Re: [Rdo-list] live block migration on el7
[Added Eric Blake and Michal Privoznik of libvirt project, in case if
they have more to add or correct me.]
On Fri, Nov 14, 2014 at 11:40:18AM -0600, David Martin wrote:
We are running Havana on EL6, we rely pretty heavily on live storage
migrations setup like so:
block_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_NON_SHARED_INC,VIR_MIGRATE_LIVE
and it works great.
I am currently building a new stack based on EL7 and Juno, however when I
attempt to do a migration (nova live-migration --block-migrate x), i
receive the following:
libvirtError: internal error: unable to execute QEMU command 'migrate':
this feature or command is not currently supported
I've found a couple of related BZs:
https://bugzilla.redhat.com/show_bug.cgi?id=1022393
https://bugzilla.redhat.com/show_bug.cgi?id=1020495
Am I understanding this correctly that they have completely removed this
feature from RHEL7? Unless I'm running the RHEV variant of qemu-kvm??
AIUI, seems like your assessment is correct.
Reading the bugs, the summary is, in *EL6 the below QMP (QEMU Machine
Protocol) arguments to 'migrate' command
"blk": block migration, full disk copy
"inc": incremental disk copy
were inadvertantly introduced. However, all the live block operations
should work with: qemu-kvm-rhev (the variant you allude to, above).
If you'd like to rebuild them for *EL variant distributions, the SRPMs
should be available at http://ftp.redhat.com.
--
/kashyap