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Physical Volume
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| [1] | How to create LVM partition when a new hard disk is installed |
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[root@ns ~]# fdisk /dev/sdb # create a partition in new HD The number of cylinders for this disk is set to 20023. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): p # show partition table Disk /dev/sdb: 164.6 GB, 164696555520 bytes 255 heads, 63 sectors/track, 20023 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System # none Command (m for help): n # create a partition Command action e extended p primary partition (1-4) p # primary Partition number (1-4): 1 # partition number First cylinder (1-20023, default 1): # First cylinder Using default value 1 Last cylinder or +size or +sizeM or +sizeK (1-20023, default 20023): # Last cylinder Using default value 20023 Command (m for help): p # show partition table Disk /dev/sdb: 164.6 GB, 164696555520 bytes 255 heads, 63 sectors/track, 20023 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 20023 160834716 83 Linux # created Command (m for help): t # change partition type Selected partition 1 # number Hex code (type L to list codes): L # show list of type 0 Empty 1e Hidden W95 FAT1 80 Old Minix be Solaris boot 1 FAT12 24 NEC DOS 81 Minix / old Lin bf Solaris 2 XENIX root 39 Plan 9 82 Linux swap / So c1 DRDOS/sec 3 XENIX usr 3c PartitionMagic 83 Linux c4 DRDOS/sec 4 FAT16 <32M 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec 5 Extended 41 PPC PReP Boot 85 Linux extended c7 Syrinx 6 FAT16 42 SFS 86 NTFS volume set da Non-FS data 7 HPFS/NTFS 4d QNX4.x 87 NTFS volume set db CP/M / 8 AIX 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility 9 AIX bootable 4f QNX4.x 3rd part 8e Linux LVM df BootIt a OS/2 Boot Manag 50 OnTrack DM 93 Amoeba e1 DOS access b W95 FAT32 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O c W95 FAT32 (LBA) 52 CP/M 9f BSD/OS e4 SpeedStor e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs f W95 Ext'd (LBA) 54 OnTrackDM6 a5 FreeBSD ee EFI GPT 10 OPUS 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12 11 Hidden FAT12 56 Golden Bow a7 NeXTSTEP f0 Linux/PA- 12 Compaq diagnost 5c Priam Edisk a8 Darwin UFS f1 SpeedStor 14 Hidden FAT16 <3 61 SpeedStor a9 NetBSD f4 SpeedStor 16 Hidden FAT16 63 GNU HURD or Sys ab Darwin boot f2 DOS sec 17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fd Linux raid 18 AST SmartSleep 65 Novell Netware b8 BSDI swap fe LANstep 1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid ff BBT 1c Hidden W95 FAT3 75 PC/IX Hex code (type L to list codes): 8e # Linux LVM Changed system type of partition 1 to 8e (Linux LVM) Command (m for help): p # show partition tables Disk /dev/sdb: 164.6 GB, 164696555520 bytes 255 heads, 63 sectors/track, 20023 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 20023 160834716 8e Linux LVM # changed Command (m for help): w # save and exit The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. [root@ns ~]# sfdisk -l /dev/sdb # show status Disk /dev/sdb: 20023 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sdb1 0+ 20022 20023- 160834716 8e Linux LVM # created /dev/sdb2 0 - 0 0 0 Empty /dev/sdb3 0 - 0 0 0 Empty /dev/sdb4 0 - 0 0 0 Empty |
| [2] | Create a Physical Volume |
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[root@ns ~]# pvcreate /dev/sdb1 # create a Physical Volume Physical volume "/dev/sdb1" successfully created # input command like below if you would like to specify partition size [root@ns ~]# pvcreate --setphysicalvolumesize 100G /dev/sdb1 Physical volume "/dev/sdb1" successfully created |
| [3] | Display status of Physical volume |
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[root@ns ~]# pvdisplay /dev/sdb1 # display status --- NEW Physical volume --- PV Name /dev/sdb1 VG Name PV Size 153.38 GB Allocatable NO PE Size (KByte) 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID m1DOwB-iAmG-8qMn-5GWW-kVCh-d0VP-6N34H5 |
| [4] | Change volume size of Physical volume |
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# change a Physical volume to 100G [root@ns ~]# pvresize --setphysicalvolumesize 100G /dev/sdb1 Physical volume "/dev/sdb1" changed 1 physical volume(s) resized / 0 physical volume(s) not resized [root@ns ~]# pvdisplay /dev/sdb1 --- NEW Physical volume --- PV Name /dev/sdb1 VG Name PV Size 100.00 GB # changed Allocatable NO PE Size (KByte) 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID m1DOwB-iAmG-8qMn-5GWW-kVCh-d0VP-6N34H5 |
| [5] | Output reports of Physical volume |
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[root@ns ~]# pvs /dev/sdb1 PV VG Fmt Attr PSize PFree /dev/sdb1 lvm2 -- 100.00G 100.00G |
| [6] | Scan Physical volume |
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[root@ns ~]# pvscan /dev/sdb1 PV /dev/sda2 VG Xen lvm2 [152.56 GB / 46.56 GB free] PV /dev/sdc1 VG Xen lvm2 [74.50 GB / 37.50 GB free] PV /dev/sdb1 lvm2 [100.00 GB] Total: 3 [327.06 GB] / in use: 2 [227.06 GB] / in no VG: 1 [100.00 GB] |
| [7] | Remove Physical volume |
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[root@ns ~]# pvremove /dev/sdb1 Labels on physical volume "/dev/sdb1" successfully wiped [root@ns ~]# pvdisplay /dev/sdb1 No physical volume label read from /dev/sdb1 # removed Failed to read physical volume "/dev/sdb1" |
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