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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