Ping On Wed, Nov 30, 2016 at 3:13 PM, Shahar Havivi <shav...@redhat.com> wrote:
> Hi, > > I am using virStorageVolGetInfo to get the volume size > virStorageVol.download to download a > normal file for VDSM project. > > I want to add support for block devices as well, I was able to see the size > via virDomainBlockInfo and download via virDomain.blockPeek which is works > fine for both file and block device. > > 1. Can I depend on virDomainBlockInfo for non block devices? > 2. Does the virDomainBlockInfo return the correct physical size for normal > file? > 3. Performance wise do we have a difference between virStorageVol.download > and virDomain.blockPeek? > > > Assuming the VMs are down, this is the code I intend to use for all > formats: > > vm = con.lookupByName(options.vmname) > info = vm.blockInfo(src) > physical = info[2] > > off = 0 > size = 0 > with open(dest, 'w+') as f: > while off < physical: > if (physical - off) < bufsize: > size = physical - off > else: > size = bufsize > buf = vm.blockPeek(src, off, size) > f.write(buf) > off += size >
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