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From: Mathijs Kwik <mathijs@bluescreen303.nl>
Date: Tue, 02 Jun 2015 09:35:06 +0200
Message-ID: <87r3puv9zp.fsf@bluescreen303.nl>
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Subject: Re: [linux-lvm] Cpy%Sync column - high disk activity after reboots
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To: zkabelac@redhat.com, linux-lvm@redhat.com

I'm sorry if I was unclear. But I'm not using writeback mode yet.
The period of disk activity after reboots occurs with writethrough mode.


> Hi
> 
> Cache is always flushing it's content to disk - so if you have the
> 'writeback' variant and there were some unwritten data which sits only
> in cache, they are automatically pushed to origin (cached) device -
> which is likely your disk activity.
> 
> Zdenek