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Subject: Re: Unexpected raid1 behaviour
To: Andrei Borzenkov <arvidjaar@gmail.com>,
        Chris Murphy <lists@colorremedies.com>, Tomasz Pala <gotar@polanet.pl>
Cc: Linux fs Btrfs <linux-btrfs@vger.kernel.org>
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From: "Austin S. Hemmelgarn" <ahferroin7@gmail.com>
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On 2017-12-20 11:53, Andrei Borzenkov wrote:
> 19.12.2017 22:47, Chris Murphy пишет:
>>
>>>
>>> BTW, doesn't SuSE use btrfs by default? Would you expect everyone using
>>> this distro to research every component used?
>>
>> As far as I'm aware, only Btrfs single device stuff is "supported".
>> The multiple device stuff is definitely not supported on openSUSE, but
>> I have no idea to what degree they support it with enterprise license,
>> no doubt that support must come with caveats.
>>
> 
> I was rather surprised seeing RAID1 and RAID10 listed as supported in
> SLES 12.x release notes, especially as there is no support for
> multi-device btrfs in YaST and hence no way to even install on such
> filesystem.
That's the beauty of it all though, you don't need to install on such a 
setup directly like you would need to with hardware RAID, you can 
install in single-device mode and then convert the system on-line to use 
multiple devices, and that will (usually) be faster than a direct 
install if you're using replication (unless you're using RAID10 and have 
a _lot_ of disks).