Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 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: 0x000cb3f1
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 1045 7875584 8e Linux LVM
Disk /dev/sdb: 268 MB, 268435456 bytes
255 heads, 63 sectors/track, 32 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: 0x00000000
Disk /dev/sdc: 268 MB, 268435456 bytes
255 heads, 63 sectors/track, 32 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: 0x00000000
Disk /dev/mapper/vg_centos-lv_root: 7205 MB, 7205814272 bytes
255 heads, 63 sectors/track, 876 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: 0x00000000
Disk /dev/mapper/vg_centos-lv_swap: 855 MB, 855638016 bytes
255 heads, 63 sectors/track, 104 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: 0x00000000
Use the whole disk to create PV physical volume
[root@centos ~]# pvcreate -f /dev/sdb
Physical volume "/dev/sdb" successfully created
[root@centos ~]# pvdisplay /dev/sdb
"/dev/sdb" is a new physical volume of "256.00 MiB"
--- NEW Physical volume ---
PV Name /dev/sdb
VG Name
PV Size 256.00 MiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID K98U9x-b5pF-qeZx-h0US-f3qA-zjiu-ZBsFHe
[root@centos ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_centos lvm2 a-- 7.51g 0
/dev/sdb lvm2 a-- 256.00m 256.00m
Create another PV physical volume
[root@centos ~]# pvcreate -f /dev/sdc
Physical volume "/dev/sdc" successfully created
[root@centos ~]# pvdisplay /dev/sdc
"/dev/sdc" is a new physical volume of "256.00 MiB"
--- NEW Physical volume ---
PV Name /dev/sdc
VG Name
PV Size 256.00 MiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID cWtHVh-I6d9-vXGg-CD46-rk8U-9q8o-tlmIjx
[root@centos ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_centos lvm2 a-- 7.51g 0
/dev/sdb lvm2 a-- 256.00m 256.00m
/dev/sdc lvm2 a-- 256.00m 256.00m
Now PVs are ready. We can create VG volume group.
[root@centos ~]# vgcreate vg1 /dev/sdb /dev/sdc
Volume group "vg1" successfully created
[root@centos ~]# vgdisplay -v vg1
Using volume group(s) on command line
Finding volume group "vg1"
--- Volume group ---
VG Name vg1
System ID
Format lvm2
Metadata Areas 2
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 2
Act PV 2
VG Size 504.00 MiB
PE Size 4.00 MiB
Total PE 126
Alloc PE / Size 0 / 0
Free PE / Size 126 / 504.00 MiB
VG UUID DAuthU-edqB-OPpM-KdZn-OqLM-HsxI-OhNnrA
--- Physical volumes ---
PV Name /dev/sdb
PV UUID K98U9x-b5pF-qeZx-h0US-f3qA-zjiu-ZBsFHe
PV Status allocatable
Total PE / Free PE 63 / 63
PV Name /dev/sdc
PV UUID cWtHVh-I6d9-vXGg-CD46-rk8U-9q8o-tlmIjx
PV Status allocatable
Total PE / Free PE 63 / 63
[root@centos dev]# vgs
VG #PV #LV #SN Attr VSize VFree
vg1 2 0 0 wz--n- 504.00m 504.00m
vg_centos 1 2 0 wz--n- 7.51g 0
Now create mirrored LV logical volume
[root@centos dev]# lvcreate -L 50M -m 1 -n lvol1 vg1
Rounding up size to full physical extent 52.00 MiB
Logical volume "lvol1" created
[root@centos dev]# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lvol1 vg1 mwi-a-m--- 52.00m lvol1_mlog 100.00
lv_root vg_centos -wi-ao---- 6.71g
lv_swap vg_centos -wi-ao---- 816.00m
[root@centos dev]# lvdisplay -v /dev/vg1/lvol1
Using logical volume(s) on command line
--- Logical volume ---
LV Path /dev/vg1/lvol1
LV Name lvol1
VG Name vg1
LV UUID 4YGNqt-VcUr-kvec-AV9N-9nBR-HLGR-96Q8bi
LV Write Access read/write
LV Creation host, time centos, 2014-04-05 13:10:09 -0400
LV Status available
# open 0
LV Size 52.00 MiB
Current LE 13
Mirrored volumes 2
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:5
lrwxrwxrwx. 1 root root 7 Apr 5 13:17 /dev/vg1/lvol1 -> ../dm-5
[root@centos dev]# ls -ld /dev/dm-5
brw-rw----. 1 root disk 253, 5 Apr 5 13:17 /dev/dm-5 (block special device node)
[root@centos dev]# mkfs -t ext3 /dev/vg1/lvol1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
13328 inodes, 53248 blocks
2662 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=54525952
7 block groups
8192 blocks per group, 8192 fragments per group
1904 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 26 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
Now mount the file system
vi /etc/fstab and add the following line :
/dev/vg1/lvol1 /ap1 ext3 defaults 0 0
[root@centos dev]# mkdir /ap1
[root@centos dev]# mount /ap1
[root@centos dev]# df -h /ap1
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg1-lvol1 51M 4.9M 43M 11% /ap1
Check the output from tune2fs
# tune2fs -l /dev/mapper/vg1-lvol1
tune2fs 1.41.12 (17-May-2010)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 83def42c-7412-4115-ae58-2c34acefb1db
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 13328
Block count: 53248
Reserved block count: 2662
Free blocks: 46604
Free inodes: 13317
First block: 1
Block size: 1024
Fragment size: 1024
Reserved GDT blocks: 207
Blocks per group: 8192
Fragments per group: 8192
Inodes per group: 1904
Inode blocks per group: 238
Filesystem created: Sat Apr 5 13:17:10 2014
Last mount time: Sat Apr 5 13:24:32 2014
Last write time: Sat Apr 5 13:24:32 2014
Mount count: 1 (-C mount-count)
Maximum mount count: 26 (-c max-mount-counts)
Last checked: Sat Apr 5 13:17:10 2014
Check interval: 15552000 (6 months)
Next check after: Thu Oct 2 13:17:10 2014
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: c0487ec4-6718-4ec5-b761-c6308d0c3c18
Journal backup: inode blocks
tune2fs 1.41.12 (17-May-2010)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 83def42c-7412-4115-ae58-2c34acefb1db
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 13328
Block count: 53248
Reserved block count: 2662
Free blocks: 46604
Free inodes: 13317
First block: 1
Block size: 1024
Fragment size: 1024
Reserved GDT blocks: 207
Blocks per group: 8192
Fragments per group: 8192
Inodes per group: 1904
Inode blocks per group: 238
Filesystem created: Sat Apr 5 13:17:10 2014
Last mount time: Sat Apr 5 13:24:32 2014
Last write time: Sat Apr 5 13:24:32 2014
Mount count: 1 (-C mount-count)
Maximum mount count: 26 (-c max-mount-counts)
Last checked: Sat Apr 5 13:17:10 2014
Check interval: 15552000 (6 months)
Next check after: Thu Oct 2 13:17:10 2014
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: c0487ec4-6718-4ec5-b761-c6308d0c3c18
Journal backup: inode blocks
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