Async verify HOWTO/man update

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 708eca0037293e80cc681c17f20d6638dc5c4cbd..5099c83c8fd7913773de58285ff323e2bdaec4d0 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -827,6 +827,19 @@ verify_fatal=bool  Normally fio will keep checking the entire contents
                before quitting on a block verification failure. If this
                option is set, fio will exit the job on the first observed
                failure.
+
+verify_async=int       Fio will normally verify IO inline from the submitting
+               thread. This option takes an integer describing how many
+               async offload threads to create for IO verification instead,
+               causing fio to offload the duty of verifying IO contents
+               to one or more separate threads. If using this offload
+               option, even sync IO engines can benefit from using an
+               iodepth setting higher than 1, as it allows them to have
+               IO in flight while verifies are running.
+
+verify_async_cpus=str  Tell fio to set the given CPU affinity on the
+               async IO verification threads. See cpus_allowed for the
+               format used.
                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization