From: Forza <forza@tnonline.net>
To: Leszek Dubiel <leszek@dubiel.pl>, linux-btrfs@vger.kernel.org
Subject: Re: Btrfs not using all devices in raid1
Date: Fri, 21 May 2021 22:11:38 +0200 (GMT+02:00) [thread overview]
Message-ID: <89853f6.7deb9c63.179908e0b59@tnonline.net> (raw)
In-Reply-To: <63123a58-18a4-24ff-3b30-9a0668c167c4@dubiel.pl>
---- From: Leszek Dubiel <leszek@dubiel.pl> -- Sent: 2021-05-21 - 18:34 ----
>
> Hello!
>
> Why Btrfs is not using /dev/sdc2?
> There is no line "Data,RAID1" for this disk.
> Isn't it supposed to use disk that has most of free space?
>
> Thanks for help :) :)
> Using Btrfs in production.
>
>
> Here are some command outputs:
>
>
>
> ### btrfs fi show /
>
> Label: none uuid: ea6ae51d-d9b0-4628-a8f3-3406e1dc59c6
> Total devices 4 FS bytes used 2.96TiB
> devid 1 size 7.25TiB used 3.20TiB path /dev/sda2
> devid 2 size 7.25TiB used 3.20TiB path /dev/sdb2
> devid 3 size 7.25TiB used 3.21TiB path /dev/sdd2
> devid 4 size 7.25TiB used 32.00MiB path /dev/sdc2
>
>
>
> ### btrfs fi df /
>
> Data, RAID1: total=4.49TiB, used=2.90TiB
> System, RAID1: total=64.00MiB, used=784.00KiB
> Metadata, RAID1: total=321.00GiB, used=56.08GiB
> GlobalReserve, single: total=512.00MiB, used=0.00B
>
>
>
> ### btrfs dev usa /
>
> /dev/sda2, ID: 1
> Device size: 7.25TiB
> Device slack: 0.00B
> Data,RAID1: 2.99TiB
> Metadata,RAID1: 210.00GiB
> System,RAID1: 64.00MiB
> Unallocated: 4.05TiB
>
> /dev/sdb2, ID: 2
> Device size: 7.25TiB
> Device slack: 0.00B
> Data,RAID1: 3.00TiB
> Metadata,RAID1: 210.00GiB
> Unallocated: 4.04TiB
>
> /dev/sdc2, ID: 4
> Device size: 7.25TiB
> Device slack: 0.00B ... no Data/RAID1
> System,RAID1: 32.00MiB
> Unallocated: 7.25TiB
>
> /dev/sdd2, ID: 3
> Device size: 7.25TiB
> Device slack: 0.00B
> Data,RAID1: 2.99TiB
> Metadata,RAID1: 222.00GiB
> System,RAID1: 32.00MiB
> Unallocated: 4.04TiB
>
>
>
> ### time btrfs balance start -dconvert=raid1,soft -mconvert=raid1,soft /
>
> Done, had to relocate 0 out of 4922 chunks
>
> real 0m0,522s
> user 0m0,000s
> sys 0m0,033s
>
>
Raid1 means two copies on different devices. This is fulfilled with the previous 3 drives so the 'soft' keyword is not going to help here.
You can do a full data balance (-dusage=100) to move some data across to the new disk. There is no need to do a metadata balance in this case, unless you want to convert to raid1c3 to have three copies of metadata.
If you do nothing, the filesystem will eventually balance itself as you add abs delete data.
https://btrfs.wiki.kernel.org/index.php/Balance_Filters
next prev parent reply other threads:[~2021-05-21 20:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-21 16:34 Btrfs not using all devices in raid1 Leszek Dubiel
2021-05-21 20:11 ` Forza [this message]
2021-05-21 21:10 ` Leszek Dubiel
2021-05-21 21:53 ` Forza
2021-05-22 2:08 ` Zygo Blaxell
2021-05-22 8:52 ` Leszek Dubiel
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