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| author | Paolo Bonzini <pbonzini@redhat.com> | 2013-01-21 17:09:46 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-01-25 18:18:34 +0100 |
| commit | eee13dfe302833944d1176677d12a6ea421a94ea (patch) | |
| tree | 53581a0a6c022df243eabdf32cf8e03232113c1c /qmp-commands.hx | |
| parent | 50717e941b9f306a45292621999eeafbaa954418 (diff) | |
| download | qemu-eee13dfe302833944d1176677d12a6ea421a94ea.zip qemu-eee13dfe302833944d1176677d12a6ea421a94ea.tar.gz qemu-eee13dfe302833944d1176677d12a6ea421a94ea.tar.bz2 | |
mirror: allow customizing the granularity
The desired granularity may be very different depending on the kind of
operation (e.g. continuous replication vs. collapse-to-raw) and whether
the VM is expected to perform lots of I/O while mirroring is in progress.
Allow the user to customize it, while providing a sane default so that
in general there will be no extra allocated space in the target compared
to the source.
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qmp-commands.hx')
| -rw-r--r-- | qmp-commands.hx | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/qmp-commands.hx b/qmp-commands.hx index cbf1280..835ea26 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -938,7 +938,8 @@ EQMP { .name = "drive-mirror", .args_type = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?," - "on-source-error:s?,on-target-error:s?", + "on-source-error:s?,on-target-error:s?," + "granularity:i?", .mhandler.cmd_new = qmp_marshal_input_drive_mirror, }, @@ -962,6 +963,7 @@ Arguments: file/device (NewImageMode, optional, default 'absolute-paths') - "speed": maximum speed of the streaming job, in bytes per second (json-int) +- "granularity": granularity of the dirty bitmap, in bytes (json-int, optional) - "sync": what parts of the disk image should be copied to the destination; possibilities include "full" for all the disk, "top" for only the sectors allocated in the topmost image, or "none" to only replicate new I/O @@ -971,6 +973,10 @@ Arguments: - "on-target-error": the action to take on an error on the target (BlockdevOnError, default 'report') +The default value of the granularity is the image cluster size clamped +between 4096 and 65536, if the image format defines one. If the format +does not define a cluster size, the default value of the granularity +is 65536. Example: |