add warning about over-provisioning

diff --git a/pvesm.adoc b/pvesm.adoc
index bbdec4730f23f6f6a110c1362b643ed736552f16..462d9427c1965ecb2260c3a100adf03dd9541eb8 100644 (file)
--- a/pvesm.adoc
+++ b/pvesm.adoc
@@ -102,6 +102,11 @@ resizing the VMs filesystems.
 All storage types which have the 'Snapshots' feature also support thin
 provisioning.
 
+CAUTION: If a storage runs full, all guests using volumes on that
+storage receives IO error. This can cause file system inconsistencies
+and may corrupt your data. So it is advisable to avoid
+over-provisioning of your storage resources, or carefully observe
+free space to avoid such conditions.
 
 Storage Configuration
 ---------------------