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Linux HOWTO's - Disks and Volumes

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See also Device management under Linux and Linux Logical Volume Manager


Disk partition commands:

Clone a disk partition to another disk:

# sfdisk -d /dev/olddisk | sfdisk /dev/newdisk

To save partition info:

# sfdisk -d /dev/cciss/c0d0 > some/file

To restore:

# sfdisk /dev/cciss/c0d0 --force < some/file

List block devices:

# lsblk
NAME                                            MAJ:MIN  RM  SIZE RO TYPE
MOUNTPOINT
xvda                                            202:0     0   15G  0 disk 
`-xvda1                                         202:1     0  5.7G  0 part /
xvdm                                            202:192   0    1T  0 disk 
`-xvdm1                                         202:193   0 1024G  0 part 
  `-oraclevg06-oraclelv06 (dm-1)                253:1     0 1024G  0 lvm 
/oracle/exports
xvdk                                            202:160   0  128G  0 disk 
|-xvdk1                                         202:161   0   32G  0 part 
| |-oraclevg01-oraclelv01_mlog_mimage_0 (dm-20) 253:20    0    4M  0 lvm  
| | `-oraclevg01-oraclelv01_mlog (dm-22)        253:22    0    4M  0 lvm  
| |   `-oraclevg01-oraclelv01 (dm-25)           253:25    0 31.4G  0 lvm 
/oracle/network
| `-oraclevg01-oraclelv01_mimage_0 (dm-23)      253:23    0 31.4G  0 lvm  
|   `-oraclevg01-oraclelv01 (dm-25)             253:25    0 31.4G  0 lvm 
/oracle/network
|-xvdk2                                         202:162   0   32G  0 part 
| |-oraclevg02-oraclelv02_mlog_mimage_0 (dm-14) 253:14    0    4M  0 lvm  
| | `-oraclevg02-oraclelv02_mlog (dm-16)        253:16    0    4M  0 lvm  
| |   `-oraclevg02-oraclelv02 (dm-19)           253:19    0 31.4G  0 lvm 
/oracle
| `-oraclevg02-oraclelv02_mimage_0 (dm-17)      253:17    0 31.4G  0 lvm  
|   `-oraclevg02-oraclelv02 (dm-19)             253:19    0 31.4G  0 lvm 
/oracle
|-xvdk3                                         202:163   0   32G  0 part 
| |-oraclevg04-oraclelv04_mlog_mimage_0 (dm-8)  253:8     0    4M  0 lvm  
| | `-oraclevg04-oraclelv04_mlog (dm-10)        253:10    0    4M  0 lvm  
| |   `-oraclevg04-oraclelv04 (dm-13)           253:13    0 31.4G  0 lvm 
/oracle/product
| `-oraclevg04-oraclelv04_mimage_0 (dm-11)      253:11    0 31.4G  0 lvm  
|   `-oraclevg04-oraclelv04 (dm-13)             253:13    0 31.4G  0 lvm 
/oracle/product
`-xvdk4                                         202:164   0   32G  0 part 
  |-oraclevg03-oraclelv03_mlog_mimage_0 (dm-2)  253:2     0    4M  0 lvm  
  | `-oraclevg03-oraclelv03_mlog (dm-4)         253:4     0    4M  0 lvm  
  |   `-oraclevg03-oraclelv03 (dm-7)            253:7     0 31.3G  0 lvm 
/oracle/admin
  `-oraclevg03-oraclelv03_mimage_0 (dm-5)       253:5     0 31.3G  0 lvm  
    `-oraclevg03-oraclelv03 (dm-7)              253:7     0 31.3G  0 lvm 
/oracle/admin
xvdj                                            202:144   0  128G  0 disk 
|-xvdj1                                         202:145   0   32G  0 part 
| |-oraclevg01-oraclelv01_mlog_mimage_1 (dm-21) 253:21    0    4M  0 lvm  
| | `-oraclevg01-oraclelv01_mlog (dm-22)        253:22    0    4M  0 lvm  
| |   `-oraclevg01-oraclelv01 (dm-25)           253:25    0 31.4G  0 lvm 
/oracle/network
| `-oraclevg01-oraclelv01_mimage_1 (dm-24)      253:24    0 31.4G  0 lvm  
|   `-oraclevg01-oraclelv01 (dm-25)             253:25    0 31.4G  0 lvm 
/oracle/network
|-xvdj2                                         202:146   0   32G  0 part 
| |-oraclevg02-oraclelv02_mlog_mimage_1 (dm-15) 253:15    0    4M  0 lvm  
| | `-oraclevg02-oraclelv02_mlog (dm-16)        253:16    0    4M  0 lvm  
| |   `-oraclevg02-oraclelv02 (dm-19)           253:19    0 31.4G  0 lvm 
/oracle
| `-oraclevg02-oraclelv02_mimage_1 (dm-18)      253:18    0 31.4G  0 lvm  
|   `-oraclevg02-oraclelv02 (dm-19)             253:19    0 31.4G  0 lvm 
/oracle
|-xvdj3                                         202:147   0   32G  0 part 
| |-oraclevg04-oraclelv04_mlog_mimage_1 (dm-9)  253:9     0    4M  0 lvm  
| | `-oraclevg04-oraclelv04_mlog (dm-10)        253:10    0    4M  0 lvm  
| |   `-oraclevg04-oraclelv04 (dm-13)           253:13    0 31.4G  0 lvm 
/oracle/product
| `-oraclevg04-oraclelv04_mimage_1 (dm-12)      253:12    0 31.4G  0 lvm  
|   `-oraclevg04-oraclelv04 (dm-13)             253:13    0 31.4G  0 lvm 
/oracle/product
`-xvdj4                                         202:148   0   32G  0 part 
  |-oraclevg03-oraclelv03_mlog_mimage_1 (dm-3)  253:3     0    4M  0 lvm  
  | `-oraclevg03-oraclelv03_mlog (dm-4)         253:4     0    4M  0 lvm  
  |   `-oraclevg03-oraclelv03 (dm-7)            253:7     0 31.3G  0 lvm 
/oracle/admin
  `-oraclevg03-oraclelv03_mimage_1 (dm-6)       253:6     0 31.3G  0 lvm  
    `-oraclevg03-oraclelv03 (dm-7)              253:7     0 31.3G  0 lvm 
/oracle/admin
xvdh                                            202:112   0   32G  0 disk 
xvdg                                            202:96    0    1T  0 disk 
xvdi                                            202:128   0   32G  0 disk 
`-xvdi1                                         202:129   0   32G  0 part 
  `-oraclevg05-oraclelv05 (dm-26)               253:26    0   32G  0 lvm 
/oracle/media
xvdf                                            202:80    0    1T  0 disk 
xvdt                                            202:4864  0    1T  0 disk 
xvds                                            202:4608  0    1T  0 disk 
xvdr                                            202:4352  0  512G  0 disk 
`-xvdr1                                         202:4353  0  512G  0 part 
  `-oraclevg08-oraclelv08 (dm-27)               253:27    0    2T  0 lvm 
/oracle/backups
xvdq                                            202:4096  0  512G  0 disk 
`-xvdq1                                         202:4097  0  512G  0 part 
  `-oraclevg08-oraclelv08 (dm-27)               253:27    0    2T  0 lvm 
/oracle/backups
xvdp                                            202:240   0  512G  0 disk 
`-xvdp1                                         202:241   0  512G  0 part 
  `-oraclevg08-oraclelv08 (dm-27)               253:27    0    2T  0 lvm 
/oracle/backups
xvdo                                            202:224   0  512G  0 disk 
`-xvdo1                                         202:225   0  512G  0 part 
  `-oraclevg08-oraclelv08 (dm-27)               253:27    0    2T  0 lvm 
/oracle/backups
xvdn                                            202:208   0    1T  0 disk 
`-xvdn1                                         202:209   0 1024G  0 part 
  `-oraclevg07-oraclelv07 (dm-0)                253:0     0 1024G  0 lvm 
/oracle/arch
xvdw                                            202:5632  0    1T  0 disk 
xvdv                                            202:5376  0    1T  0 disk 
xvdu                                            202:5120  0  128G  0 disk 
xvdl                                            202:176   0   32G  0 disk

Determining what's on a volume or block device:

# blkid /dev/xvda1                       
/dev/xvda1: LABEL="_/" UUID="fafac3bd-e748-4dee-b0b3-66590ee717e2" TYPE="ext4" 
# blkid /dev/mapper/oraclevg08-oraclelv08
/dev/mapper/oraclevg08-oraclelv08: LABEL="/oracle/backups"
UUID="958002bb-058e-4942-bf95-601f70be47de" TYPE="ext3"

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Page last modified on May 08, 2014, at 11:45 AM EST