Re: bcache-tools and bcache support in other linux packages

From: Hans de Goede <hdegoede@redhat.com>
To: Development discussions related to Fedora
	<devel@lists.fedoraproject.org>,
	Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>
Cc: linux-bcache@vger.kernel.org
Subject: Re: bcache-tools and bcache support in other linux packages
Date: Fri, 18 Oct 2013 14:15:50 +0200	[thread overview]
Message-ID: <52612676.4040702@redhat.com> (raw)
In-Reply-To: <CE86CB5C.BB96%rolf@rolffokkens.nl>

Hi,

On 10/18/2013 11:56 AM, Rolf Fokkens wrote:
> Hi all,
>
> We've been waiting to see if other people who couldn't make on Sunday
> would also do some testing. That hasn't happened, so a few words on my
> impressions on the test day are appropriate indeed.
>
> First of all not many people really did some testing. We didn't expect
> many people to participate, but the 3 people who did (many thanks to
> them!) were the bare minimum we anticipated. This was probably caused by
> the following:
> - SSD caching may need more explanation, not many people understand what
> it is and what the benefits are
> - Because it's hard to change an existing partition to a 'bcached'
> partition, it's not really tempting to test (there's a blocks utility
> under development that may help, currently backup-restore is the only way).
> - Not many people have the required resources available to do testing.
> Even when testing in a VM not many people have the required 10GB available
> (The requirements could be lowered top about 6GB, so that might help)
> - Installing F20 as requested in the prerequisites was harder to the
> testers than we anticipated. Specifically planning a specific partition
> layout in Anaconda requires a lot of attention (I could upload a VM image
> somewhere to facilitate that).
>
> About the testing itself:
> - the alignment of the tools (bcache-tools, kernel, util-linux and dracut)
> is really good now, people were able to do the testcases (1.A and 1.B)
> without a hitch.
> - nobody tested the LVM integration (testcases 2.A and 2.B), so no test
> results on that part.
> - Unfortunately kernel 3.11.4 (which was the latest version on Sunday)
> exhibited a bug during stress testing
> (https://bugzilla.redhat.com/show_bug.cgi?id=1018615), but that bug is
> supposed to be fixed in kernel 3.11.5 which was released later this week.
>
> So I think SSD Caching (using bcache) is in a good shape, but I would like
> to encourage people to do some more testing. Of course other feedback is
> also appreciated.

Good work, and thanks for the detailed summary!

Regards,

Hans
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