linux-kernel - Re: O_DIRECT to md raid 6 is slow

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Message-ID: <20120816124112.2aa22f3e@natsu>
Date:	Thu, 16 Aug 2012 12:41:12 +0600
From:	Roman Mamedov <rm@...anrm.ru>
To:	stan@...dwarefreak.com
Cc:	Andy Lutomirski <luto@...capital.net>,
	John Robinson <john.robinson@...nymous.org.uk>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: O_DIRECT to md raid 6 is slow

On Wed, 15 Aug 2012 18:50:44 -0500
Stan Hoeppner <stan@...dwarefreak.com> wrote:

> TTBOMK there are two, and only two, COW filesystems in existence:  ZFS and BTRFS.

There is also NILFS2: http://www.nilfs.org/en/
And in general, any https://en.wikipedia.org/wiki/Log-structured_file_system
is COW by design, but afaik of those only NILFS is also in the mainline Linux
kernel AND is not aimed just for some niche like flash-based devices, but for
general-purpose usage.

-- 
With respect,
Roman

~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Stallman had a printer,
with code he could not see.
So he began to tinker,
and set the software free."

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