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-rw-r--r--examples/guestfs-testing.pod24
1 files changed, 23 insertions, 1 deletions
diff --git a/examples/guestfs-testing.pod b/examples/guestfs-testing.pod
index adf5b04d..c35c3b86 100644
--- a/examples/guestfs-testing.pod
+++ b/examples/guestfs-testing.pod
@@ -102,7 +102,29 @@ L<virt-df(1)> lists disk space. Run:
virt-df
-Do the results match what's reported inside the guests?
+You can try comparing this to the results from L<df(1)> inside the
+guest, but there are some provisos:
+
+=over 4
+
+=item *
+
+The guest must be idle.
+
+=item *
+
+The guest disks must be synched using L<sync(1)>.
+
+=item *
+
+Any action such as booting the guest will write log files causing the
+numbers to change.
+
+=back
+
+We don't guarantee that the numbers will be identical even under these
+circumstances. They should be similar. It would indicate a bug if
+you saw greatly differing numbers.
=head2 Try importing virt-df CSV output into a spreadsheet or database.