Understanding Pacer behavior with Google Drive

gdrive can be very slow, as we discussed here

based on forum posts, this has become common values to use, so might try
--drive-pacer-min-sleep=10ms --drive-pacer-burst=200

perhaps someone more experienced with gdrive, can offer some tweaks to your command.

by way of comparison, syncing 100,00 files, using wasabi, s3 clone, known for hot storage

2022/03/17 11:13:13 DEBUG : rclone: Version "v1.57.0" starting with parameters ["C:\\data\\rclone\\rclone.exe" "sync" "D:\\files\\100000" "wasabi01:test100000" "--transfers=256" "--checkers=256" "--fast-list" "--progress" "--stats-one-line" "--log-level=DEBUG" "--log-file=C:\\data\\rclone\\rr\\other\\newtest\\100000\\log.txt" "--dry-run"]
2022/03/17 11:13:13 DEBUG : Creating backend with remote "D:\\files\\100000"
2022/03/17 11:13:13 DEBUG : Using config file from "C:\\data\\rclone\\rclone.conf"
2022/03/17 11:13:13 DEBUG : fs cache: renaming cache item "D:\\files\\100000" to be canonical "//?/D:/files/100000"
2022/03/17 11:13:13 DEBUG : Creating backend with remote "wasabi01:test100000"
2022/03/17 11:13:49 DEBUG : 7967 go routines active

An hour to check 240,000 files sounds very slow, if you already synced everything once before and have fast server with a fast low latency internet connection. I can check 50,000 files in less than 2 minutes.

Has (almost) everything been synced before? What is your latency? What is your internet speed? How many folders do you have? How deep is your folder structure?

Note, that --fast-list isn’t always the fastest way to complete a sync: https://rclone.org/docs/#fast-list

It heavily depends on the characteristics of your data, my Google Drive syncs are faster without --fast-list

Did you try without --fast-list before adding it? How much did --fast-list improve your speed?

The log snippet in your picture looks odd, it seems like something is missing, perhaps it has been filtered/grepped?

Please post a full (unfiltered) log in text format if you would like us to take a look at your issue.

Tip: You may want to use --log-file=mylogfile.txt

It's hard to re-execute these because it takes so long for it to finish. I'm an hour and 30minutes in and the -vv output is just displaying what I have screenshot. I'll need to wait for it to finish before I can add the --log-file file.

Every now and then it says this:

but then it just keeps going, with no additional details.

Gigabit line, Dell r720.

Everything has synced as far as I can tell. I started using --fast-list after the initial sync after reading it would increase performance where there where a huge number of directories.

I decided to cut the current process and start it again with out --fast-list and now it's actually displaying file names and displaying comparison information, whereas before with --fast-list all it said was what is in the screenshot (I solemnly swear)

Edit: Folder Count is 109,000

Edit: It's been 5 minutes and we are on the C's out of of about 400 parent folders A-Z with a fairly even distribution. A this rate it will still take an hour+. On the bright side there's actual feedback now.

Edit: Current Check rate out of 240k:

Transferred:   	          0 B / 0 B, -, 0 B/s, ETA -
Checks:              1804 / 1804, 100%
Elapsed time:       1m0.1s


Ahh, this probably explains.

Google Drive seems to have a limit on the number of directory listings you can make per second.

I have roughly 3,000 folders that I can check in a little less than 2 minutes. Your 109,000 folders would then take roughly 1 hour if checked at the same rate (ignoring differences in number of files etc.)

This and other similar limits are typical for cloud storage having a fixed price per GB such as Google Drive, OneDrive, Dropbox, … The (relatively) low price per GB comes with a (somewhat hidden) limitation on your check and update speeds.

I use these Google Drive tuning parameters: --checkers=16 --drive-pacer-min-sleep=10ms in my syncs.

I suggest you try them individually and together; they may improve your speed somewhat (but don’t expect miracles).

(no modifiers no fastlist)


Transferred:   	  234.315 KiB / 234.315 KiB, 100%, 6.326 KiB/s, ETA 0s
Checks:              8967 / 8967, 100%
Transferred:            6 / 6, 100%
Elapsed time:       1m0.1s

With your --checkers=16 --drive-pacer-min-sleep=10ms mods. x4.97 increase in the first minute.

hi, this is what i had suggested, did you try both values?

and about that last run, there were two errors.
it could be that rclone sync will try the entire sync for each error.
need to look into the debug log for retries

Sorry was going to try that but wanted to figure out how long it takes without the --fast-list modifier so I could have reference point. It took 5.5 hours.

Adding the mods that @Ole mentioned it's now working at 5x increased speed. I will then add your suggested modifier so I have a good spread. Thanks your help!

yeah, that is what i always do, one flag at a time, learn much more that way.

1 Like

sorry to double post, but I would like to additionally report that there appear to be no more pacer mentions after enacting @ole's suggested modifiers. They're completely gone, but it's still trucking away.

Transferred:   	    2.988 MiB / 2.988 MiB, 100%, 594 B/s, ETA 0s
Errors:                 1 (retrying may help)
Checks:            184993 / 184993, 100%
Transferred:           17 / 17, 100%
Elapsed time:      15m0.1s

Edit: Quotas



Errors:                 2 (retrying may help)
Checks:            723322 / 723322, 100%
Transferred:           17 / 17, 100%
Elapsed time:     51m24.1s

from 5.5 hours to 51 minutes. Interestingly the check count has shot up significantly. No idea why.

Adding burst flag next.

240,000 files X (Errors: 2 + 1) = 720,000

@asdffdsa Spot on, I agree!

@phatmandrake Try searching/filtering/grepping your log file for "ERROR :" then you will see the name of the troubling file, the error message and 3 times "ERROR : Attempt x/3 failed with ...".

The 3 attempts correspond to the default value of --retries.

Adding --drive-pacer-burst=200 had no noticeable affect.

Transferred:   	          0 B / 0 B, -, 0 B/s, ETA -
Errors:                 2 (retrying may help)
Checks:            723339 / 723339, 100%
Elapsed time:     53m58.3s

2022/03/17 20:41:41 DEBUG : 34 go routines active
2022/03/17 20:41:41 Failed to sync with 2 errors: last error was: directory not found


ERROR : <SNIP> error reading source directory: directory not found
ERROR : <SNIP> Failed to copy: failed to open source object: Access is denied. 
2022/03/17 20:41:41 DEBUG : Google drive root '': Waiting for checks to finish
2022/03/17 20:41:41 DEBUG : Google drive root '': Waiting for transfers to finish
2022/03/17 20:41:41 ERROR : Google drive root '': not deleting files as there were IO errors
2022/03/17 20:41:41 ERROR : Google drive root '': not deleting directories as there were IO errors
2022/03/17 20:41:41 ERROR : Attempt 3/3 failed with 2 errors and: failed to open source object: Access is denied.

It does look like it attempts a full sync at least 2 times because of these errors. What do I do about that :sweat_smile:

Start Time: 19:47:42
First Retry: 20:05:44

Based on this it finished in 18 minutes, which is a lot better.

Edit: Honestly based off the quota information I'm nowhere near the max queries per 100 second maybe I can up the checkers :eyes: ??

Glad to hear :smile:

Seems to be an issue with your access rights to a local directory/folder. I assume you know the name and have redacted your post.

You basically have two options:

  1. give yourself the necessary access rights
  2. exclude the folder from the sync by adding --exclude=”your/folder/**”

Ad 2) you can test your filter with rclone lsl. Please consider a --dry-run when adding/changing the filter to your sync.

The quota only shows your limit on requests in general, there are also other (hidden) limits such as the number of directory listings you can do per second (which is considerably lower).

So yes perhaps, you may get better results with --checkers=32, but not necessarily it may also cause Google to throttle and thereby lower your speed. It is a delicate balance. I suggest you test and trim in small steps when we have fixed the above error message.

I can't statically exclude any directories unfortunately. Is there a way to tell rclone to just ignore any errors and continue with all operations anyway? I'd rather something be missing than for it to not delete any files or directories because 1 or 2 are inaccesible during a sync. There are dozens of people working on the directory tree at any point in time so access errors are bound to happen periodically.

You could use --retries=1, but be carefully you probably want to get notified if it suddenly contains 100,000 errors - or a fatal connection error :scream:

I have a script that checks the rclone exit code and scans the log file and then sends me a mail in case of (unexpected) errors.

Edit: One drawback of --retries=1 is that the sync will not delete files on the target if there are any errors

How is that any different from what it's doing now. Based on the log: It makes it sound like it's already not deleting anything.

2022/03/17 20:41:41 ERROR : Google drive root '': not deleting files as there were IO errors
2022/03/17 20:41:41 ERROR : Google drive root '': not deleting directories as there were IO errors

Well, it depends on the probabilities of clean run.

If chances are close to 0% of a successful attempt then there is no difference, if it is 50% then 3 attempts in a row will theoretically give you a 87.5% chance of success.

Thus far the errors are based on a permission issue, which will occur periodically and for ever retry until resolved (The user that I'm syncing as has full admin access, but NTFS permissions can get messed up to the point even an admin can't touch the file until permissions are restored). I'm really concerned about why RClone decides that no files can be deleted if it has issue with just one :thinking:

If I embed RClone into a script I can probably come up with a way of resolving a permission error and maybe doing a targeted sync on the single failure.

So to clarify there is no way to get rclone to delete all files except for ones related to the one it says it's having issues with? just trying to understand that behavior.

rclone plays it safe, if there are errors in the sync, then do not delete files.

imho, fwiw, at this point, take a few minutes, to scan the commands and flags, so you can know what is possible and perhaps answer some of your own questions.

might try --ignore-errors or tweak https://rclone.org/docs/#delete-before-during-after