Time Machine, Deep event scan at path: /Volumes/Data reason:must scan subdirs|require scan|

Had a data drive failure, replaced it. Restored just that volume's data from TM to the new drive via "cp -a".   For some reason just that drive (DATA) forces a full scan at every TM backup.   Have also upgraded to 10.8.1 to see it that would fix things, but no.
from .Backup.log:
Running preflight for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 6DA5C1F4-C522-48B2-892A-36362C54F632)
        Scanning nodes needing deep traversal
        Deep event scan at path: /Volumes/Data reason:must scan subdirs|require scan|
        Calculating size of changes
        Should copy 61 items (76 KB) representing 18 blocks of size 4096. 510751904 blocks available.
Preflight complete for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 6DA5C1F4-C522-48B2-892A-36362C54F632)
Time elapsed: 0.002 seconds
Mind you at this point, I've excluded all of the contents of DATA from actually being backed up (the 61 items is a separate bug in backupd where it reports file counts incrementally instead of per volume), it was doing a FULL copy every time, regardless of what actually changed.
From everything I've been able to read/find/fiddle with, the part that doesn't make sense is the the "require scan" on the "Deep event" line above. Other people have had problems with full scans, but it's usually something about 'no fsevents db' or "fsevents reset"..   this one feels like a setting somewhere telling it to do a full scan, and that's where I'm lost.
The only thing I haven't done yet is fully reset the TM machine drive.. I'll do it, but in theory there should be a reason that will fix this. I.e. a setting on there I could fix instead. I'm not a big fan of reboot/reinstall/... method of fixing things, it just hides the problem instead of solving it.
And to make this into a question.. how do I fix "Data" to be more like my "Video" drive :
Running preflight for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
        Calculating size of changes
        Should copy 58 items (32 KB) representing 7 blocks of size 4096. 510751904 blocks available.
Preflight complete for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Time elapsed: 0.000 seconds
Thoughts?

when this one went off, I wasn't even home. only safari, console, terminal and finder running. though there is a cp running to copy things off of the Data drive to an external usb for safety's sake.
syslog:
8/26/12 7:46:56.322 PM com.apple.backupd[4449]: Starting automatic backup
8/26/12 7:46:58.576 PM com.apple.backupd[4449]: Backing up to: /Volumes/Time Machine/Backups.backupdb
8/26/12 7:47:05.840 PM com.apple.backupd[4449]: Forcing deep traversal on source: "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
8/26/12 7:47:06.009 PM com.apple.backupd[4449]: Using file event preflight for Fast
8/26/12 7:47:07.420 PM com.apple.backupd[4449]: Will copy (207 KB) from Fast
8/26/12 7:47:07.421 PM com.apple.backupd[4449]: Using file event preflight for Video
8/26/12 7:47:07.421 PM com.apple.backupd[4449]: Will copy (Zero KB) from Video
8/26/12 7:47:07.733 PM com.apple.backupd[4449]: Deep event scan at path:/Volumes/Data reason:must scan subdirs|require scan|
8/26/12 7:47:07.733 PM com.apple.backupd[4449]: Finished scan
8/26/12 7:47:25.056 PM com.apple.backupd[4449]: Found 2112 files (26.2 MB) needing backup
8/26/12 7:47:25.064 PM com.apple.backupd[4449]: 1.92 GB required (including padding), 2.46 TB available
8/26/12 7:48:31.092 PM com.apple.backupd[4449]: Copied 1258 files (4.3 MB) from volume Fast.
8/26/12 7:48:36.552 PM com.apple.backupd[4449]: Copied 1264 files (4.3 MB) from volume Video.
8/26/12 7:57:01.251 PM com.apple.backupd[4449]: Copied 3328 files (29.6 MB) from volume Data.
8/26/12 7:57:01.571 PM com.apple.backupd[4449]: Using file event preflight for Fast
8/26/12 7:57:02.468 PM com.apple.backupd[4449]: Will copy (46 KB) from Fast
8/26/12 7:57:19.956 PM com.apple.backupd[4449]: Found 2088 files (26.1 MB) needing backup
8/26/12 7:57:19.957 PM com.apple.backupd[4449]: 1.92 GB required (including padding), 2.41 TB available
8/26/12 7:58:04.441 PM com.apple.backupd[4449]: Copied 428 files (263 KB) from volume Fast.
8/26/12 7:58:15.160 PM com.apple.backupd[4449]: Copied 434 files (263 KB) from volume Video.
8/26/12 8:06:45.605 PM com.apple.backupd[4449]: Copied 2498 files (25.6 MB) from volume Data.
8/26/12 8:06:55.112 PM com.apple.backupd[4449]: Created new backup: 2012-08-26-200653
8/26/12 8:07:26.837 PM com.apple.backupd[4449]: Starting post-backup thinning
8/26/12 8:07:26.837 PM com.apple.backupd[4449]: No post-back up thinning needed: no expired backups exist
8/26/12 8:07:26.882 PM com.apple.backupd[4449]: Backup completed successfully.
.Backup.log
2012-08-26-19:47:05 - Starting backup
Previous snapshot:
          /Volumes/Time Machine/Backups.backupdb/Peter Drier’s Mac Pro/2012-08-26-192548
Date of Previous snapshot: 1346023548470589
Will use FS events for "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
Gathering events since 7162257515116441245.
Will use FS events for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Gathering events since 7162257515113311785.
Will traverse "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
=== Starting backup loop #1 ===
Will use IncrementalBackupCopier
Running preflight for "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
          Calculating size of changes
          Should copy 48 items (207 KB) representing 50 blocks of size 4096. 600903601 blocks available.
Preflight complete for "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
Time elapsed: 1.412 seconds
Running preflight for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
          Calculating size of changes
          Should copy 48 items (207 KB) representing 50 blocks of size 4096. 600903601 blocks available.
Preflight complete for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Time elapsed: 0.001 seconds
Running preflight for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
          Scanning nodes needing deep traversal
          Deep event scan at path: /Volumes/Data reason:must scan subdirs|require scan|
          Calculating size of changes
          Should copy 2112 items (26.2 MB) representing 6400 blocks of size 4096. 600528095 blocks available.
Preflight complete for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
Time elapsed: 17.634 seconds
Processing preflight info
          Space needed for this backup: 1.92 GB (468018 blocks of size 4096)
          Preserving last snapshot /Volumes/Time Machine/Backups.backupdb/Peter Drier’s Mac Pro/2012-08-26-192548
Finished processing preflight info
Copying items from "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
Finished copying items for "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
Time elapsed: 1 minute, 6.000 seconds
          Copied 1258 items (4.3 MB)
Gathering events since 7162257515117251301.
Needs new backup due to change in /private/var/db/.dat1161.001
Copying items from "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Finished copying items for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Time elapsed: 4.589 seconds
          Copied 1264 items (4.3 MB)
Gathering events since 7162257515113311785.
Copying items from "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
Finished copying items for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
Time elapsed: 8 minutes, 24.000 seconds
          Copied 3328 items (29.6 MB)
=== Starting backup loop #2 ===
Will use IncrementalBackupCopier
Running preflight for "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
          Calculating size of changes
          Should copy 23 items (46 KB) representing 11 blocks of size 4096. 588570106 blocks available.
Preflight complete for "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
Time elapsed: 0.898 seconds
Running preflight for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
          Calculating size of changes
          Should copy 24 items (46 KB) representing 11 blocks of size 4096. 588550912 blocks available.
Preflight complete for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Time elapsed: 1.407 seconds
Running preflight for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
          Calculating size of changes
          Should copy 2088 items (26.1 MB) representing 6360 blocks of size 4096. 588164391 blocks available.
Preflight complete for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
Time elapsed: 16.080 seconds
Processing preflight info
          Space needed for this backup: 1.92 GB (468003 blocks of size 4096)
          Preserving last snapshot /Volumes/Time Machine/Backups.backupdb/Peter Drier’s Mac Pro/2012-08-26-194705.inProgress/220D224E-57C5-4AE7-ACC9-B362141889D7
Finished processing preflight info
Copying items from "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
Finished copying items for "Fast" (mount: '/' fsUUID: 79881815-0EDF-3698-A685-315F87B9BE52 eventDBUUID: F0683183-083A-408F-930C-AAE5DA0C3F5E)
Time elapsed: 44.483 seconds
          Copied 428 items (263 KB)
Gathering events since 7162257515117277992.
Needs new backup due to change in /Users/drierp/Library/Messages/chat.db-wal
Copying items from "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Finished copying items for "Video" (mount: '/Volumes/Video' fsUUID: A34192F9-20D3-3CCD-B80D-D55FC4EF34DC eventDBUUID: 2BD9CE6F-CCC5-456C-B1E4-26111ADAF2BE)
Time elapsed: 10.449 seconds
          Copied 434 items (263 KB)
Gathering events since 7162257515113311785.
Copying items from "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
Finished copying items for "Data" (mount: '/Volumes/Data' fsUUID: 35066226-2A07-3845-AF7F-69FE0268B156 eventDBUUID: 9CD375B1-5483-4D33-8759-1B5AC2E9A7E7)
Time elapsed: 8 minutes, 30.000 seconds
          Copied 2498 items (25.6 MB)
Some filesystem changes made during the course of the backup may not be accounted for. Still busy after 2 retries.
Backup complete.
Total time elapsed: 19 minutes, 47.000 seconds

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