Adds verify_only option

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index e69cf4130696c55bf0af6cc3f224d6136af5666b..9830fa1ebd9510f693c3978c70c5c9121d7eabdd 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1068,6 +1068,13 @@ loops=int        Run the specified number of iterations of this job. Used
                to repeat the same workload a given number of times. Defaults
                to 1.
 
+verify_only    Do not perform specified workload---only verify data still
+               matches previous invocation of this workload. This option
+               allows one to check data multiple times at a later date
+               without overwriting it. This option makes sense only for
+               workloads that write data, and does not support workloads
+               with the time_based option set.
+
 do_verify=bool Run the verify phase after a write phase. Only makes sense if
                verify is set. Defaults to 1.
 
@@ -1106,7 +1113,9 @@ verify=str        If writing to a file, fio can verify the file contents
 
                        meta    Write extra information about each io
                                (timestamp, block number etc.). The block
-                               number is verified. See also verify_pattern.
+                               number is verified. The io sequence number is
+                               verified for workloads that write data.
+                               See also verify_pattern.
 
                        null    Only pretend to verify. Useful for testing
                                internals with ioengine=null, not for much