From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pieter De Wit <pieter@insync.za.net>
Subject: Doesn't "writes" do what resync does ?
Date: Mon, 30 Dec 2013 12:16:42 +1300
Message-ID: <52C0AD5A.1040802@insync.za.net>
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To: linux-raid <linux-raid@vger.kernel.org>
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Hi List,

As per my previous email, I am busy shifting a bunch of data around. I 
have just created a new RAID1 set, following which MD started resyncing it.

Before that completed, I started shifting data onto it. I always thought 
that writing data to a new array, does "exactly" what resyncing does (it 
has to do all the same calcs etc)

This doesn't seem to be the case:

md2 : active raid1 sdd2[1] sda2[0]
       243567616 blocks super 1.2 [2/2] [UU]
       [===>.................]  resync = 17.2% (41949184/243567616) 
finish=122.3min speed=27454K/sec

yet:

   --- Physical volume ---
   PV Name               /dev/md2
   VG Name               RAID
   PV Size               232.28 GiB / not usable 35.00 MiB
   Allocatable           yes
   PE Size               4.00 MiB
   Total PE              59456
   Free PE               811
   Allocated PE          58645
   PV UUID               my6BsX-cSPD-MTKK-8U0t-ULVl-MKcA-LcAW2D

All the data on here was moved from another RAID device and currently 
contains about 200gig of data.

Should that resync not have had more completed ?

Cheers,

Pieter