Media Management doesn't show correct time remaining

I'm doing a large media consolidation on a feature edit. DVR 15.1 on a iMacPro. Media is Arriraw, spread over 8 drives all connected. Sequence was imported from an Avid AAF, and media clips imported separately into the Media Pool before importing AAF.

To be safe I'm doing portions of about 20 mins of the hour long timelines at a time. I select a range of clips, go to media management. and choose to copy with 24 frame handles and output set to a folder on another drive (6-bay LaCie Thunderbolt 3 RAID5).
As the screenshot shows, towards the end of the consolidate, the time remaining is very large, and percentage too, some ridiculous number. The consolidate turns out fine, and I've done this for an entire feature with no errors.

Not sure if this is with Arriraw media (.ari file sequences) or does this happen to other kinds of media too.

I've also noticed that the File > Media Management gets graded out, unless one has the Media Pool panel open in the Edit page, and a sequence is selected.

Arriraw cons rem time error.png (235.42 KiB) Viewed 913 times

Yeah, the time problem is kind of the way it is.

One issue (my opinion only) is that the operating system doesn't always accurately report how much time it will take to copy from drive A to drive B. I'm sure you've had that issue where you start copying files, it says "30 minutes remaining," and then 20 minutes later it says "15 minutes remaining," which makes no sense. There are logical reasons why it's difficult to estimate how long it will take to copy X number of files, based on hard drive speed, what else is going on in the background, how the drive reacts as it fills up, and so on. And many, many times in Windows (not so much in Mac OSX), I'll do a copy or a process and it gets to 99%... and then sits there for 5-10 minutes as if it's crashed, and then it finally gets to 100% and everything's fine. (This is outside of Resolve.)

I think there are similar factors involved with Media Management. Me personally, I wish Media Management could do three significant things:

1) better error handling when a file is missing or there's a momentary failure. It should just compile a list and then give you a message that says, "X files were copied, Y errors were encountered" and present you with the list. Instead, this problem generally aborts Media Management entirely.

2) more accurate destination sizing. I've seen it initially report you're going to need 2TB, and it winds up taking 2.5TB or even 3TB, which is a big discrepancy. (I get that this is a moving target and not that easy to do.)

and 3) the time estimation problem. I have not seen the bizarre "percentage problem" you show, but that looks like a very real bug that should be fixable.

For consolidating footage from an edit timeline in Resolve, I've used Resolve Collect in the past and that used to work too. If I remember correctly, RC even gave you the option of skipping existing files.