In Solaris (and thus OmniOS) tape drives are mapped to /dev/rmt (raw media tape) using the following device naming scheme:

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/dev/rmt/XAbn

• X is the drive number (0-n)
• A is the optional density (c for compressed, u for ultra)
• b for BSD compatible behaviour (needed for bacula)
• n is an optional no-rewind (n) [omit for rewind]

So, using compression and BSD compatible behaviour with no-rewind, the two LTO3 tape drives in my PowerVault ML6010 are at:

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/dev/rmt/0cbn
/dev/rmt/1cbn

The autochanger is mapped to:

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/dev/scsi/changer/cXX

Where cXX is the SCSI controller number.