Re: [Libguestfs] [PATCH libnbd] copy: Implement destination preferred block size
On Sun, Jan 30, 2022 at 12:27:53AM +0200, Nir Soffer wrote:
On Fri, Jan 28, 2022 at 10:39 PM Richard W.M. Jones
<rjones(a)redhat.com> wrote:
Doing read-modify-write in nbdcopy sounds like a bad idea. This is best done
closer to the storage, avoiding reading blocks from qemu-nbd to nbdcopy just
to write them back.
We don't have to read from the storage. The read-modify-write only
has to be done in memory inside nbdcopy because on the destination
side we're only writing.
Having said that, it turns out to be a little bit more complicated
than I described in the paragraph above :-(
Rich.
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