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.
 
                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.
 
 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
 
                        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
 
                        null    Only pretend to verify. Useful for testing
                                internals with ioengine=null, not for much