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

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Hi,

I tested F20 on a physical host with a vertex3 ssd.
But it was not a requested test case, i re-used a md raid0 with a 6gb
partition of the ssd.

The file-system was setup as a storage pool for virt-manager.

I did not experience any issues, i installed 2 F20 guest at the same time.
I even rebooted many times and it survived several kernel updates.
I did not test a power-loss scenario. I has been working ok since a
couple of days.

The only thing that i can recall as strange is the fact that bcache
seems to not to use discard/trim for some reason.

I also did the non lvm tests on guest, without any issue.

Cheers.

On Fri, Oct 18, 2013 at 6:56 AM, Rolf Fokkens <rolf@xxxxxxxxxxxxxx> 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.
>
> Thanks,
>
> Rolf
>
> Op 10/18/13 11:22 AM schreef Piergiorgio Sartor
> <piergiorgio.sartor@xxxxxxxx>:
>
>>On Thu, Sep 26, 2013 at 11:56:25AM +0200, Rolf Fokkens wrote:
>>[...]
>>> The SSD Cache Fedora test day
>>> =============================
>>> On 13th of October there's an "SSD Cache Fedora test day": see the
>>> Wiki page
>>> https://fedoraproject.org/wiki/Test_Day:2013-10-13_SSD_Cache. This
>>> page is work in progress, any feedback is welcome. People interested
>>> in testing are invited to participate on 13th of October.
>>>
>>> When there's anything new toreport, I'll keep you posted.
>>
>>Hi Rolf,
>>
>>could you spend few words about the results
>>of the SSD Cache Fedora test day?
>>
>>Anything interesting or surprising happened?
>>Any disappointment?
>>
>>Thanks,
>>
>>bye,
>>
>>--
>>
>>piergiorgio
>
>
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