storage: lvm: expand on description of saferemove option

mentioning why zeroing-out might be necessary.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

diff --git a/pve-storage-lvm.adoc b/pve-storage-lvm.adoc
index 917d8fbcbe9e9078f1fa04408768ff800cbfe304..cff5d3eeaa21bee8745700ce9b3dd7dc5f2b5205 100644 (file)
--- a/pve-storage-lvm.adoc
+++ b/pve-storage-lvm.adoc
@@ -38,7 +38,10 @@ on a remote iSCSI server.
 `saferemove`::
 
 Zero-out data when removing LVs. When removing a volume, this makes
-sure that all data gets erased.
+sure that all data gets erased and cannot be accessed by other LVs
+created later (which happen to be assigned the same physical extents).
+This is a costly operation, but may be required as a security measure
+in certain environments.
 
 `saferemove_throughput`::