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From: Neil Brown <neilb@cse.unsw.edu.au>
To: "Oleg A. Yurlov" <kris@spylog.com>
Date: Tue, 9 Oct 2001 09:26:32 +1000 (EST)
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Message-ID: <15298.13864.971940.46509@notabene.cse.unsw.edu.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: RAID sync
In-Reply-To: message from Oleg A. Yurlov on Monday October 1
In-Reply-To: <1101445461994.20011001182753@spylog.com>
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On Monday October 1, kris@spylog.com wrote:
> 
>         Kernel 2.4.6.SuSE-4GB-SMP, 2 CPU, 2Gb RAM, 4 HDD SCSI, M/B Intel L440GX.
> Messages from dmesg:
snip
> md: now!
> md: sdb2's event counter: 0000001c
> md: sda2's event counter: 0000001d
snip
> 
>         Why RAID do not start synchronization ? It is normal ?

Yes.
A difference of 1 in the event counters isn't considered enough to
treat on of them as old, and presumably the newest one (sda2) was
marked clean.
This could happen if the array was shut down cleanly, the new super
block (with the dirty bit cleared) was written to sda2, but the new
superblock was NOT written to sdb2 for some reason.  In this situation
there is no need to resync the array.

Could this be what happened in your case?

NeilBrown


> 
> --
> Oleg A. Yurlov aka Kris Werewolf, SysAdmin      OAY100-RIPN
> mailto:kris@spylog.com                          +7 095 332-03-88
> 
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