|author||David Sterba <firstname.lastname@example.org>||2018-03-02 22:56:53 +0100|
|committer||David Sterba <email@example.com>||2019-11-18 17:51:49 +0100|
|parent||btrfs: sink write flags to cow_file_range_async (diff)|
btrfs: add support for 3-copy replication (raid1c3)
Add new block group profile to store 3 copies in a simliar way that current RAID1 does. The profile attributes and constraints are defined in the raid table and used by the same code that already handles the 2-copy RAID1. The minimum number of devices is 3, the maximum number of devices/chunks that can be lost/damaged is 2. Like RAID6 but with 33% space utilization. Signed-off-by: David Sterba <firstname.lastname@example.org>
Diffstat (limited to 'fs/btrfs/ctree.h')
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 1c8f01eaf27c..aa1b437fb951 100644
@@ -57,9 +57,9 @@ struct btrfs_ref;
* filesystem data as well that can be used to read data in order to repair
* read errors on other disks.
- * Current value is derived from RAID1 with 2 copies.
+ * Current value is derived from RAID1C3 with 3 copies.
-#define BTRFS_MAX_MIRRORS (2 + 1)
+#define BTRFS_MAX_MIRRORS (3 + 1)
#define BTRFS_MAX_LEVEL 8