nishant mungse [nishantmungse@xxxxxxxxx] wrote:
>
> hello all,
> There is one doubt regarding the dm-raid1. As far as i know, in dm-raid1
> the data is written parallellyï on all the mirrors of mirrorset and if any
> of the mirror fails to write the data then dm-mirror adds this mirror to
> fail list by increasing the error count in "fail mirror" function in
> dm-raid1.
> Actually my doubt is where this error count is decremented? i.e after
> kcpyd or before and where exactly this error count is decremented?
There is no actual 'fail list' of mirror legs. The error_count is never
decremented. The 'error_count' is only used to tell if the mirror leg
has encountered errors. The only way to clear that counter is
re-loading the table!
See the comment:
/*
* error_count is used for nothing more than a
* simple way to tell if a device has encountered
* errors.
*/
atomic_inc(&m->error_count);
Hope that helps,
Malahal.
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