Mailinglist Archive: opensuse-features (91 mails)

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[openFATE 313130] Support btrfs RAID1 mirrored partitions
Feature changed by: Bat Pul (batpul)
Feature #313130, revision 3
Title: Support btrfs RAID1 mirrored partitions

openFATE: Unconfirmed
Priority
Requester: Important

Requested by: Bat Pul (batpul)
Partner organization: openSUSE.org

Description:
In release 12.1 openSUSE adds support for btrfs. The btrfs filesystem
supports several RAID configurations on the filesystem level. This is
great since now it is no longer necessary to use Multiple Devices or
other mechanisms to support RAID filesystems. Mirrored filesystems are
a means to increase data reliability and read speed. However, btrfs
mirrored filesystems are currently not supported during installation
nor in yast2. Since it is not trivial to add such a filesystem to a
openSUSE 12.1 system this is a useful addition. In addition there
should be integrated support in openSUSE to detect and recover from
situations where one partition fails which is part of a btrfs RAID1
filesystem.

Use Case:
It is far from trivial to accomplish integration of a RAID1 btrfs
mirrored filesystem in the system. Such a filesystem can be created
- with: mkfs.btrfs -L mylabel -m raid1 -d raid1 /dev/sda4 /dev/sdb4 This
- filesystem can then be mounted with: mount /dev/sda4 /mnt However,
- after reboot openSUSE 12.1 fails to mount this again with the identical
- command. As a response it gives the following two unclear messages in
- dmesg: btrfs: failed to read the system array on sda4 btrfs: open_ctree
- failed The trick is to specify both devices as: mount -o
- device=/dev/sda4,device=/dev/sdb4 /dev/sda4 /mnt The fstab entry should
- then become:
+ with:
+ mkfs.btrfs -L mylabel -m raid1 -d raid1 /dev/sda4 /dev/sdb4
+ This filesystem can then be mounted with:
+ mount /dev/sda4 /mnt
+ However, after reboot openSUSE 12.1 fails to mount this again with the
+ identical command. As a response it gives the following two unclear
+ messages in dmesg:
+ btrfs: failed to read the system array on sda4 btrfs: open_ctree failed
+ The trick is to specify both devices as:
+ mount -o device=/dev/sda4,device=/dev/sdb4 /dev/sda4 /mnt
+ The fstab entry should then become:
/dev/sda4 /mnt btrfs device=/dev/sda4,device=/dev/sdb4 1 2
Then after reboot the filesystem is mounted. Knowledge of these facts
and integration of btrfs RAID options during installation and in yast2
would help.
There currently doesn't appear to be a way to convert a single
partition root btrfs filesystem to RAID1. The only way to achieve a
RAID1 root partition is therefore during installation.



--
openSUSE Feature:
https://features.opensuse.org/313130

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