bytes

i/o size (minimum/optimal): 512 bytes / 512 bytes

disklabel type: dos

disk identifier: 0x2c2c38b3

device     boot start        end    sectors  size id type

/dev/sdb1        2048 1268774911 1268772864  605g  7 hpfs/ntfs/exfat

disk /dev/sda: 30 gib, 32212254720 bytes, 62914560 sectors

units: sectors of 1 * 512 = 512 bytes

sector size (logical/physical): 512 bytes / 512 bytes

i/o size (minimum/optimal): 512 bytes / 512 bytes

disklabel type: dos

disk identifier: 0x6e2369f9

device     boot start      end  sectors size id type

/dev/sda1  *     2048 62914526 62912479  30g 83 linux

disk /dev/sdc: 1023 gib, 1098437885952 bytes, 2145386496 sectors

units: sectors of 1 * 512 = 512 bytes

sector size (logical/physical): 512 bytes / 512 bytes

i/o size (minimum/optimal): 512 bytes / 512 bytes

disklabel type: dos

disk identifier: 0x030b81c8

device     boot start        end    sectors  size id type

/dev/sdc1        2048 2145386495 2145384448 1023g 83 linux

#创建pv

root@mylnx12:~#  pvcreate /dev/sdc1

  physical volume "/dev/sdc1" successfully created

root@mylnx12:~# pvscan

  pv /dev/sdc1                      lvm2 [1023.00 gib]

  total: 1 [1023.00 gib] / in use: 0 [0   ] / in no vg: 1 [1023.00 gib]

#创建vg

root@mylnx12:~# vgcreate -s 32m volgroup01 /dev/sdc1

  volume group "volgroup01" successfully created

#新增lv

root@mylnx12:~# lvcreate -l +400g -n logvol00 volgroup01

warning: xfs signature detected on /dev/volgroup01/logvol00 at offset 0. wipe it? [y/n]: y

  wiping xfs signature on /dev/volgroup01/logvol00.

  logical volume "logvol00" created.

root@mylnx12:~# lvscan

  active            '/dev/volgroup01/logvol00' [400.00 gib] inherit

#格式化

root@mylnx12:~# mkfs.xfs  /dev/volgroup01/logvol00

meta-data=/dev/volgroup01/logvol00 isize=512    agcount=4, agsize=26214400 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=1        finobt=1, sparse=0

data     =                       bsize=4096   blocks=104857600, imaxpct=25

         =                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=1

log      =internal log           bsize=4096   blocks=51200, version=2

         =                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

#挂载点设置

root@mylnx12:~# mkdir /mysql_data

root@mylnx12:~# mount -t xfs /dev/volgroup01/logvol00  /mysql_data

root@mylnx12:~# vgdisplay

  --- volume group ---

  vg name               volgroup01

  system id             

  format                lvm2

  metadata areas        1

  metadata sequence no  2

  vg access             read/write

  vg status             resizable

  max lv                0

  cur lv                1

  open lv               0

  max pv                0

  cur pv                1

  act pv                1

  vg size               1022.97 gib

  pe size               32.00 mib

  total pe              32735

  alloc pe / size       12800 / 400.00 gib

  free  pe / size       19935 / 622.97 gib

  vg uuid               8kutic-bjid-rnwk-ucho-tu2l-xkwa-idbxcj

#创建另外一个lv

root@mylnx12:~# lvcreate -l 19935 -n logvol01 volgroup01

  logical volume "logvol01" created.

root@mylnx12:~# mkfs.xfs  /dev/volgroup01/logvol01

meta-data=/dev/volgroup01/logvol01 isize=512    agcount=4, agsize=40826880 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=1        finobt=1, sparse=0

data     =                       bsize=4096   blocks=163307520, imaxpct=25

         =                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=1

log      =internal log           bsize=4096   blocks=79740, version=2

         =                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

root@mylnx12:~# mkdir /mysql_backup

root@mylnx12:~# mount -t xfs /dev/volgroup01/logvol01  /mysql_backup/

root@mylnx12:~# df -h

filesystem                       size  used avail use% mounted on

udev                             6.9g     0  6.9g   0% /dev

tmpfs                            1.4g  8.6m  1.4g   1% /run

/dev/sda1                         30g  2.1g   27g   8% /

tmpfs                            6.9g     0  6.9g   0% /dev/shm

tmpfs                            5.0m     0  5.0m   0% /run/lock

tmpfs                            6.9g     0  6.9g   0% /sys/fs/cgroup

/dev/sdb1                        596g   70m  566g   1% /mnt

tmpfs                            1.4g     0  1.4g   0% /run/user/1000

/dev/mapper/volgroup01-logvol00  400g  441m  400g   1% /mysql_data

/dev/mapper/volgroup01-logvol01  623g  668m  623g   1% /mysql_backup

 

修改配置文件/etc/fstab,在其增加下面配置信息，如下所示，以便永久保存，确保下次开机启动不丢失相关挂载点信息。

 

uuid="a72bd3f8-eb2d-40cb-92c3-d5e32c30d5ff"   /mysql_data   xfs  defaults 0 2

uuid="33325d87-f3f4-4215-abf7-ee795724697e"   /mysql_backup xfs  defaults 0 2

 

另外，ext2/ext3/ext4文件系统的调整命令是resize2fs（增大和减小都支持），而xfs文件系统的调整命令是xfs_growfs（只支持增大），当然硬要减小的话，只能在减小后将逻辑分区重新通过mkfs.xfs命令重新格式化才能挂载上，这样的话这个逻辑分区上原来的数据就丢失了。其实没有什么意义。

 

 

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