X-Git-Url: http://git.tuebingen.mpg.de/?p=aple.git;a=blobdiff_plain;f=LVM.m4;h=bf130769e1ccf4e73513c292de25f47bcc59ab32;hp=b02556a9193c88f3afe72cf2853500778cf25817;hb=6e180aa165b254a93547aa0fd897e129f9f020b7;hpb=e9a3585174e0fda1ac580d0e720f7ecc48bb9e9f diff --git a/LVM.m4 b/LVM.m4 index b02556a..bf13076 100644 --- a/LVM.m4 +++ b/LVM.m4 @@ -410,14 +410,13 @@ one PV to different PVs in the same VG. SECTION(«LVM Snapshots») -

LVM snapshots are based on the CoW optimization -strategy described earlier in the chapter on Unix -Concepts. Creating a snapshot means to create a CoW table of -the given size. Just before a LE of a snapshotted LV is about to be -written to, its contents are copied to a free slot in the CoW -table. This preserves an old version of the LV, the snapshot, which -can later be reconstructed by overlaying the CoW table atop the LV. +

LVM snapshots are based on the CoW optimization strategy described +earlier in the chapter on Unix +Concepts. Creating a snapshot means to create a CoW table of the +given size. Just before a LE of a snapshotted LV is about to be written +to, its contents are copied to a free slot in the CoW table. This +preserves an old version of the LV, the snapshot, which can later be +reconstructed by overlaying the CoW table atop the LV.

Snapshots can be taken from a LV which contains a mounted file system, while applications are actively modifying files. Without coordination