Hi,

is there a way to see if a tape/drive is shoe-shining? I've backup
jobs that will run for several days, with spooling it will take even
longer.

I tried to backup with and without spooling, both jobs wrote with
~75 MB/s to the tape. But I can't say if there were short periods of
time where the drive had to stop/start again. LTO-4 needs a minimum
speed of 40 MB/s (nativ) to write continuously to the tape.

I monitored the disk/net stats on the backup sever with dstat. Most of
the time disk IO was >60 MB/s, but there where some short interrupts.

How can I get information about how often a tape drive started/stopped
writing to tape? Is there a way to monitor the throughput of the SCSI
interface to the drive?

Ralf

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