Samsung Galaxy Tab 7.0 Plus GT-P6210 ClockworkMod Recovery and Root

I tried the method developed by garyd9 at xda-developers and it works for my GT-P6210:

1. Install the latest version of Samsung Kies.
2. Download the p6210_CWMR_20120107.zip  to your PC.
3. Prepare a MicroSD Card for your tablet’s external SD card.
4. Connect your tablet to your PC. Copy the zip file to the external SD card.
5. Power off your tablet.
6. Reboot the device into recovery mode by holding the Volume Up button along with the Power button. 
7. In recovery mode, select the option to install update from external storage.
8. Locate the zip file in your external storage. Select the file by pressing the Power button.
9. When the rooting process finishes, reboot your device.
10. In Android Market or Google Play Store and search for the SuperUser app, BusyBox, and Root Checker Basic. 
11. Install the apps and run SuperUser and Root Checker Basic. 
12. Root Checker Basic's "Verify Root Access" will report "This device has root access!"
13. Reboot to the device into recovery mode and you will see the ClockworkMod menu.