Re: [patch 4/5] fail-injection capability for disk IO

Jens Axboe
2006-08-23T12:01:37Z

On Wed, Aug 23 2006, Akinobu Mita wrote:
> This patch provides fail-injection capability for disk IO.
>
> Boot option:
>
> fail_make_request=<probability>,<interval>,<times>,<space>
>
> <probability>
>
> specifies how often it should fail in percent.
>
> <interval>
>
> specifies the interval of failures.
>
> <times>
>
> specifies how many times failures may happen at most.
>
> <space>
>
> specifies the size of free space where disk IO can be issued
> safely in bytes.
>
> Example:
>
> fail_make_request=100,10,-1,0
>
> generic_make_request() fails once per 10 times.

Hmm dunno, seems a pretty useless feature to me. Wouldn't it make a lot
more sense to do this per-queue instead of a global entity?

--
Jens Axboe