From: NeilBrown [mailto:neilb@suse.com]
Sent: Sunday, June 18, 2017 2:35 PM
Subject: Re: mismatch_cnt > 0 during initial sync?


From the perspective of md, the initial sync is no different from any

other sync.  It

will count the number of mismatches that it finds and fixes.

Should a sync always fix a mismatch it encounters?   I have a RAID1 with 3
disks.  Sometimes I need to replace one disk and after adding a replacement
disk syslog indicates  "RebuildFinished event detected on md device
/dev/md/2, component device  mismatches found: 256 (on raid level 1)" but
says nothing about fixing it.

cat /sys/block/md2/md/last_sync_action
recovery

mdadm -V
mdadm - v3.3 - 3rd September 2013


Thank you,
Pete