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stanleywong
Joined: 14 Nov 2007
Posts: 3
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 Posted: Wed Nov 14, 2007 6:33 pm Post subject: Speed up the comparison |
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After the "initial" syncronise (A -->B) (each 500 GB harddisk), everytime when I add or delete the files from A, VV needs to "recompare" again before syncronise.
Is there any function could help to record and keep track of the "add" or "delete" of files of A, and it can syncronise from A to B QUICKLY without spending lots of time to "recompare" again and again, after my "daily" & "minor" update?
Is there any technology "photo shot" that can very quickly to "memorise" the whole structure and/or files of A, and then copy to B. When there's a failure of A, we can still get back all thing of A from B. |
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googlymoogly
Joined: 07 Mar 2009
Posts: 4
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| Posted: Tue Mar 10, 2009 10:50 am Post subject: Re: Speed up the comparison |
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| stanleywong wrote: | | Is there any function could help to record and keep track of the "add" or "delete" of files of A, and it can syncronise from A to B QUICKLY without spending lots of time to "recompare" again and again, after my "daily" & "minor" update? |
If ViceVersa monitored the USN journal in the filesystem (this would only work with local NTFS volumes, not network drives (unless there was some minimal satellite application you could install on remote computers)), this could be done.
Check the program Everything (external links not allowed, but it's made by VoidTools) for an example of the performance you can get by bypassing the normal Windows filesystem functions and reading the USN journal directly. |
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TGRMN Software
Site Admin
Joined: 10 Jan 2005
Posts: 8777
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| Posted: Tue Mar 10, 2009 1:12 pm Post subject: |
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Hello
Thanks for the info. VVEngine and VVLauncher do monitor the file system for changes. They know that a change has happened to source/target but do not know "what" change. So a rescan is needed. The next VVEngine will know what has changed and that will improve performances a lot, as re-comparing will no longer be needed.
_________________
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TGRMN Software Support
http://www.tgrmn.com
http://www.compareandmerge.com |
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mikeyww
Joined: 23 Dec 2009
Posts: 15
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| Posted: Wed Dec 23, 2009 1:21 pm Post subject: Comparison |
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| SyncBackPro has an option for fast backup. This actually avoids rescanning the destination after the first run. I'm not sure why it needs to scan the destination on the first run. It would be useful to have such an option that simply ignores what is on the destination and copies the files anyway or else finds matches and copies only newer files. |
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