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Why would dd have a limit on the amount of data it can copy, afaik dd doesn't check not does anything fancy, if it can copy one bit it can copy infinite.
Even if it did any sort of validation, if it can do anything larger than RAM it needs to be able to do it in chunks.
Not looking at the man page, but I expect you can limit it if you want and the parser for the parameter knows about these names. If it were me it'd be one parser for byte size values and it'd work for chunk size and limit and sync interval and whatever else dd does.
Also probably limited by the size of the number tracking. I think dd reports the number of bytes copied at the end even in unlimited mode.
It’s less about dd’s limits and more laughs the fact that it supports units that might take decades or more for us to read a unit that size.
Well they do nickname it disk destroyer, so if it was unlimited and someone messed it up, it could delete the entire simulation that we live in. So its for our own good really.
I recently copied ~1.6T from my old file server to my new one. I think that may be my largest non-work related transfer.
20TB (out of 21TB usable), a second 6x6TB zfs raidz2 server as my send target.
While I haven't personally had to move a data center I imagine that would be a pretty big transfer. Probably not dd though.
I can't imagine how nerve-wracking it would be to run dd on something like that lol. I still don't trust myself to copy a USB stick with my unimportant bullshit on it with dd, let alone a server with anything important on it!
I think it would be my whole broken manjaro install, I just used dd to make a copy so I could work on it later lol. About 500 gigs
Probably some vigeo game on that is ~150-200 GiB. Does that count?