Check / Automatic repair

Check / Automatic repair

[Fabien Bourigault]

Hi,

I was reading the kernel md.txt documentation and found that couple of
sentences about sync_action :

496        check         - A full check of redundancy was requested and is
497                        happening.  This reads all block and checks
498                        them. A repair may also happen for some raid
499                        levels.


What levels/configurations are affected by the "A repair may also
happen for some raid levels." sentence ?

Regards

Re: Check / Automatic repair

[NeilBrown]

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On Mon, 21 May 2012 12:09:47 +0200 Fabien Bourigault <dradge@gmail.com> wrote:

> Hi,
> 
> I was reading the kernel md.txt documentation and found that couple of
> sentences about sync_action :
> 
> 496        check         - A full check of redundancy was requested and is
> 497                        happening.  This reads all block and checks
> 498                        them. A repair may also happen for some raid
> 499                        levels.
> 
> 
> What levels/configurations are affected by the "A repair may also
> happen for some raid levels." sentence ?

Someone really should find time to fix up that file....

I don't remember the details of what it meant at the time, but with current
code 'check' means a check is happening for all raid levels, and 'repair'
means a repair is happening.

NeilBrown

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Re: Check / Automatic repair

[Fabien Bourigault]

So, what really happens if I do :

echo "check" > /sys/block/md0/md/sync_action

or :

echo "repair" > /sys/block/md0/md/sync_action

?

2012/5/21 NeilBrown <neilb@suse.de>:
> On Mon, 21 May 2012 12:09:47 +0200 Fabien Bourigault <dradge@gmail.com> wrote:
>
>> Hi,
>>
>> I was reading the kernel md.txt documentation and found that couple of
>> sentences about sync_action :
>>
>> 496        check         - A full check of redundancy was requested and is
>> 497                        happening.  This reads all block and checks
>> 498                        them. A repair may also happen for some raid
>> 499                        levels.
>>
>>
>> What levels/configurations are affected by the "A repair may also
>> happen for some raid levels." sentence ?
>
> Someone really should find time to fix up that file....
>
> I don't remember the details of what it meant at the time, but with current
> code 'check' means a check is happening for all raid levels, and 'repair'
> means a repair is happening.
>
> NeilBrown
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Re: Check / Automatic repair

[NeilBrown]

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On Mon, 21 May 2012 13:25:42 +0200 Fabien Bourigault <dradge@gmail.com> wrote:

> So, what really happens if I do :
> 
> echo "check" > /sys/block/md0/md/sync_action
> 
> or :
> 
> echo "repair" > /sys/block/md0/md/sync_action
> 
> ?

"man md"

look for "SCRUBBING AND MISMATCHES"

NeilBrown

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