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btrfs-progs: docs: Add warning for build RAID btrfs on partions from the same device

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Quite a common sense for any RAID-like multi-device setup, just in case.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Qu Wenruo 2016-09-06 17:35:33 +02:00 committed by David Sterba
parent 53c4e289c2
commit f04db96f61
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Documentation/mkfs.btrfs.asciidoc
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@ -271,6 +271,10 @@ There are the following block group types available:
| RAID6 | 1 | 2 | 3 to N - 2 | 3/any ^(see note 3)^ | RAID6 | 1 | 2 | 3 to N - 2 | 3/any ^(see note 3)^
|============================================================= |=============================================================
WARNING: It's not recommended to build btrfs with RAID0/1/10/5/6 prfiles on
partitions from the same device. Neither redundancy nor performance will be
improved.
'Note 1:' DUP may exist on more than 1 device if it starts on a single device and 'Note 1:' DUP may exist on more than 1 device if it starts on a single device and
another one is added. Since version 4.5.1, *mkfs.btrfs* will let you create DUP another one is added. Since version 4.5.1, *mkfs.btrfs* will let you create DUP
on multiple devices. on multiple devices.