On May 29, 2015, at 3:30 PM, Dan Langille <d...@langille.org> wrote: > > >> On May 26, 2015, at 3:25 AM, Kern Sibbald <k...@sibbald.com> wrote: >> >> >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> Yes, sorry, in my last email, I was confused between the number of blocks >> and the block size. >> >> - From you recent tests I don't totally understand why it claims "Write >> failed" but the status is zero, but >> at least it seems to have worked correctly. >> >> Bottom line, it looks like a problem with older tapes -- either a real error >> or a missing LEOF marker. >> In principle this should be OK since Bacula is very conservative, but it >> could also cause Bacula to incorrectly restore a partial block. > > Good. I will keep testing my tapes. It takes about 5 hours. > > So far, they all seem to be similar. > > I did the math on the scan figures (# block * bytes). Today's tape held > 101.952GB, the one in the earlier test took 102.092 GB. > > I'm guessing that's within spec, and I will keep such tapes in use. I will > toss anything which fails at only a few hundred MB. > > Kern: thank you for suggesting this test. It will be useful > > today's output: > > ### > weof_dev > Wrote EOF to /dev/sa0 > Write failed. Last block written=1582527. stat=0 ERR=No such file or > directory > *rewind > Rewound /dev/sa0 > *scan > Starting scan at file 0 > > > 1582527 blocks of 64512 bytes in file 0 > End of File mark. > End of File mark. > End of tape > Total files=1, blocks=1582527, bytes = -987233280 > ###
So far, I have tested perhaps 80 tapes. I find that if the rawfill succeeds, the scan will too. I'm beginning to consider not running the scan if the rawfill succeeds. By 'succeed', I mean rawfill concludes with messages similar to the above and without messages like the following. > ioctl MTWEOF error on /dev/sa0. ERR=Input/output error. > Bad status from weof -1. ERR=Input/output error FYI, this has helped me identify about 30 tapes which I will no longer use. — Dan Langille http://langille <http://langille/>.org/
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