Both NetBackup and NetWorker use the following filemark handling. [data][filemark1][data][filemark1][data][filemark1][filemark2]
Using the 'bsd' close (vs AT&T close), the tape head is positioned after [filemark1] and before [filemark2]. A new 'write' command will overwrite [filemark2]. Using this method, end of valid backup data is easily detected by two consecutive filemarks on tape. If there is only one filemark, there is more valid data to follow. Note: filemark1 and filemark2 are just 'filemarks' - they are not different types of filemarks. (Just in case this created any sort of confusion). Cheers Mark -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Richard Sharpe Sent: Wednesday, July 30, 2008 9:45 AM To: stgt-devel Subject: [Stgt-devel] Dealing with filemarks in SSC ... I have been looking at this issue of filemarks in SSC, and it seems to me that there are a couple of questions that need to be answered. For example, if there are two file marks on a tape, or even three, and you write records onto the tape and overwrite one of the file marks, in some sense the drive should still be able to seek to the old second filemark (now the first filemark) ... and reliably recover the third file on the tape. I don't know if any software depends on that behavior, though. _______________________________________________ Stgt-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/stgt-devel _______________________________________________ Stgt-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/stgt-devel
