svn commit: r216978 - in projects/graid/head/sys: cam/ata conf

[Warner Losh]

On 01/04/2011 16:37, Ivan Voras wrote:
> On 4 January 2011 23:44, Warner Losh<imp at freebsd.org>  wrote:
>> Author: imp
>> Date: Tue Jan  4 22:44:10 2011
>> New Revision: 216978
>> URL: http://svn.freebsd.org/changeset/base/216978
>>
>> Log:
>>   Implement three types of forced errors in the ada layer for the
>>   purpose of testing uppper layers in the stack.
>>
>>   kern.cam.ada.X.periodic_read_error specifies that every Nth read will
>>   fail.
>>
>>   kern.cam.ada.X.force_read_error specifies that the next N reads will fail.
>>
>>   kern.cam.ada.X.force_write_error specifies that the next N writes will fail.
>>
>>   These are enabled with 'options ADA_TEST_FAILURE'.  Otherwise, they
>>   aren't added to the kernel.  Also, the sysctl stuff is only used for
>>   this feature, so move it under this option ifdef.
> Maybe gnop would help you? (though on a different layer and
> nondeterministic failures)
Thanks for the suggestion.  I wasn't aware of that, and will add it to 
my toolkit.  These sysctls will help me force errors when I want them 
while testing graid behavior in a number of different scenarios.  gnop 
will help me cope with testing how they work out all together on flaky 
hardware w/o needing the flaky hardware.

Warner