On 10/11/2010 11:18, sridhar surampudi wrote:
I was wondering how zpool split works or implemented.
If a pool pool1 is on a mirror having two devices dev1 and dev2 then using
zpool split I can split with the new pool name say pool-mirror on dev2.
How split can change metadata on dev2 and rename/replace and associate with new
name i.e. pool-mirror ??
Exactly what isn't clear from the description in the man page ?
zpool split [-R altroot] [-n] [-o mntopts] [-o
property=value] pool newpool [device ...]
Splits off one disk from each mirrored top-level vdev in
a pool and creates a new pool from the split-off disks.
The original pool must be made up of one or more mirrors
and must not be in the process of resilvering. The split
subcommand chooses the last device in each mirror vdev
unless overridden by a device specification on the com-
mand line.
When using a device argument, split includes the speci-
fied device(s) in a new pool and, should any devices
remain unspecified, assigns the last device in each mir-
ror vdev to that pool, as it does normally. If you are
uncertain about the outcome of a split command, use the
-n ("dry-run") option to ensure your command will have
the effect you intend.
Or are you really asking about the implementation details ? If you want
to know how it is implemented then you need to read the source code.
Here would be a good starting point:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libzfs/common/libzfs_pool.c#zpool_vdev_split
Which ends up in kernel here:
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/zfs_ioctl.c#zfs_ioc_vdev_split
--
Darren J Moffat
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