ha-manager: clarifications and various fixes

[pve-docs.git] / pvesm.adoc

diff --git a/pvesm.adoc b/pvesm.adoc
index f0eb9b9d9f451684ecdbb4711fa8b8e86ea78914..bbdec4730f23f6f6a110c1362b643ed736552f16 100644 (file)
--- a/pvesm.adoc
+++ b/pvesm.adoc
@@ -83,6 +83,26 @@ snapshots and clones.
 TIP: It is possible to use LVM on top of an iSCSI storage. That way
 you get a 'shared' LVM storage.
 
+Thin provisioning
+~~~~~~~~~~~~~~~~~
+
+A number of storages, and the Qemu image format `qcow2`, support _thin
+provisioning_.  With thin provisioning activated, only the blocks that
+the guest system actually use will be written to the storage.
+
+Say for instance you create a VM with a 32GB hard disk, and after
+installing the guest system OS, the root filesystem of the VM contains
+3 GB of data.  In that case only 3GB are written to the storage, even
+if the guest VM sees a 32GB hard drive. In this way thin provisioning
+allows you to create disk images which are larger than the currently
+available storage blocks. You can create large disk images for your
+VMs, and when the need arises, add more disks to your storage without
+resizing the VMs filesystems.
+
+All storage types which have the 'Snapshots' feature also support thin
+provisioning.
+
+
 Storage Configuration
 ---------------------
 
@@ -308,6 +328,32 @@ Show filesystem path for a volume
 
  pvesm path <VOLUME_ID>
 
+ifdef::wiki[]
+
+See Also
+--------
+
+* link:/index.php/Storage:_Directory[Storage: Directory]
+
+* link:/index.php/Storage:_GlusterFS[Storage: GlusterFS]
+
+* link:/index.php/Storage:_User_Mode_iSCSI[Storage: User Mode iSCSI]
+
+* link:/index.php/Storage:_iSCSI[Storage: iSCSI]
+
+* link:/index.php/Storage:_LVM[Storage: LVM]
+
+* link:/index.php/Storage:_LVM_Thin[Storage: LVM Thin]
+
+* link:/index.php/Storage:_NFS[Storage: NFS]
+
+* link:/index.php/Storage:_RBD[Storage: RBD]
+
+* link:/index.php/Storage:_ZFS[Storage: ZFS]
+
+
+endif::wiki[]
+
 ifndef::wiki[]
 
 // backend documentation