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Re: btrfs raid configuration vs mdraid

From: Fredrik Salomonsson
Subject: Re: btrfs raid configuration vs mdraid
Date: Tue, 21 May 2019 09:35:36 -0700

Hi Giovanni,

Giovanni Biscuolo <address@hidden> writes:


>>> Assuming I'm going to format the root filesystem as:
>>>   mkfs.btrfs -m raid1 -d raid1 /dev/sda3 /dev/sdb3
>>> how should I configure (file-system...)? this way:
>>> (file-system
>>>   (mount-point "/")
>>>   (type "btrfs")
>>>   (device (uuid "4dab5feb-d176-45de-b287-9b0a6e4c01cb")))
>>> with UUID taken from "lsblk -f"?
>> That should work.
> I confirm it worked, easily! :-)

Good to know :).


>> One thing you should note is that guix might generate incorrect
>> paths for grub if you are using subvolumes. At least guix < 1.0 does
>> that for me, haven't tested 1.0+ yet. But I have been using a shell
>> script that works around that issue.
> I did not use root on a subvolume for my installation, but I'll try to
> reproduce it in a test install: can you please file a bug report for
> this, IMHO this should be fixed

Looks like there is already a bug report on this:

And I just tested to reconfigure my system with guix v1.0.1 and the
issue is still there.

>>> From you experience is RAID on brtfs as solid as the one on mdadm?
>> I have very little experience with mdadm, so can only speak of my
>> experience with btrfs and RAID-1. Which I have been using for 3+ years.
>> For me it has been solid. Only issue I have encountered was when my
>> fileserver lost power a few times leaving the filesystem corrupt. A
>> "btrfs check --repair" fixed that issue.
> Thanks for sharing! You give me courage to adopt btrfs more extensively
> :-)

Glad I could help out.


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