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-rw-r--r--docs/misc/xl-disk-configuration.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/misc/xl-disk-configuration.txt b/docs/misc/xl-disk-configuration.txt
index 740b8f6429..5da5e11ea4 100644
--- a/docs/misc/xl-disk-configuration.txt
+++ b/docs/misc/xl-disk-configuration.txt
@@ -221,3 +221,14 @@ to specify several of these, for example:
"tap:aio:/some/path..."
All of these prefixes are now stripped and ignored.
+
+
+Missing format and empty target
+-------------------------------
+
+The following syntax is also supported:
+
+ ,<vdev>:<devtype>,<access> (deprecated)
+
+This is soley for compatibility with xend's syntax for empty cdroms,
+which is (for example) ",hdc:cdrom,r".