Zitat von David Pearce <[email protected]>:
Back in the day when loaders were not popular, we could listen to a tape drive to detect shoe-shining, which would kill the transfer rate.Now that we have tape loaders we can hear the tape drives. And now that we have excellent software like Bareos that brings job multiplexing, how do we know if the tape drive is getting data fast enough to make the tape drives stream?
With tape loaders you can still hear the sound of "shoe-shining" at least if you are willing to deply dive in the rack ;-) On the other hand you can check the transfer rate Bareos tells you when despooling to see if it comes close to the expected transfer rate. We have LTO4 and with nearly no stop-start cycles in between we get 90..100MByte/sec uncompressable (encrypted) data rate, with a too slow spooling area we got around 60..80MByte/sec with the same hardware/software settings. That said the shoe-shining is not as bad as in former days because LTO can adjust the speed to prevent shoe-shining most of the time, but only if the data rate is constantly too low, not with short dropouts.
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