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mirror: add support for on-source-error/on-target-error

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Error management is important for mirroring; otherwise, an error on the
target (even something as "innocent" as ENOSPC) requires to start again
with a full copy.  Similar to on_read_error/on_write_error, two separate
knobs are provided for on_source_error (reads) and on_target_error (writes).
The default is 'report' for both.

The 'ignore' policy will leave the sector dirty, so that it will be
retried later.  Thus, it will not cause corruption.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-10-18 16:49:28 +02:00 • committed by Kevin Wolf
parent 3bd293c3fd
commit b952b5589a
6 changed files with 107 additions and 25 deletions
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8
qmp-commands.hx
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@ -937,7 +937,8 @@ EQMP
{
.name = "drive-mirror",
.args_type = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?",
.args_type = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?,"
"on-source-error:s?,on-target-error:s?",
.mhandler.cmd_new = qmp_marshal_input_drive_mirror,
},
@ -965,6 +966,11 @@ Arguments:
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
(MirrorSyncMode).
- "on-source-error": the action to take on an error on the source
(BlockdevOnError, default 'report')
- "on-target-error": the action to take on an error on the target
(BlockdevOnError, default 'report')
Example: