What is 'ftp1old' ?

In FTP status now appeared the 'ftp1old' - what is that?

ftp
Number of files queued: 13
ftp1old
Number of files queued: 0
ftp2
Number of files queued: 8
ftp3
Number of files queued: 110

Zygis

ftp1 got a hefty queue so we started another instance so it would get a chance to breathe. So you can follow the progress of the old ftp1 we added an entry for that one too.

thanks, Marcus!