diff options
| author | Peter Lieven <pl@kamp.de> | 2013-07-18 09:48:50 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-07-19 12:29:21 +0800 |
| commit | 323004a39d4d8d33c744a5b108f80bfe6402fca3 (patch) | |
| tree | e232d3657f529de5ac35cd785fa6fa387ab90116 /qapi-schema.json | |
| parent | 8bf9344ad6883e6d85b69bab36d9d76e4257e9ed (diff) | |
block-migration: efficiently encode zero blocks
this patch adds a efficient encoding for zero blocks by
adding a new flag indicating a block is completely zero.
additionally bdrv_write_zeros() is used at the destination
to efficiently write these zeroes. depending on the implementation
this avoids that the destination target gets fully provisioned.
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'qapi-schema.json')
| -rw-r--r-- | qapi-schema.json | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/qapi-schema.json b/qapi-schema.json index 8d33d527d3..592bb9c7a1 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -613,10 +613,16 @@ # Disabled by default. Experimental: may (or may not) be renamed after # further testing is complete. (since 1.6) # +# @zero-blocks: During storage migration encode blocks of zeroes efficiently. This +# essentially saves 1MB of zeroes per block on the wire. Enabling requires +# source and target VM to support this feature. To enable it is sufficient +# to enable the capability on the source VM. The feature is disabled by +# default. (since 1.6) +# # Since: 1.2 ## { 'enum': 'MigrationCapability', - 'data': ['xbzrle', 'x-rdma-pin-all', 'auto-converge'] } + 'data': ['xbzrle', 'x-rdma-pin-all', 'auto-converge', 'zero-blocks'] } ## # @MigrationCapabilityStatus |