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From: NeilBrown <neilb@suse.de>
To: Rory Jaffe <rsjaffe@gmail.com>
Cc: linux-raid <linux-raid@vger.kernel.org>
Subject: Re: Resync intermittently writes to spare drives, waking them up
Date: Mon, 18 Apr 2011 10:55:18 +1000	[thread overview]
Message-ID: <20110418105518.2ef04e47@notabene.brown> (raw)
In-Reply-To: <BANLkTikqAaS91n06Xw7SwWcMKik_8E0iHA@mail.gmail.com>

On Wed, 13 Apr 2011 14:10:46 -0700 Rory Jaffe <rsjaffe@gmail.com> wrote:

> I have a RAID5 array with 4 active devices and two spares. The spares
> are normally in sleep mode. I ran a resync with:
> 
> echo repair > /sys/devices/virtual/block/md0/md/sync_action
> 
> About 20 times (evenly spaced apart) during the resync, the spares
> were written to, waking them up. Is that behavior desired? It seems to
> me that it's a waste--I don't know why the resync would bother with
> the spares.

Yes, there is room for optimisation there.  It really shouldn't write to
those devices.  I guess I should try (again) to fix that.

Thanks for the report.

NeilBrown

      parent reply	other threads:[~2011-04-18  0:55 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-13 21:10 Resync intermittently writes to spare drives, waking them up Rory Jaffe
2011-04-14  8:32 ` David Brown
2011-04-18  0:55 ` NeilBrown [this message]

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