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Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release |
Date: |
Wed, 15 Aug 2012 13:38:06 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Aug 15, 2012 at 10:12:42AM +0200, Ruben Kerkhof wrote:
> On Tue, Aug 14, 2012 at 4:42 PM, Stefan Hajnoczi
> <address@hidden> wrote:
> > On Tue, Aug 14, 2012 at 08:32:31AM -0500, Anthony Liguori wrote:
> >> To be replaced with live block copy.
> >>
> >> Signed-off-by: Anthony Liguori <address@hidden>
> >> ---
> >> migration.c | 9 +++++++++
> >> 1 files changed, 9 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/migration.c b/migration.c
> >> index 653a3c1..babccf4 100644
> >> --- a/migration.c
> >> +++ b/migration.c
> >> @@ -482,10 +482,19 @@ void qmp_migrate(const char *uri, bool has_blk, bool
> >> blk,
> >> MigrationParams params;
> >> const char *p;
> >> int ret;
> >> + static bool suppress_deprecation_message;
> >>
> >> params.blk = blk;
> >> params.shared = inc;
> >>
> >> + if (blk && !suppress_deprecation_message) {
> >> + qerror_report(ERROR_CLASS_GENERIC_ERROR,
> >
> > qerror_report_once() would be nice :).
> >
> >> + "Block migration is deprecated. "
> >> + "See http://wiki.qemu.org/Features/LiveBlockCopy "
> >
> > The page doesn't exist, I think it should be:
> > http://wiki.qemu.org/Features/LiveBlockMigration
>
> Can the new live block copy method still use tcp just like the current
> block migration? The wiki page only mentions iscsi.
> I make extensive use of block migration over tcp, which works fine and
> is handled by libvirt. I'd rather not introduce iscsi in my
> environment.
The new live block copy approach is different and that's why classic
block migration is only deprecated but not dropped:
Live block copy doesn't transfer data in-band during live migration.
Instead it currently requires storage access from both hosts, for
example:
1. NFS or CIFS
2. iSCSI or NBD
I think when classic block migration is removed for good it should be
just as easy to use through libvirt using TCP because that's still a
valid use case and probably the simplest one to get started. (Libvirt
could orchestrate an NBD connection behind the scenes, for example.)
Stefan
Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Stefan Hajnoczi, 2012/08/14
- Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Ruben Kerkhof, 2012/08/15
- Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Ruben Kerkhof, 2012/08/16
- Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Paolo Bonzini, 2012/08/18
- Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Ruben Kerkhof, 2012/08/19
- Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Paolo Bonzini, 2012/08/20
- Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Ruben Kerkhof, 2012/08/20
Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Paolo Bonzini, 2012/08/18
Re: [Qemu-devel] [PATCH] block-migration: deprecate block migration for the 1.2 release, Luiz Capitulino, 2012/08/14