I just rechecked things with the comments from the list. It seems the current access level of the tape didn't have any bearing on the situation. Right now I have a q mo showing one tape as R/W and the other as R/O. The q vol f=d is telling me that both tapes are Read/Write.
tsm: BACKUP1>q pr Process Process Description Status Number -------- -------------------- ------------------------------------------------- 616 Space Reclamation Offsite Volume(s) (storage pool NEWCOPYPOOL), Moved Files: 5868, Moved Bytes: 22,303,511,754, Unreadable Files: 543, Unreadable Bytes: 0. Current Physical File (bytes): 11,347,126,815 Current input volume: 000003L2. Current output volume: 000093L2. tsm: BACKUP1>q mo ANR8330I LTO volume 000003L2 is mounted R/O in drive DRV4 (mt0.5.0.5), status: IN USE. ANR8330I LTO volume 000093L2 is mounted R/W in drive DRV2 (mt0.3.0.5), status: IN USE. ANR8334I 2 matches found. tsm: BACKUP1>q vol 000003l2 f=d Volume Name: 000003L2 Storage Pool Name: NEWTAPEPOOL Device Class Name: LTO2 Estimated Capacity (MB): 431,430.2 Scaled Capacity Applied: Pct Util: 93.8 Volume Status: Full Access: Read/Write Pct. Reclaimable Space: 6.6 Scratch Volume?: Yes In Error State?: No Number of Writable Sides: 1 Number of Times Mounted: 18 Write Pass Number: 1 Approx. Date Last Written: 03/29/2005 17:13:29 Approx. Date Last Read: 04/01/2005 12:36:43 Date Became Pending: Number of Write Errors: 0 Number of Read Errors: 0 Volume Location: Volume is MVS Lanfree Capable : No Last Update by (administrator): Last Update Date/Time: 03/28/2005 21:27:17 tsm: BACKUP1>q vol 000093l2 f=d Volume Name: 000093L2 Storage Pool Name: NEWCOPYPOOL Device Class Name: LTO2 Estimated Capacity (MB): 204,800.0 Scaled Capacity Applied: Pct Util: 10.3 Volume Status: Filling Access: Read/Write Pct. Reclaimable Space: 0.0 Scratch Volume?: Yes In Error State?: No Number of Writable Sides: 1 Number of Times Mounted: 1 Write Pass Number: 1 Approx. Date Last Written: 04/01/2005 12:47:32 Approx. Date Last Read: 04/01/2005 12:02:48 Date Became Pending: Number of Write Errors: 0 Number of Read Errors: 0 Volume Location: Volume is MVS Lanfree Capable : No Last Update by (administrator): Last Update Date/Time: 04/01/2005 12:01:20