Update HOWTO as well for verify_backlog

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

diff --git a/HOWTO b/HOWTO
index d3639fb487d2c3fa206b1789ad59132e12e83e0c..7cb24dd8c12e764a7ff5c5c5c813efc775418311 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -935,13 +935,18 @@ verify_backlog=int        Fio will normally verify the written contents of a
                associated with an IO block in memory, so for large
                verify workloads, quite a bit of memory would be used up
                holding this meta data. If this option is enabled, fio
                associated with an IO block in memory, so for large
                verify workloads, quite a bit of memory would be used up
                holding this meta data. If this option is enabled, fio

+               will write only N blocks before verifying these blocks.
+

                will verify the previously written blocks before continuing
                to write new ones.
 
 verify_backlog_batch=int       Control how many blocks fio will verify
                if verify_backlog is set. If not set, will default to
                the value of verify_backlog (meaning the entire queue
                will verify the previously written blocks before continuing
                to write new ones.
 
 verify_backlog_batch=int       Control how many blocks fio will verify
                if verify_backlog is set. If not set, will default to
                the value of verify_backlog (meaning the entire queue

-               is read back and verified).
+               is read back and verified).  If verify_backlog_batch is
+               less than verify_backlog then not all blocks will be verified,
+               if verify_backlog_batch is larger than verify_backlog, some
+               blocks will be verified more than once.

                
 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


@@ -1287,4 +1292,4 @@ Split up, the format is as follows:
        IO latencies milliseconds: <=2, 4, 10, 20, 50, 100, 250, 500, 750, 1000, 2000, >=2000
        Additional Info (dependant on continue_on_error, default off): total # errors, first error code 
        
        IO latencies milliseconds: <=2, 4, 10, 20, 50, 100, 250, 500, 750, 1000, 2000, >=2000
        Additional Info (dependant on continue_on_error, default off): total # errors, first error code 
        

-       Additional Info (dependant on description being set): Text description
\ No newline at end of file
+       Additional Info (dependant on description being set): Text description