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From: Wols Lists <antlists@youngman.org.uk>
To: Paul Lawrence <paullawrence@google.com>
Cc: dm-devel@redhat.com, Linux kernel <linux-kernel@vger.kernel.org>,
	linux-raid@vger.kernel.org
Subject: Re: [RFC] dm-bow working prototype
Date: Thu, 25 Oct 2018 22:15:39 +0100	[thread overview]
Message-ID: <5BD2327B.1040908@youngman.org.uk> (raw)
In-Reply-To: <d00e361b-b849-3139-7e7a-02f05f3794c3@google.com>

On 25/10/18 19:13, Paul Lawrence wrote:
>> I have some questions about dm-bow:
>> – How file system agnostic this feature is planned to be? While it is
>> designed with ext4 in mind, is it going to work when used over other
>> file systems, like FAT or BTRFS for example?

> So long as the file system supports fstrim, it should work. If the file
> system creates a lot of churn say by running garbage collection, I'd not
> recommend it. And I really don't see the use case if the file system has
> any sort of snapshot capability - that will always be a superior
> solution to a block level one IMO.

Sorry for being dense, but why is this posted to linux-raid, then? Raid
does not support fstrim, and is filesystem-agnostic.

I can imagine people here being interested, but it feels to me as though
your functionality is completely orthogonal to raid. Sorry.

Cheers,
Wol

  reply	other threads:[~2018-10-25 21:52 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-23 21:23 Paul Lawrence
2018-10-23 22:18 ` Alasdair G Kergon
2018-10-24 18:42   ` Paul Lawrence
2018-10-24 19:24     ` [dm-devel] " Mikulas Patocka
2018-10-25  0:01       ` Alasdair G Kergon
2018-10-25 10:20       ` Bryn M. Reeves
2018-10-25 17:23       ` Paul Lawrence
2018-10-26 20:03         ` Mikulas Patocka
2018-10-29 16:51           ` Paul Lawrence
2018-11-15 23:15             ` Mikulas Patocka
2018-12-02 10:07               ` Sandeep Patil
2018-10-25 16:30 ` MegaBrutal
2018-10-25 18:13   ` Paul Lawrence
2018-10-25 21:15     ` Wols Lists [this message]
2018-10-25 21:43 ` [dm-devel] " Darrick J. Wong

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