Christoph Litauer schrieb: > Josh Fisher schrieb: >> This can happen when ClearPageReserved() is not called for a reserved >> kernel memory page. Could be an iSCSI driver (included with the Linux >> kernel) problem or, if you are using a hardware iSCSI adapter, it could >> be a problem with its driver. >> >>> My question is: What is the difference between the tape write actions of >>> tar and btape? Maybe I will be able to configure the tape device so that >>> btape doesn't run in kernel panics any more? >>> >> Well, btape is very likely using a different block size than you used >> with tar. The default block size for btape is 126x512 = 64,512 bytes. >> The default for tar is 20x512 = 10,240 bytes. Try setting 'Maximum block >> size = 10240' and 'Minimum block size = 10240' in the bacula-sd.conf >> config file being used by btape. If that works, then try tar with '-b >> 64512' and see if tar causes the same problem with large block sizes. If >> neither wroks with the larger block size, then you will have to use the >> smaller block size until the iSCSI bug is fixed. >> > > Thanks Josh, I think the blocksizes are a step in the right direction - > but no solution yet. In the meantime I changed the iSCSI-Switch and did > a few more tests: > > - tar xv -f /dev/nst0 -b 126 /var => no Problems > (I think -b 126 is right because - according to the manpage - tar > multiplies option -b with 512, 126x512 = 64512) > > - btape HP-LTO2, rawfill (maximum block size set to 10240) => panic > Output was: > *rawfill > btape: btape.c:2496 Begin writing raw blocks of 10240 bytes. > + > > - btape HP-LTO2, rawfill (maximum block size set to 8192) => panic > Output was: > *rawfill > btape: btape.c:2496 Begin writing raw blocks of 8192 bytes. > ++ > > > Any further ideas? >
Update: I experimented a little with blocksizes. Up to 4092 works great. More or equal than 5120 kills the machine. Any ideas, why 4092? -- Regards Christoph ________________________________________________________________________ Christoph Litauer [EMAIL PROTECTED] Uni Koblenz, Computing Center, http://www.uni-koblenz.de/~litauer Postfach 201602, 56016 Koblenz Fon: +49 261 287-1311, Fax: -100 1311 PGP-Fingerprint: F39C E314 2650 650D 8092 9514 3A56 FBD8 79E3 27B2 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
