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are SDLT tapes flaky? 4 of 10 of our tapes are defective
I have a Quantum SDLT320 drive on a linux host for which we've bought: 5
Quantum SDLT-I tapes and 5 HP SDLT-I tapes. I am alarmed that two of each brand are defective. Symptoms are twofold: 1 tape took tar files up to (I presume) capacity without error, but "tar tvf" of those files failed. 3 tapes would take tar files up to ~1/3 capacity (~75GB uncompressed data), but would not take tar files past that point. mt erase also failed similarly on those tapes. I can tar the same data that failed on those defective tapes onto the 6 good tapes. I've tried using other data and retensioning. I've searched group archives. Is it unusual to get 40% bad tapes from two vendors? (Is it possible these vendors are producing tapes to 'SDLT160 tolerance levels' and the tighter write-pattern of SDLT320 can't cope?) Also, are my verification methods ok: tar to new tape until full, rewind, "tar tvf /dev/null" and watch for errors. I wonder if it's an out-of-spec drive. How could I tell? Thanks. |
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