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[Qemu-devel] [PATCH v3 0/8] Mirrored block writes
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v3 0/8] Mirrored block writes |
Date: |
Mon, 5 Mar 2012 18:33:54 +0100 |
v3 comes with a new QMP command drive-mirror, an improved
blockdev-snapshot-sync that just reuses transaction functionality, and
a new image creation mode enum. I also tested that the command can be
used to migrate without shared storage.
Tested with the following scenarios:
a) mirror only
1) create base.qcow2 and starat QEMU with it
2) Execute the following QMP command
{ "execute": "qmp_capabilities" }
{ "execute": "transaction", "arguments":
{'actions': [
{ 'type': 'drive-mirror', 'data' :
{ 'device': 'ide0-hd0', 'target': '/home/pbonzini/mirror.qcow2' } } ] } }
{ "execute": "cont" }
3) hibernate the guest (this requires an IDE disk and -cpu kvm64,-kvmclock)
4) restart the guest with mirror.qcow2
b) Same as (a) with drive-mirror command.
c) streaming to new image
1) start QEMU with an existing image test.img
2) execute the following HMP commands
drive_mirror -s ide0-hd0 /home/pbonzini/mirror.qed qed
block_stream ide0-hd0
3) shut down the guest (sorry, this took a looong time and I forgot to
hibernate here)
4) move away the base image
5) restart the guest with mirror.qed
d) atomic snapshot+mirror (QMP only):
1) start QEMU with an existing image test.img
2) Execute the following QMP command
{ "execute": "qmp_capabilities" }
{ "execute": "transaction", "arguments":
{'actions': [
{ 'type': 'blockdev-snapshot-sync', 'data' :
{ 'device': 'ide0-hd0', 'snapshot-file': '/home/pbonzini/base.qcow2' } },
{ 'type': 'drive-mirror', 'data' :
{ 'device': 'ide0-hd0', 'target': '/home/pbonzini/mirror.qcow2' } } ] } }
{ "execute": "cont" }
3) hibernate the guest (this requires an IDE disk and -cpu kvm64,-kvmclock)
4) check that mirror.qcow2 has test.img as the base
5) restart the guest with base.qcow2
6) restart the guest with mirror.qcow2
v2->v3:
replace reuse argument with NewImageMode enum and mode argument;
renamed all commands and actions; implemented blockdev-snapshot-sync
in terms of group snasphots; added new drive-mirror command and
HMP equivalent.
Marcelo Tosatti (1):
Add blkmirror block driver
Paolo Bonzini (7):
fix format name for backing file
qapi: complete implementation of unions
rename blockdev-group-snapshot-sync
add mode field to blockdev-snapshot-sync transaction item
qmp: convert blockdev-snapshot-sync to a wrapper around transactions
add mirroring to transaction
add drive-mirror command and HMP equivalent
Makefile.objs | 2 +-
block/blkmirror.c | 239 +++++++++++++++++++++++++++++++++++++++++++++
blockdev.c | 232 ++++++++++++++++++++++++-------------------
hmp-commands.hx | 31 +++++-
hmp.c | 34 ++++++-
hmp.h | 1 +
qapi-schema-test.json | 10 ++
qapi-schema.json | 119 ++++++++++++++++++----
qmp-commands.hx | 105 +++++++++++++++-----
scripts/qapi-types.py | 5 +
scripts/qapi-visit.py | 31 ++++++-
test-qmp-input-visitor.c | 18 ++++
test-qmp-output-visitor.c | 34 +++++++
13 files changed, 707 insertions(+), 154 deletions(-)
create mode 100644 block/blkmirror.c
--
1.7.7.6
[Qemu-devel] [PATCH v3 3/8] rename blockdev-group-snapshot-sync, Paolo Bonzini, 2012/03/05
[Qemu-devel] [PATCH v3 5/8] qmp: convert blockdev-snapshot-sync to a wrapper around transactions, Paolo Bonzini, 2012/03/05