On 2018/11/28 下午3:20, Mikko Merikivi wrote: > Well, excuse me for thinking it wouldn't since in md-raid it worked. > https://wiki.archlinux.org/index.php/RAID#RAID_level_comparison > > Anyway, the error message is truly confusing for someone who doesn't > know about btrfs's implementation. I suppose in md-raid the near > layout is actually RAID 1 and far2 uses twice as much space. > https://en.wikipedia.org/wiki/Non-standard_RAID_levels#LINUX-MD-RAID-10 > > Well, I guess I'll go with RAID 1, then. Thanks for clearing up the confusion.
You should check mkfs.btrfs(8). It has a pretty good datasheet for all supported profiles under PROFILES section, and it mentions min/max devices. Thanks, Qu > ke 28. marrask. 2018 klo 3.14 Qu Wenruo (quwenruo.bt...@gmx.com) kirjoitti: >> >> >> >> On 2018/11/28 上午5:16, Mikko Merikivi wrote: >>> I seem unable to convert an existing btrfs device array to RAID 10. >>> Since it's pretty much RAID 0 and 1 combined, and 5 and 6 are >>> unstable, it's what I would like to use. >>> >>> After I did tried this with 4.19.2-arch1-1-ARCH and btrfs-progs v4.19, >>> I updated my system and tried btrfs balance again with this system >>> information: >>> [mikko@localhost lvdata]$ uname -a >>> Linux localhost 4.19.4-arch1-1-ARCH #1 SMP PREEMPT Fri Nov 23 09:06:58 >>> UTC 2018 x86_64 GNU/Linux >>> [mikko@localhost lvdata]$ btrfs --version >>> btrfs-progs v4.19 >>> [mikko@localhost lvdata]$ sudo btrfs fi show >>> Label: 'main1' uuid: c7cbb9c3-8c55-45f1-b03c-48992efe2f11 >>> Total devices 1 FS bytes used 2.90TiB >>> devid 1 size 3.64TiB used 2.91TiB path /dev/mapper/main >>> >>> Label: 'red' uuid: f3c781a8-0f3e-4019-acbf-0b783cf566d0 >>> Total devices 2 FS bytes used 640.00KiB >>> devid 1 size 931.51GiB used 2.03GiB path /dev/mapper/red1 >>> devid 2 size 931.51GiB used 2.03GiB path /dev/mapper/red2 >> >> RAID10 needs at least 4 devices. >> >> Thanks, >> Qu >> >>> [mikko@localhost lvdata]$ btrfs fi df /mnt/red/ >>> Data, RAID1: total=1.00GiB, used=512.00KiB >>> System, RAID1: total=32.00MiB, used=16.00KiB >>> Metadata, RAID1: total=1.00GiB, used=112.00KiB >>> GlobalReserve, single: total=16.00MiB, used=0.00B >>> >>> --- >>> >>> Here are the steps I originally used: >>> >>> [mikko@localhost lvdata]$ sudo cryptsetup luksFormat -s 512 >>> --use-random /dev/sdc >>> [mikko@localhost lvdata]$ sudo cryptsetup luksFormat -s 512 >>> --use-random /dev/sdd >>> [mikko@localhost lvdata]$ sudo cryptsetup luksOpen /dev/sdc red1 >>> [mikko@localhost lvdata]$ sudo cryptsetup luksOpen /dev/sdd red2 >>> [mikko@localhost lvdata]$ sudo mkfs.btrfs -L red /dev/mapper/red1 >>> btrfs-progs v4.19 >>> See http://btrfs.wiki.kernel.org for more information. >>> >>> Label: red >>> UUID: f3c781a8-0f3e-4019-acbf-0b783cf566d0 >>> Node size: 16384 >>> Sector size: 4096 >>> Filesystem size: 931.51GiB >>> Block group profiles: >>> Data: single 8.00MiB >>> Metadata: DUP 1.00GiB >>> System: DUP 8.00MiB >>> SSD detected: no >>> Incompat features: extref, skinny-metadata >>> Number of devices: 1 >>> Devices: >>> ID SIZE PATH >>> 1 931.51GiB /dev/mapper/red1 >>> >>> [mikko@localhost lvdata]$ sudo mount -t btrfs -o >>> defaults,noatime,nodiratime,autodefrag,compress=lzo /dev/mapper/red1 >>> /mnt/red >>> [mikko@localhost lvdata]$ sudo btrfs device add /dev/mapper/red2 /mnt/red >>> [mikko@localhost lvdata]$ sudo btrfs balance start -dconvert=raid10 >>> -mconvert=raid10 /mnt/red >>> ERROR: error during balancing '/mnt/red': Invalid argument >>> There may be more info in syslog - try dmesg | tail >>> code 1 >>> >>> [mikko@localhost lvdata]$ dmesg | tail >>> [12026.263243] BTRFS info (device dm-1): disk space caching is enabled >>> [12026.263244] BTRFS info (device dm-1): has skinny extents >>> [12026.263245] BTRFS info (device dm-1): flagging fs with big metadata >>> feature >>> [12026.275153] BTRFS info (device dm-1): checking UUID tree >>> [12195.431766] BTRFS info (device dm-1): enabling auto defrag >>> [12195.431769] BTRFS info (device dm-1): use lzo compression, level 0 >>> [12195.431770] BTRFS info (device dm-1): disk space caching is enabled >>> [12195.431771] BTRFS info (device dm-1): has skinny extents >>> [12205.815941] BTRFS info (device dm-1): disk added /dev/mapper/red2 >>> [12744.788747] BTRFS error (device dm-1): balance: invalid convert >>> data profile raid10 >>> >>> Converting to RAID 1 did work but what can I do to make it RAID 10? >>> With the up-to-date system it still says "invalid convert data profile >>> raid10". >>> >>
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