>T. Horsnell wrote: >... >> The problem appears to be that the tapes drop records >> when being written, but that this can be fixed by increasing >> the blocksize. >... > >Are you sure that it is during the write operation? > >> [root@ls1 ~]$ dd if=tapetest500K of=/dev/st1 bs=10240 ; dd if=/dev/st1 of=junk bs=10240 ; cmp tapetest500K junk >> 48+1 records in >> 48+1 records out >> 36+1 records in >> 36+1 records out >> tapetest500K junk differ: byte 215041, line 854 > >If you add another > >dd if=/dev/st1 of=junk2 bs=10240 > >does that equal junk or is the error in another position? [root@ls1 ~]$ dd if=tapetest500K of=/dev/st1 bs=10240 ; dd if=/dev/st1 of=junk bs=10240 ; cmp tapetest500K junk 48+1 records in 48+1 records out 34+0 records in 34+0 records out tapetest500K junk differ: byte 153601, line 593 [root@ls1 ~]$ dd if=/dev/st1 of=junk2 bs=10240; cmp junk junk2 34+0 records in 34+0 records out [root@ls1 ~]$ dd if=tapetest50M of=/dev/st1 bs=10240 ; dd if=/dev/st1 of=junk bs=10240 ; cmp tapetest50M junk 4882+1 records in 4882+1 records out 2576+1 records in 2576+1 records out tapetest50M junk differ: byte 153601, line 628 [root@ls1 ~]$ df -k . Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda7 1004024 456760 496260 48% / [root@ls1 ~]$ dd if=/dev/st1 of=junk2 bs=10240 2576+1 records in 2576+1 records out [root@ls1 ~]$ diff junk junk2 Furthermore, looking at the byte position at which cmp fails, its always on an exact record boundary. Also, I have a tape utility which can tell me the size of tape records. Using this I see that the last record (the fractional part if the filesize is not an integral number of tape-blocks) is always the correct size (I dont know whether it has the correct contents). The problem still occurs if I make the filesize an integral number of tape-records. I'll put the tapelibrary back on my Alpha box and check what I get when I read tapes which were written on the Opteron. This should clinch the theory that its a write problem (or not, as the case may be) > >The library has two drives, right? Is it a problem on >both drives? Yes. (See the end of my first post). Cheers, Terry. > >Mogens > >-- >Mogens Kjaer, Carlsberg A/S, Computer Department >Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark >Phone: +45 33 27 53 25, Fax: +45 33 27 47 08 >Email: mk@xxxxxx Homepage: http://www.crc.dk > >-- >fedora-list mailing list >fedora-list@xxxxxxxxxx >To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list >
