On Fri, Apr 11, 2014 at 10:43:52AM +0800, Qu Wenruo wrote: > Add device management related paragraph to better explain btrfs device > management. > > Cc: Marc MERLIN <m...@merlins.org> > Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com> > --- > Documentation/btrfs-balance.txt | 3 +++ > Documentation/btrfs-device.txt | 42 > +++++++++++++++++++++++++++++++++++++++++ > Documentation/btrfs-replace.txt | 4 ++++ > 3 files changed, 49 insertions(+) > > diff --git a/Documentation/btrfs-balance.txt b/Documentation/btrfs-balance.txt > index 2289fdf..1b1861c 100644 > --- a/Documentation/btrfs-balance.txt > +++ b/Documentation/btrfs-balance.txt > @@ -14,6 +14,8 @@ DESCRIPTION > 'btrfs balance' is used to balance chunks in a btrfs filesystem across > multiple or even single device. > > +See `btrfs-device`(8) for more details about the effect on device management. > + > SUBCOMMAND > ---------- > <path>:: > @@ -75,3 +77,4 @@ further details. > SEE ALSO > -------- > `mkfs.btrfs`(8), > +`btrfs-device`(8) > diff --git a/Documentation/btrfs-device.txt b/Documentation/btrfs-device.txt > index 20d7bcd..474d411 100644 > --- a/Documentation/btrfs-device.txt > +++ b/Documentation/btrfs-device.txt > @@ -14,6 +14,46 @@ DESCRIPTION > 'btrfs device' is used to control the btrfs devices, since btrfs can be used > across several devices, 'btrfs device' is used for multiple device > management. > > +DEVICE MANAGEMENT > +----------------- > +Btrfs filesystem is capable to manage multiple devices. > + > +Btrfs filesystem use different profiles to manage different RAID level, and > +use balance to rebuild chunks, also devices can be added/removed/replace > +online.
s/use/uses/g > + > +Profile:: > +Btrfs filesystem use data/metadata profiles to manage allocation/duplication > +mechanism. Profiles like RAID level can be assigned to data and metadata > separately. ditto. Good update. -liubo > ++ > +See `mkfs.btrfs`(8) for more details. > + > +RAID level:: > +Btrfs filesystem supports most of the standard RAID level: 0/1/5/6/10. > +RAID levels can be assigned at mkfs time or online. > ++ > +See `mkfs.btrfs`(8) for mkfs time RAID level assign and `btrfs-balance`(8) > for > +online RAID level assign. > + > +Balance:: > +`btrfs-balance`(8) subcommand can be used to balance or rebuild chunks to the > +desired profile. > ++ > +Due to the fact that balance can rebuild/recovery chunks according to its > RAID > +duplication if possible, so when using RAID1/5/6/10 with some devices failed > +and you just added a new device to btrfs using `btrfs-device`(8), you should > +run `btrfs-balance`(8) to rebuild the chunks. > ++ > +See `btrfs-balance`(8) for more details. > + > +Device add/remove/replace:: > +Device can be added/removed using `btrfs-replace`(8) subcommand and replaced > +using `btrfs-replace`(8). > ++ > +When device is removed or replaced, btrfs will do the chunk rebuild if > needed. > ++ > +See `btrfs-replace`(8) and this man page for more details. > + > SUBCOMMAND > ---------- > 'add' [-Kf] <dev> [<dev>...] <path>:: > @@ -73,3 +113,5 @@ further details. > SEE ALSO > -------- > `mkfs.btrfs`(8), > +`btrfs-replace`(8), > +`btrfs-balance`(8) > diff --git a/Documentation/btrfs-replace.txt b/Documentation/btrfs-replace.txt > index 8c5dcc4..15a46c2 100644 > --- a/Documentation/btrfs-replace.txt > +++ b/Documentation/btrfs-replace.txt > @@ -13,6 +13,9 @@ DESCRIPTION > ----------- > 'btrfs replace' is used to replace btrfs managed devices with other device. > > +It is recommended to see `btrfs-device`(8) for more details about btrfs > device > +management. > + > SUBCOMMAND > ---------- > 'start' [-Bfr] <srcdev>|<devid> <targetdev> <path>:: > @@ -74,3 +77,4 @@ further details. > SEE ALSO > -------- > `mkfs.btrfs`(8), > +`btrfs-device`(8), > -- > 1.9.2 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
