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.
                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
                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization