diff options
Diffstat (limited to 'Documentation/mkfs.btrfs.asciidoc')
| -rw-r--r-- | Documentation/mkfs.btrfs.asciidoc | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/mkfs.btrfs.asciidoc b/Documentation/mkfs.btrfs.asciidoc index 6a492658..e4321de9 100644 --- a/Documentation/mkfs.btrfs.asciidoc +++ b/Documentation/mkfs.btrfs.asciidoc @@ -230,7 +230,7 @@ Other terms commonly used: *block group*:: *chunk*:: a logical range of space of a given profile, stores data, metadata or both; -sometimes the terms are used interchangably +sometimes the terms are used interchangeably + A typical size of metadata block group is 256MiB (filesystem smaller than 50GiB) and 1GiB (larger than 50GiB), for data it's 1GiB. The system block group @@ -254,7 +254,7 @@ There are the following block group types available: .2+^.<h| Profile 3+^.^h| Redundancy .2+^.<h| Min/max devices ^.^h| Copies ^.^h| Parity ^.<h| Striping | single | 1 | | | 1/any -| DUP | 2 / 1 device | | | 1/1 ^(see note)^ +| DUP | 2 / 1 device | | | 1/any ^(see note)^ | RAID0 | | | 1 to N | 2/any | RAID1 | 2 | | | 2/any | RAID10 | 2 | | 1 to N | 4/any @@ -263,8 +263,8 @@ There are the following block group types available: |============================================================= 'Note:' DUP may exist on more than 1 device if it starts on a single device and -another one is added, but *mkfs.btrfs* will not let you create DUP on multiple -devices. +another one is added. Since version 4.5.1, *mkfs.btrfs* will let you create DUP +on multiple devices. DUP PROFILES ON A SINGLE DEVICE ------------------------------- @@ -274,7 +274,7 @@ the logical blocks to 2 physical locations. Whether there are really 2 physical copies highly depends on the underlying device type. For example, a SSD drive can remap the blocks internally to a single copy thus -deduplicating them. This negates the purpose of increased redunancy and just +deduplicating them. This negates the purpose of increased redundancy and just wastes space. The duplicated data/metadata may still be useful to statistically improve the |