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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Mon, 22 Oct 2018 12:54:41 +0200
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Subject: Re: [linux-lvm] Why doesn't the lvmcache support the discard (trim)
	command?
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To: LVM general discussion and development <linux-lvm@redhat.com>, Ilia Zykov <mail@izyk.ru>

Dne 19. 10. 18 v 19:00 Ilia Zykov napsal(a):
>>
>> dm-writecache could be seen as 'extension' of your page-cache to held
>> longer list of dirty-pages...
>>
>> Zdenek
>>
> 
> Does it mean that the dm-writecache is always empty, after reboot?
> Thanks.
> 

No, writecache is journaled -  so after reboot used content is remembered and 
read for use.


Zdenek