Re: [Bacula-users] recover partial readable tape
Hi, 04.03.2009 19:07, Thomas Mueller wrote: Is there a way to reassemble the two parts of the file and reread them with bacula? i've not found any option like skip file 4 to 20 with the bextract,bscan,bls tools You should use a bootstrap file to that purpose. The easiest way would be to initiate a restore from the console, and when all is done, instead of starting the job, copy the created bootstrap file and cancel the restore. Then, in the bootstrap file, remove all records pointing to tape files 5 to 19. Alternatively, it's not too big a task to manually write a minimal bootstrap file, omitting the files in question. ... I'd use bls with j, k, L, p and v options to get a better idea of what actually is in the resulting volume file. problem: the tape drive doesn't go over file 4, it's running in circles telling me that it skipped a block but next message telling me again that the same block is beeing skipped (and so on). Ok... somehow I got the impression that you could fsf' over the damaged files... which seems to be obvious as you say you fond that later tape files are ok. if i do an mt fsf 5 i need to rewind the tape to get access again, else it will print i/o error. Ok, for me to really understand what happens we need to go back to the shell :-) When you load that tape, you can fsf to, say, file 21, and the tape drive reports the correct position. But when, with the tape freshly loaded, you read to the end of file four, you can't fsf and more, not even fsf'ing 17 files to end up beyond the damaged area. Is that a correct description? Arno -- Arno Lehmann IT-Service Lehmann Sandstr. 6, 49080 Osnabrück www.its-lehmann.de -- Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
[Bacula-users] recover partial readable tape (was: I/O error with quantum lto-4)
hi i've found out, that the error on tape is between file 4 and 20. i can successfull forward space to file 20 (mt -f /dev/nst0 20). reading from file 0 with dd if=/dev/nst0 of=/dev/null bs=64512 works until file 4 and 235MB. Is there a way to reassemble the two parts of the file and reread them with bacula? i've not found any option like skip file 4 to 20 with the bextract,bscan,bls tools i've allready read the first part of the tape to a file and tried to read it from there. No luck so far: bls: match.c:249-0 add_fname_to_include prefix=0 gzip=0 fname=/ bls: butil.c:282 Using device: /srv/backup/vtl for reading. 04-Mar 16:50 bls JobId 0: Ready to read from volume ARCHIVE- on device FileStorage (/srv/backup/vtl). 04-Mar 16:50 bls JobId 0: Error: block.c:275 Volume data error at 0:64511! Wanted ID: BB02, got . Buffer discarded. 0 files found. bls: acquire.c:436-0 dir_update_vol_info. label=64 Vol=ARCHIVE- seems that not all data is in correct order. if i do a strings ARCHIVE-: BB02 Bacula 1.0 immortal ARCHIVE- Archive Backup LTO-4 backuphost backuphost-sd Ver. 2.2.8 26 January 2008 Build Mar 28 2008 17:04:06 ... so BB02 seems to be there. anybody allready did such a tape reassembling? or if any programmer is out there: is it a big task to implement a skip file(s) option to the volume utilities? - Thomas -- Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
Re: [Bacula-users] recover partial readable tape
Hi, 04.03.2009 17:01, Thomas Mueller wrote: hi i've found out, that the error on tape is between file 4 and 20. i can successfull forward space to file 20 (mt -f /dev/nst0 20). Good start. reading from file 0 with dd if=/dev/nst0 of=/dev/null bs=64512 works until file 4 and 235MB. Is there a way to reassemble the two parts of the file and reread them with bacula? i've not found any option like skip file 4 to 20 with the bextract,bscan,bls tools You should use a bootstrap file to that purpose. The easiest way would be to initiate a restore from the console, and when all is done, instead of starting the job, copy the created bootstrap file and cancel the restore. Then, in the bootstrap file, remove all records pointing to tape files 5 to 19. Alternatively, it's not too big a task to manually write a minimal bootstrap file, omitting the files in question. When restoring, I guess you can expect problems with the files that have data partly in the affected tape files, but that might still be better than getting back nothing at all. i've allready read the first part of the tape to a file and tried to read it from there. No luck so far: bls: match.c:249-0 add_fname_to_include prefix=0 gzip=0 fname=/ bls: butil.c:282 Using device: /srv/backup/vtl for reading. 04-Mar 16:50 bls JobId 0: Ready to read from volume ARCHIVE- on device FileStorage (/srv/backup/vtl). 04-Mar 16:50 bls JobId 0: Error: block.c:275 Volume data error at 0:64511! Wanted ID: BB02, got . Buffer discarded. 0 files found. bls: acquire.c:436-0 dir_update_vol_info. label=64 Vol=ARCHIVE- seems that not all data is in correct order. if i do a strings ARCHIVE-: I'd use bls with j, k, L, p and v options to get a better idea of what actually is in the resulting volume file. BB02 Bacula 1.0 immortal ARCHIVE- Archive Backup LTO-4 backuphost backuphost-sd Ver. 2.2.8 26 January 2008 Build Mar 28 2008 17:04:06 ... so BB02 seems to be there. But we don't know if it'S in the right place, i.e. where Bacula expects the header data... anybody allready did such a tape reassembling? Well... kind of. Not with tape files unreadable, but with extra or missing EOF marks. It's not exactly fun, but better than losing data in most cases :-) or if any programmer is out there: is it a big task to implement a skip file(s) option to the volume utilities? I guess you'll get a response similar to manually edit the bootstrap file; the feature doesn't seem to be critical to most users, so we won't invest much there as long as more pressing projects are pending. Arno - Thomas -- Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users -- Arno Lehmann IT-Service Lehmann Sandstr. 6, 49080 Osnabrück www.its-lehmann.de -- Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
Re: [Bacula-users] recover partial readable tape
Is there a way to reassemble the two parts of the file and reread them with bacula? i've not found any option like skip file 4 to 20 with the bextract,bscan,bls tools You should use a bootstrap file to that purpose. The easiest way would be to initiate a restore from the console, and when all is done, instead of starting the job, copy the created bootstrap file and cancel the restore. Then, in the bootstrap file, remove all records pointing to tape files 5 to 19. Alternatively, it's not too big a task to manually write a minimal bootstrap file, omitting the files in question. the problem is, that the data isn't in the catalog anymore. it got pruned after 6 months. the client limit was accidentially set to this value... also see my bls comment below. but just thought about it, and there has to be a backup from the catalog. where the ARCHIVE- volume is still available with file entries. When restoring, I guess you can expect problems with the files that have data partly in the affected tape files, but that might still be better than getting back nothing at all. yeah, better loose 16GB than 1,3TB. :) i've allready read the first part of the tape to a file and tried to read it from there. No luck so far: bls: match.c:249-0 add_fname_to_include prefix=0 gzip=0 fname=/ bls: butil.c:282 Using device: /srv/backup/vtl for reading. 04-Mar 16:50 bls JobId 0: Ready to read from volume ARCHIVE- on device FileStorage (/srv/backup/vtl). 04-Mar 16:50 bls JobId 0: Error: block.c:275 Volume data error at 0:64511! Wanted ID: BB02, got . Buffer discarded. 0 files found. bls: acquire.c:436-0 dir_update_vol_info. label=64 Vol=ARCHIVE- seems that not all data is in correct order. if i do a strings ARCHIVE-: I'd use bls with j, k, L, p and v options to get a better idea of what actually is in the resulting volume file. problem: the tape drive doesn't go over file 4, it's running in circles telling me that it skipped a block but next message telling me again that the same block is beeing skipped (and so on). if i do an mt fsf 5 i need to rewind the tape to get access again, else it will print i/o error. so the bacula utilities won't give me a file list and restoring the whole job doesn't work because of the defective area. sort of henn/egg problem. or if any programmer is out there: is it a big task to implement a skip file(s) option to the volume utilities? I guess you'll get a response similar to manually edit the bootstrap file; the feature doesn't seem to be critical to most users, so we won't invest much there as long as more pressing projects are pending. think the feature is cirtical for users whose catalog entries got pruned, no (maybe a really old one is needed) catalog backup is available and the tape is not in a good state. Thanks - Thomas -- Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H ___ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
