逻辑卷管理PV/VG/LV RAID

 

如何搭建 & 扩容 LVM

PV就是硬盘分区

VG是硬盘分区的集合

LV是VG的部分空间

[root@sky dev]# pvcreate /dev/sdd1 /dev/sdd4 /dev/sdd5 /dev/sdd6 /dev/sdd7
WARNING: ext4 signature detected on /dev/sdd1 at offset 1080. Wipe it? [y/n] y
Wiping ext4 signature on /dev/sdd1.
Physical volume "/dev/sdd1" successfully created
Physical volume /dev/sdd4 not found
Device /dev/sdd4 not found (or ignored by filtering).
WARNING: xfs signature detected on /dev/sdd5 at offset 0. Wipe it? [y/n] y
Wiping xfs signature on /dev/sdd5.
Physical volume "/dev/sdd5" successfully created
WARNING: ext3 signature detected on /dev/sdd6 at offset 1080. Wipe it? [y/n] y
Wiping ext3 signature on /dev/sdd6.
Physical volume "/dev/sdd6" successfully created
Physical volume "/dev/sdd7" successfully created
[root@sky dev]# vgcreate vg0  /dev/sdd1 /dev/sdd5 /dev/sdd6 /dev/sdd7
Volume group "vg0" successfully created
[root@sky dev]#
[root@sky dev]#
[root@sky dev]# lvcreate -L 1G -n lv0 vg0
Logical volume "lv0" created
[root@sky dev]#
[root@sky dev]# vgscan
Reading all physical volumes.  This may take a while...
Found volume group "rhel" using metadata type lvm2
Found volume group "vg0" using metadata type lvm2
[root@sky dev]#

[root@sky dev]# vgdisplay  vg0

  --- Volume group ---

  VG Name               vg0

  System ID

  Format                lvm2

  Metadata Areas        4

  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                4

  Act PV                4

  VG Size               3.98 GiB

  PE Size               4.00 MiB

  Total PE              1020

  Alloc PE / Size       256 / 1.00 GiB

  Free  PE / Size       764 / 2.98 GiB

  VG UUID               WuV3Xm-u4IM-QD2A-lqMJ-qHf5-XbkU-uUSBqE

[root@sky dev]#

[root@sky dev]# lvdisplay /dev/vg0/lv0

  --- Logical volume ---

  LV Path                /dev/vg0/lv0

  LV Name                lv0

  VG Name                vg0

  LV UUID                3U5Ijl-lpsv-n3EK-IXrZ-6HjH-SYr2-V0TwGW

  LV Write Access        read/write

  LV Creation host, time sky.com, 2015-11-29 17:49:59 +0800

  LV Status              available

  # open                 0

  LV Size                1.00 GiB

  Current LE             256

  Segments               2

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     8192

  Block device           253:3

[root@sky dev]# mkfs -t xfs /dev/vg0/lv0

meta-data=/dev/vg0/lv0           isize=256    agcount=4, agsize=65536 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=0

data     =                       bsize=4096   blocks=262144, imaxpct=25

         =                       sunit=0      swidth=0 blks

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

log      =internal log           bsize=4096   blocks=2560, version=2

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

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

[root@sky dev]# mkdir /home/lvtest

[root@sky dev]# mount /dev/vg0/lv0 /home/lvtest/

[root@sky dev]# df -hT

文件系统              类型      容量  已用  可用 已用% 挂载点

/dev/mapper/rhel-root xfs        17G  6.7G   10G   41% /

devtmpfs              devtmpfs  487M     0  487M    0% /dev

tmpfs                 tmpfs     496M   80K  496M    1% /dev/shm

tmpfs                 tmpfs     496M  7.2M  489M    2% /run

tmpfs                 tmpfs     496M     0  496M    0% /sys/fs/cgroup

/dev/sda1             xfs       497M  102M  395M   21% /boot

/dev/mapper/rhel-var  xfs       997M  243M  755M   25% /var

/dev/mapper/vg0-lv0   xfs      1014M   33M  982M    4% /home/lvtest

[root@sky dev]#

LV扩容：

[root@sky dev]# umount /dev/vg0/lv0
[root@sky dev]# lvextend -L 2G /dev/vg0/lv0
Extending logical volume lv0 to 2.00 GiB
Logical volume lv0 successfully resized

[root@sky dev]# resize2fs -f /dev/vg0/lv0
resize2fs 1.42.9 (28-Dec-2013)
The filesystem is already 524288 blocks long.  Nothing to do!

[root@sky dev]#

[root@sky dev]# mount /dev/vg0/lv0 /home/lvtest/
[root@sky dev]# df -hT
文件系统              类型      容量  已用  可用 已用% 挂载点
/dev/mapper/rhel-root xfs        17G  6.7G   10G   41% /
devtmpfs              devtmpfs  487M     0  487M    0% /dev
tmpfs                 tmpfs     496M   80K  496M    1% /dev/shm
tmpfs                 tmpfs     496M  7.2M  489M    2% /run
tmpfs                 tmpfs     496M     0  496M    0% /sys/fs/cgroup
/dev/sda1             xfs       497M  102M  395M   21% /boot
/dev/mapper/rhel-var  xfs       997M  243M  755M   25% /var
/dev/mapper/vg0-lv0   ext4      2.0G  6.0M  1.8G    1% /home/lvtest
[root@sky dev]#

 

vi /etc/fstab

umount /dev/vg0/lv0

cp /etc/*.conf /home/lvtest/

ls ./ | wc –l

 

硬RAID、软RAID

RAID0    加速

RAID1    备份

RAID5    包含12,存储效率高

RAID10

RAID01





 

[root@sky ~]# mdadm -Cv /dev/md0 -a yes -n 3 -l 5 /dev/sdb /dev/sdc /dev/sdd
mdadm: layout defaults to left-symmetric
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 512K
mdadm: /dev/sdb appears to be part of a raid array:
level=raid0 devices=0 ctime=Thu Jan  1 08:00:00 1970
mdadm: partition table exists on /dev/sdb but will be lost or
meaningless after creating array
mdadm: size set to 2095616K
mdadm: largest drive (/dev/sdb) exceeds size (2095616K) by more than 1%
Continue creating array?
Continue creating array? (y/n) y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
[root@sky ~]#  mdadm -Q /dev/md0
/dev/md0: 3.100GiB raid5 3 devices, 0 spares. Use mdadm --detail for more detail.
[root@sky ~]#  mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Nov 29 18:59:42 2015
Raid Level : raid5
Array Size : 4191232 (4.00 GiB 4.29 GB)
Used Dev Size : 2095616 (2046.84 MiB 2145.91 MB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent

Update Time : Sun Nov 29 18:59:56 2015
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 512K

Name : sky.com:0  (local to host sky.com)
UUID : 1e38c834:6e11129b:ec1e8abf:d9439688
Events : 18

Number   Major   Minor   RaidDevice State
0       8       16        0      active sync   /dev/sdb
1       8       32        1      active sync   /dev/sdc
3       8       48        2      active sync   /dev/sdd

[root@sky ~]#  mdadm /dev/md0 -f /dev/sdb

mdadm: set /dev/sdb faulty in /dev/md0

[root@sky ~]#  mdadm -D /dev/md0

/dev/md0:

        Version : 1.2

  Creation Time : Sun Nov 29 18:59:42 2015

     Raid Level : raid5

     Array Size : 4191232 (4.00 GiB 4.29 GB)

  Used Dev Size : 2095616 (2046.84 MiB 2145.91 MB)

   Raid Devices : 3

  Total Devices : 3

    Persistence : Superblock is persistent

    Update Time : Sun Nov 29 19:05:13 2015

          State : clean, degraded

Active Devices : 2

Working Devices : 2

Failed Devices : 1

  Spare Devices : 0

         Layout : left-symmetric

     Chunk Size : 512K

           Name : sky.com:0  (local to host sky.com)

           UUID : 1e38c834:6e11129b:ec1e8abf:d9439688

         Events : 20

    Number   Major   Minor   RaidDevice State

       0       0        0        0      removed

       1       8       32        1      active sync   /dev/sdc

       3       8       48        2      active sync   /dev/sdd

       0       8       16        -      faulty   /dev/sdb

[root@sky ~]#

[root@sky ~]#  mdadm -S /dev/md0

mdadm: stopped /dev/md0

[root@sky ~]#