Create physical volume error can ' t OPEN/DEV/SDB5 exclusively. Mounted FileSystem's problem solving process record

Yum Server LVM expansion, the data directory is Yum storage rpm package directory, only 20G, need to add disk expansion to 80G

# DF-LH
Filesystem Size used Avail use% mounted on
/dev/mapper/vg_node5-root 20G 479M 18G 3%/
Tmpfs 935M 0 935M 0%/dev/shm
/DEV/SDA1 485M 39M 421M 9%/boot
/dev/mapper/vg_node5-data 20G 172M 19G 1%/data
/DEV/MAPPER/VG_NODE5-USR 9.7G 1.6G 7.6G 18%/usr
/dev/mapper/vg_node5-web 15G 165M 14G 2%/web


1. Add a piece of hard disk


2. Partition the hard disk, and adjust the format to 8e Linux LVM format
#Mount the system partition
# kpartx-l/dev/sdb
# KPARTX-AF/DEV/SDB
# partx-a/dev/sdb


3. Create a physical volume
When doing LVM on several disks, I encountered a problem that I had not encountered before:
# PVCREATE/DEV/SDB5
Can ' t OPEN/DEV/SDB5 exclusively. Mounted filesystem?
The first response is to see if the partition is already in use, but not.


To view some information about your hard disk:


# cat/proc/partitions
Major Minor #blocks name


8 0 83886080 SDA
8 1 512000 sda1
8 2 83373056 Sda2
8 125829120 SDB
8 1 SDB1
8 125796982 SDB5
253 0 20480000 dm-0
253 1 4096000 dm-1
253 2 15360000 Dm-2
253 3 20480000 dm-3
253 4 10240000 Dm-4
253 5 1 Dm-5
253 6 125796982 Dm-6




# fdisk/dev/sdb-l


disk/dev/sdb:128.8 GB, 128849018880 bytes
255 heads, Sectors/track, 15665 cylinders
Units = Cylinders of 16065 * 8225280 bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes
Disk identifier:0x44c662ff


Device Boot Start End Blocks Id System
/DEV/SDB1 1 15665 125829081 5 Extended
/DEV/SDB5 5 15665 125796982+ 8e Linux LVM


Then look at some of the underlying information:


Dmsetup is an underlying logical volume management, and DM should be the abbreviation for Device Mapper.
[Root@node5/]# dmsetup Status
sdb1:0 2 Linear
vg_node5-web:0 30720000 Linear
sdb5:0 251593965 Linear
vg_node5-usr:0 20480000 Linear
vg_node5-swap:0 8192000 Linear
vg_node5-root:0 40960000 Linear
vg_node5-data:0 40960000 Linear
[Root@node5/]# Dmsetup ls
SDB1 (253:5)
Vg_node5-web (253:2)
SDB5 (253:6)
VG_NODE5-USR (253:4)
Vg_node5-swap (253:1)
Vg_node5-root (253:0)
Vg_node5-data (253:3)


For example:
root@ubuntu:~# Dmsetup ls
35000c50026716847 (254, 2)
Vg_data-lv_home (254, 0)
35000c5002670f03e (254, 3)
35000c5002670f03e-part1 (254, 5)
35000c50026716847-part1 (254, 4)
Vg_data-lv_swap (254, 1)
You can see that 35000c5002670f03e and 35000c50026716847 make up the Multipath (multipathing)




# ll/dev/mapper/
Total 0
CRW-RW----1 root root, Jul 19:51 control
lrwxrwxrwx 1 root root 7 Jul 19:59 vg_node5-data. /dm-3
lrwxrwxrwx 1 root root 7 Jul 19:59/dev/sdb1. /dm-5
lrwxrwxrwx 1 root root 7 Jul 19:59/dev/sdb5. /dm-6
lrwxrwxrwx 1 root root 7 Jul 19:59 vg_node5-root. /dm-0
lrwxrwxrwx 1 root root 7 Jul 19:59 Vg_node5-swap. /dm-1
lrwxrwxrwx 1 root root 7 Jul 19:59 vg_node5-usr. /dm-4
lrwxrwxrwx 1 root root 7 Jul 19:59 vg_node5-web. /dm-2
You can create PV with dmsetup Remove XXX:


# Dmsetup REMOVE/DEV/SDB1
# Dmsetup REMOVE/DEV/SDB5


Re-creating the physical volume successfully
root@ubuntu:~# PVCREATE/DEV/SDB5
Physical volume "/DEV/SDB5" successfully created
You can also use Dmsetup remove_all to remove all.


# Vgdisplay
---Volume Group---
VG Name VG_NODE5
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access Read/write
VG Status resizable
MAX LV 0
Cur LV 5
Open LV 5
Max PV 0
Cur PV 1
ACT PV 1
VG Size 79.51 GiB
PE Size 4.00 MiB
Total PE 20354
Alloc pe/size 17250/67.38 GiB
Free Pe/size 3104/12.12 GiB
VG UUID Tnukxc-udqo-z8bk-ztoq-w93k-pqui-haxkja


4. Capacity expansion of physical volume VG_NODE5
# Vgextend VG_NODE5/DEV/SDB5
Volume Group "VG_NODE5" successfully extended
[Root@node5 ~]# VGs
VG #PV #LV #SN Attr vsize vfree
VG_NODE5 2 5 0 wz--n-199.47g 132.09g


Expanding the logical volume Vg_node5-data, or/data partition, to 80G
[Root@node5 ~]# lvextend-l 80g/dev/mapper/vg_node5-data
Extending logical volume data to 80.00 GiB
Logical Volume data successfully resized


Re-read size
[Root@node5 ~]# Resize2fs/dev/mapper/vg_node5-data
RESIZE2FS 1.41.12 (17-may-2010)
Filesystem At/dev/mapper/vg_node5-data is mounted on/data; On-line resizing required
Old desc_blocks = 2, new_desc_blocks = 5
Performing an on-line resize of/dev/mapper/vg_node5-data to 20971520 (4k) blocks.
The filesystem on/dev/mapper/vg_node5-data is now 20971520 blocks long.


[Root@node5 ~]# DF-LH
Filesystem Size used Avail use% mounted on
/dev/mapper/vg_node5-root 20G 479M 18G 3%/
Tmpfs 935M 0 935M 0%/dev/shm
/DEV/SDA1 485M 39M 421M 9%/boot
/dev/mapper/vg_node5-data 79G 184M 75G 1%/data
/DEV/MAPPER/VG_NODE5-USR 9.7G 1.6G 7.6G 18%/usr
/dev/mapper/vg_node5-web 15G 165M 14G 2%/web