I read @SwisherSweet's question of the fastest and safest way to copy massive data from one external drive to another, along with @GrahamMiln's excellent answer.
I'm in a similar situation where I want to copy data from a Firewire 800 connected external hd to Drobo 5N, which is connected to the router that the iMac is connected to:
ExternalHd — iMac — Router — Drobo5N
I executed the command (
sudo rsync -vaE --progress /Volumes/SourceName /Volumes/DestinationName) and it works for some part, but on occasion I get the following error (I inserted some line breaks for better readability):
Boxx:~ Alex$ sudo rsync -vaE --progress /Volumes/ExternalHd/path/to/MyDirectory /Volumes/Drobo5N/path/to/ building file list ... 6 files to consider ._MyDirectory 1104 100% 0.00kB/s 0:00:00 (xfer#1, to-check=5/6) MyDirectory/._file1.dmg 1430 100% 34.06kB/s 0:00:00 (xfer#2, to-check=3/6) MyDirectory/._file2.dmg 1430 100% 27.38kB/s 0:00:00 (xfer#3, to-check=2/6) copyfile(.._MyDirectory.drJHX3,./MyDirectory, COPYFILE_UNPACK) failed:45 copyfile(MyDirectory/.._file1.dmg.PQTcsU,MyDirectory/file1.dmg, COPYFILE_UNPACK) failed:45 rsync: rename "/Volumes/Drobo5N/path/to/MyDirectory/.._file1.dmg.PQTcsU" -> "MyDirectory/._file1.dmg": No such file or directory (2) copyfile(MyDirectory/.._file2.dmg.gx7VTP,MyDirectory/file2.dmg, COPYFILE_UNPACK) failed:45 rsync: rename "/Volumes/Drobo5N/path/to/MyDirectory/.._file2.dmg.gx7VTP" -> "MyDirectory/._file2.dmg": No such file or directory (2) sent 4369 bytes received 86 bytes 8910.00 bytes/sec total size is 48176733 speedup is 10814.08 rsync error: some files could not be transferred (code 23) at /BuildRoot/Library/Caches/com.apple.xbs/Sources/rsync/rsync-47/rsync/main.c(992) [sender=2.6.9]
Why do I get these
I found the source code for copyfile.c, but could not find out what triggers the error. In there it says about COPYFILE_UNPACK:
COPYFILE_UNPACK is the undoing of COPYFILE_PACK, obviously. The goal there is to take an Apple Double file, and turn it into a normal file (with data fork, resource fork, modes, extended attributes, ACLs, etc.).
My error message says something about
COPYFILE_UNPACK, but what does it mean and how can I fix the error?
- Why does the
rsynccommand create the dot file like
rsynccompletes successfully I still see the dot file in the synced destination directory (/Volumes/Drobo5N/path/to/) in addition to the actual synced file. Why is that?
- Why does
rsynccreate extensions like
.drJHX3? Is that a temp name?
P.S.: Sorry if this has been asked elsewhere. I've search for this error using rsync, but couldn't surface any.