projects / pve-docs.git / blame
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1 | LVM thin Backend |
| 2 | ---------------- | |
| fc3425bd | 3 | include::attributes.txt[] |
| 9801e1c3 DM |
4 | |
| 5 | Storage pool type: `lvmthin` | |
| 6 | ||
| 7 | LVM normally allocates blocks when you create a volume. LVM thin pools | |
| 8 | instead allocates blocks when they are written. This behaviour is | |
| 9 | called thin-provisioning, because volumes can be much larger than | |
| 10 | physically available space. | |
| 11 | ||
| 12 | You can use the normal LVM command line tools to manage and create LVM | |
| 13 | thin pools (see 'man lvmthin' for details). Assuming you already have | |
| 14 | a LVM volume group called `pve`, the following commands create a new | |
| 15 | LVM thin pool (size 100G) called `data`: | |
| 16 | ||
| 17 | ---- | |
| 18 | lvcreate -L 100G -n data pve | |
| 19 | lvconvert --type thin-pool pve/data | |
| 20 | ---- | |
| 21 | ||
| 22 | ||
| 23 | Configuration | |
| 24 | ~~~~~~~~~~~~~ | |
| 25 | ||
| 26 | The LVM thin backend supports the common storage properties `content`, `nodes`, | |
| 27 | `disable`, and the following LVM specific properties: | |
| 28 | ||
| 29 | `vgname`:: | |
| 30 | ||
| 31 | LVM volume group name. This must point to an existing volume group. | |
| 32 | ||
| 33 | `thinpool`:: | |
| 34 | ||
| 35 | The name of the LVM thin pool. | |
| 36 | ||
| 37 | ||
| 38 | .Configuration Example ('/etc/pve/storage.cfg') | |
| 39 | ---- | |
| 40 | lvmthin: local-lvm | |
| 41 | thinpool data | |
| 42 | vgname pve | |
| 43 | content rootdir,images | |
| 44 | ---- | |
| 45 | ||
| 46 | ||
| 47 | File naming conventions | |
| 48 | ~~~~~~~~~~~~~~~~~~~~~~~ | |
| 49 | ||
| 50 | The backend use basically the same naming conventions as the ZFS pool | |
| 51 | backend. | |
| 52 | ||
| 53 | vm-<VMID>-<NAME> // normal VM images | |
| 54 | ||
| 55 | ||
| 56 | Storage Features | |
| 57 | ~~~~~~~~~~~~~~~~ | |
| 58 | ||
| 59 | LVM thin is a block storage, but fully supports snapshots and clones | |
| 60 | efficiently. New volumes are automatically initialized with zero. | |
| 61 | ||
| 62 | It must be mentioned that LVM thin pools cannot be shared across | |
| 63 | multiple nodes, so you can only use them as local storage. | |
| 64 | ||
| 65 | .Storage features for backend `lvmthin` | |
| 66 | [width="100%",cols="m,m,3*d",options="header"] | |
| 67 | |============================================================================== | |
| 68 | |Content types |Image formats |Shared |Snapshots |Clones | |
| 69 | |images rootdir |raw |no |yes |yes | |
| 70 | |============================================================================== | |
| 71 | ||
| 72 | Examples | |
| 73 | ~~~~~~~~ | |
| 74 | ||
| 75 | List available LVM thin pools on volume group `pve`: | |
| 76 | ||
| 77 | # pvesm lvmthinscan pve | |
| 78 | ||
| deb4673f DM |
79 | ifdef::wiki[] |
| 80 | ||
| 81 | See Also | |
| 82 | ~~~~~~~~ | |
| 83 | ||
| 84 | * link:/index.php/Storage[Storage] | |
| 85 | ||
| 86 | endif::wiki[] |