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This is a way for you to verify that you have the exact same file as OP, and nobody has modified it in any way.Ī (good) hashing algorithm doesn't guarantee anything, it just gives you a high probability that you have the same file. MD5 is a fast hashing algorithm so it is more vulnerable to certain types of attack than a slow one, but you can't take a hash and algorithmically determine what input produced it.īUT an MD5 hash of a file is just a unique signature for that file. MD5 is not a secure hashing algorithm and is easily reversed.Ī hash cannot be reversed. Increase the folder size to say 6TB and 15,000,000 files/folders, you'll definitely see the differences. So 6 minutes quicker with EMCopy, with the same attributes being copied, same number of threads, and permissions. Security Descriptor Setting(s) done: : 63477Īmount of copied byte(s) : 30 GB (32 730 088 649 Byte(s)) Log file : /log:t:\emcopy_test_same_thread.log Total Copied Skipped Mismatch FAILED Extras Let me state that should not be a bench mark, many factors can change the outcome of these tests, but I ran the tests on the same system, and with the same processes running both times. Here is a test I did, just for this post, EMCopy vs.
EMCOPY COMMAND WINDOWS
RoboCopy does support 128 threads on new versions of Windows 2008R2 and above.
![emcopy command emcopy command](https://docplayer.net/docs-images/40/15194427/images/page_14.jpg)
Multithreading: EMCopy supports up to 256 threads.I'll just give you a few quick points of what works better with EMCopy.
EMCOPY COMMAND FREE
It is a free data migration tool, CLI only, and has a lot of features that just seem to work better than RoboCopy.
EMCOPY COMMAND TRIAL
What I have found on a long quest of trial and error is a utility called "EMCopy" from EMC. However, I've gotten to the point where RoboCopy is just not fast enough. This is my first time to try and do a migration from one domain to another which is the likely cause of these issues.ĭoes anyone else have experience in this area that can possibly share some wisdom or good advice? Much appreciated.First off, I love RoboCopy, I've used it for over a decade now, and I have no issues with it. In the past I have done many migrations using Robocopy with no issues whatsoever but these were all within the same domain. I tried using EMCopy (v4.17) by EMC but with similar results with"ĮRROR 1307" and " Unable to set SD" for some files and folders. This, in some cases, also affects the NTFS permissions of subfolders and files. So it will not copy over the owner of the source directory files and folders. This security ID may not be assigned as the owner of this object." COPYALL or /DATSOU (essentially the same command) it results in the below: "ERROR 1307 (0x0000051B) Copying NTFS Security to Destination Directory D:\TEST\TEST_MIGRATION When I perform the migration the data migrates but some of the permissions appear strange in the subfolders and the account that runs the job also becomes the owner of the destination folders (This must be because I am not using the "O" switch.Īlso when I run the job using either of the below: I have been testing with Robocopy with the below switches: Robocopy.exe %source% %destination% /Z /COPY:DATS /E /R:10 /W1 /V /UNILOG+ logfilepath /UNICODE /TEE
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The destination domain trusts the source domain and the account being used to perform the data migration (source domain Administrator account) also has administrator permissions I am attempting to migrate data from one domain to another domain (separate forest).