On Wed, Jan 26, 2011 at 3:04 PM, Malahal Naineni <malahal@xxxxxxxxxx> wrote:
nishant mungse [nishantmungse@xxxxxxxxx] wrote:There is no actual 'fail list' of mirror legs. The error_count is never
>
> Â Âhello all,
> Â ÂThere is one doubt regarding the dm-raid1. As far as i know, in dm-raid1
> Â Âthe data is written parallellyï on all the mirrors of mirrorset and if any
> Â Âof the mirror fails to write the data then dm-mirror adds this mirror to
> Â Âfail list by increasing the error count in "fail mirror" function in
> Â Âdm-raid1.
> Â ÂActually my doubt is where this error count is decremented? i.e after
> Â Âkcpyd or before and where exactly this error count is decremented?
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:
   Â/*
    * error_count is used for nothing more than a
    * simple way to tell if a device has encountered
    * errors.
    */
   Âatomic_inc(&m->error_count);
Hope that helps,
Malahal.
Hi Malahal
Thanks for reply. I am not able to understand what this "INIT_WORK(&ms->kmirrord_work, do_mirror)" function does. It is written in mirror_ctr of dm-raid1. What i think is whenever a bio comes dm_mirror will be called if that is case then why this is written in mirror_ctr. Please answer this.
Regards,
Nishant.
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