From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jack Wang <xjtuwjp@gmail.com>
Subject: Re: [RFC] md raid resync counter
Date: Mon, 04 Nov 2013 10:26:42 +0100
Message-ID: <52776852.3020309@gmail.com>
References: <5273A5BC.5060109@gmail.com> <20131102104808.47834bdc@notabene.brown>
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To: NeilBrown <neilb@suse.de>
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On 11/02/2013 12:48 AM, NeilBrown wrote:
> On Fri, 01 Nov 2013 13:59:40 +0100 Jack Wang <xjtuwjp@gmail.com> wrote:
> 
>> Hi Neil and all,
>>
>> Is there anyway to know:
>>
>> 1. How often does a raid start to resync?
> 
> Look at your logs?
> 
>> 2. How many bytes did it resync?
> 
> Look at "mismatch_cnt" in sysfs (and multiply by 512).
> 
> NeilBrown
> 
>
Thanks Neil,

You're always very helpful :)

About the second one. As I checked in my system kernel 3.4.51

when raid is resync:
cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 dm-1[3] dm-2[2]
      23762944 blocks super 1.2 [2/1] [_U]
      [==>..................]  recovery = 10.7% (2562240/23762944)
finish=7.5min speed=46565K/sec
# cat /sys/block/md1/md/mismatch_cnt
0

cat /sys/block/md1/md/degraded
1
 cat /sys/block/md1/md/mismatch_cnt
0
# cat /sys/block/md1/md/sync_completed
8911488 / 47525888

mismatch_cnt is 0, sync_completed look what I want?

Jack