On Mon, Sep 30, 2024 at 03:29:35PM +0200, Peter Krempa wrote: > Expose the new parameter as '--migrate-disks-detect-zeroes' option. > > Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx> > --- > docs/manpages/virsh.rst | 8 +++++++- > tools/virsh-domain.c | 26 ++++++++++++++++++++++++++ > 2 files changed, 33 insertions(+), 1 deletion(-) > > diff --git a/docs/manpages/virsh.rst b/docs/manpages/virsh.rst > index f02a28156d..6665d46497 100644 > --- a/docs/manpages/virsh.rst > +++ b/docs/manpages/virsh.rst > @@ -3389,7 +3389,9 @@ migrate > [--postcopy-after-precopy] [--postcopy-resume] [--zerocopy] > domain desturi [migrateuri] [graphicsuri] [listen-address] [dname] > [--timeout seconds [--timeout-suspend | --timeout-postcopy]] > - [--xml file] [--migrate-disks disk-list] [--disks-port port] > + [--xml file] > + [--migrate-disks disk-list] [--migrate-disks-detect-zeroes disk-list] > + [--disks-port port] > [--compressed] [--comp-methods method-list] > [--comp-mt-level] [--comp-mt-threads] [--comp-mt-dthreads] > [--comp-xbzrle-cache] [--comp-zlib-level] [--comp-zstd-level] > @@ -3420,6 +3422,10 @@ images on source host to the images found at the same place on the destination > host. By default only non-shared non-readonly images are transferred. Use > *--migrate-disks* to explicitly specify a list of disk targets to > transfer via the comma separated ``disk-list`` argument. > +The *--migrate-disks-detect-zeroes* option which takes a comma separated list of > +disk target names enables zeroed block detection for the listed migrated disks. How about this wording: Use *--migrate-disks-detect-zeroes* to specify which disks from *--migrate-disks* list of disks should have zeroed block detection enabled via the comma separated ``disk-list`` argument. > +These blocks are not transferred or allocated on destination, effectively > +sparsifying the disk at the cost of CPU overhead. > With *--copy-storage-synchronous-writes* flag used the disk data migration will > synchronously handle guest disk writes to both the original source and the > destination to ensure that the disk migration converges at the price of possibly Pavel
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