No timeline for a fix, however-or even a commitment to modify the Drobo’s SMB configuration. I’ve been in contact with Drobo customer support and they acknowledge this pathological behavior. (No matter what file-copy tool is used this is not an rsync problem.) So the while the content of the files will be unaltered when you make a round trip between a Mac and a Drobo, the file permissions in most cases will not be correct when you move the file back to the Mac. Unlike other Linux-based servers, the Drobo 5N’s SMB configuration automatically and quite nonsensically modifies the permission bits on files transferred from an OS X filesystem. Drobo’s implementation of the SMB protocol is, to put it as charitably as possible, nonstandard. There is one endemic problem keeping files synchronized between a Mac and a Drobo. ![]() You’ll need to be comfortable with command-line tools to use it, however. Rsync (part of the free Apple Xcode developer’s bundle for OS X) is quite reliable and has features to maximize file synchronization efficiency. I have a large lightroom library on my mac that will change often - and so far syncing from the mac seems painfully slow - often times it will hang.
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