Can you RAID 10 with 2 drives?
A RAID 10 configuration comprises two or more mirrored pairs of drives. Drives that are on each “side” of the mirror have data striped across them in a RAID 0 format. So it’s possible to recover data if two drives in a RAID 10 configuration fail, but it’s dependent upon which two drives fail.
How does btrfs raid work?
If data corruption is detected, then btrfs will log errors to syslog. If RAID 1 is enabled, btrfs will also automatically fix the corrupted data by overwriting with by the correct duplicate. This process can also be automatically triggered by running btrfs scrub .
Which is an example of using btrfs with multiple devices?
The btrfs balance operation will take some time. It reads in all of the FS data and metadata and rewrites it across all the available devices. Depending on the usage scenario that is not needed, one example would be adding a new device to a RAID 1 filesystem whose existing devices still have enough space left.
What does Btrfs device delete missing mean in raid XX?
btrfs device delete missing tells btrfs to remove the first device that is described by the filesystem metadata but not present when the FS was mounted. In case of RAID XX layout, you cannot go below the minimum number of the device required. So before removing a device (even the missing one) you may need to add a new one.
Can a single device be used as a Btrfs Mount?
(See btrfs-space-calculator or btrfs disk usage calculator) Non-striped equivalents may give you a more effective use of space (single instead of RAID 0, RAID 1 instead of RAID 10). Once you create a multi-device filesystem, you can use any device in the FS for the mount command:
When does Btrfs need to be mounted in degraded mode?
But, if a device is missing or the super block has been corrupted, the filesystem will need to be mounted in degraded mode: btrfs device delete missing tells btrfs to remove the first device that is described by the filesystem metadata but not present when the FS was mounted.