Volume management creates a layer of abstraction over physical storage, so logical storage volumes can be created. To use the disk for an LVM logical volume it must be initialized as a physical volume (PV). Initializing a block device as a physical volume places a label near the start of the device.
# pvcreate -v /dev/sdc /dev/sdd
Wiping cache of LVM-capable devices
Set up physical volume for "/dev/sdc" with 286739329 available sectors
Zeroing start of device /dev/sdc
Writing physical volume data to disk "/dev/sdc"
Physical volume "/dev/sdc" successfully created
Wiping cache of LVM-capable devices
Set up physical volume for "/dev/sdd" with 286739329 available sectors
Zeroing start of device /dev/sdd
Writing physical volume data to disk "/dev/sdd"
Physical volume "/dev/sdd" successfully created
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# pvs PV VG Fmt Attr PSize PFree /dev/sdc lvm2 a-- 136.73G 136.73G /dev/sdd lvm2 a-- 136.73G 136.73G |
# pvdisplay "/dev/sdc" is a new physical volume of "136.73 GB" --- NEW Physical volume --- PV Name /dev/sdc VG Name PV Size 136.73 GB Allocatable NO PE Size (KByte) 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID SaSfXm-996Y-YToO-Ogfm-EzFM-Nmm3-Sfh6Pu "/dev/sdd" is a new physical volume of "136.73 GB" --- NEW Physical volume --- PV Name /dev/sdd VG Name PV Size 136.73 GB Allocatable NO PE Size (KByte) 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID YmuTUH-5VHn-bGAe-dIAY-5G2m-wJJE-XHaG7L |
# pvscan PV /dev/sdc lvm2 [136.73 GB] PV /dev/sdd lvm2 [136.73 GB] Total: 2 [273.46 GB] / in use: 0 [0 ] / in no VG: 2 [273.46 GB] |
# pvremove /dev/sdd Labels on physical volume "/dev/sdd" successfully wiped |
# vgcreate volgroup1 /dev/sdc /dev/sdd Volume group "volgroup1" successfully created |
#vgs VG #PV #LV #SN Attr VSize VFree volgroup1 2 0 0 wz--n- 273.45G 273.45G # vgdisplay --- Volume group --- VG Name volgroup1 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 273.45 GB PE Size 4.00 MB Total PE 70004 Alloc PE / Size 0 / 0 Free PE / Size 70004 / 273.45 GB VG UUID oOdAA7-w1re-x6BD-i2vB-keeL-aPbz-UlubIa |
# vgreduce volgroup1 /dev/sdd Removed "/dev/sdd" from volume group "volgroup1" # vgs VG #PV #LV #SN Attr VSize VFree volgroup1 1 0 0 wz--n- 136.73G 136.73G |
# vgextend volgroup1 /dev/sdd Volume group "volgroup1" successfully extended #pvs PV VG Fmt Attr PSize PFree /dev/sdc volgroup1 lvm2 a-- 136.73G 136.73G /dev/sdd volgroup1 lvm2 a-- 136.73G 136.73G |
#lvmdiskscan /dev/ramdisk [ 16.00 MB] /dev/ram [ 16.00 MB] /dev/root [ 4.40 GB] /dev/ram2 [ 16.00 MB] /dev/sda2 [ 4.40 GB] /dev/ram3 [ 16.00 MB] /dev/sda3 [ 4.40 GB] /dev/ram4 [ 16.00 MB] /dev/sda4 [ 55.17 GB] /dev/ram5 [ 16.00 MB] /dev/ram6 [ 16.00 MB] /dev/ram7 [ 16.00 MB] /dev/ram8 [ 16.00 MB] /dev/ram9 [ 16.00 MB] /dev/ram10 [ 16.00 MB] /dev/ram11 [ 16.00 MB] /dev/ram12 [ 16.00 MB] /dev/ram13 [ 16.00 MB] /dev/ram14 [ 16.00 MB] /dev/ram15 [ 16.00 MB] /dev/sdb1 [ 68.36 GB] /dev/sdc [ 136.73 GB] LVM physical volume /dev/sdd [ 136.73 GB] LVM physical volume 3 disks 18 partitions 2 LVM physical volume whole disks 0 LVM physical volumes |
#lvcreate -L 10G -m1 -n mirr_log_vol_1 volgroup1 /dev/sdc /dev/sdd Logical volume "mirr_log_vol_1" created #lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert mirr_log_vol_1 volgroup1 mwi-a- 10.00G mirr_log_vol_1_mlog 1.17 #lvdisplay --- Logical volume --- LV Name /dev/volgroup1/mirr_log_vol_1 VG Name volgroup1 LV UUID nEtEhz-1qyR-rCHT-pYru-4YdP-N8vd-D5iibn LV Write Access read/write LV Status available # open 0 LV Size 10.00 GB Current LE 2560 Mirrored volumes 2 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 #lvscan ACTIVE '/dev/volgroup1/mirr_log_vol_1' [10.00 GB] inherit |
# mkfs.ext3 /dev/volgroup1/mirr_log_vol_1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
1310720 inodes, 2621440 blocks
131072 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2684354560
80 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
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#df -h /lv-mirror
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/volgroup1-mirr_log_vol_1
9.9G 151M 9.2G 2% /lv-mirror
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#lvs LV VG Attr LSize Origin Snap% Move Log Copy% Convert mirr_log_vol_1 volgroup1 mwi-ao 10.00G mirr_log_vol_1_mlog 100.00 mirr_log_vol_2 volgroup1 mwi-a- 5.00G mirr_log_vol_2_mlog 1.95 |
kernel: scsi 0:0:3:0: rejecting I/O to dead device kernel: device-mapper: raid1: A read failure occurred on a mirror device. lvm[5624]: Secondary mirror device 253:2 read failed. kernel: device-mapper: raid1: Trying different device. lvm[5624]: volgroup1-mirr_log_vol_1 is now in-sync. lvm[5624]: Device failure in volgroup1-mirr_log_vol_2. lvm[5624]: Couldn't find device with uuid vTabhs-mrX7-bZhG-E5yr-DNZ0-ffhL-n2zRAE. smartd[3459]: Device: /dev/sdd, No such device, open() failed |
#lvscan -v
Finding all logical volumes
Wiping cache of LVM-capable devices
Couldn't find device with uuid vTabhs-mrX7-bZhG-E5yr-DNZ0-ffhL-n2zRAE.
There are 1 physical volumes missing.
ACTIVE '/dev/volgroup1/mirr_log_vol_1' [10.00 GB] inherit
ACTIVE '/dev/volgroup1/mirr_log_vol_2' [5.00 GB] inherit
#pvs -v
Scanning for physical volume names
Wiping cache of LVM-capable devices
Couldn't find device with uuid vTabhs-mrX7-bZhG-E5yr-DNZ0-ffhL-n2zRAE.
There are 1 physical volumes missing.
There are 1 physical volumes missing.
PV VG Fmt Attr PSize PFree DevSize PV UUID
/dev/sdc volgroup1 lvm2 a-- 136.73G 121.73G 136.73G SaSfXm-996Y-YToO-Ogfm-EzFM-Nmm3-Sfh6Pu
unknown device volgroup1 lvm2 a-m 136.73G 136.73G 0 vTabhs-mrX7-bZhG-E5yr-DNZ0-ffhL-n2zRAE
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