Spectra Logic T-Series Spectra T200 Release Note page 17

Matching Drive Firmware and Drive Sled Firmware
IBM LTO-4 drive firmware version 8940 or later requires drive sled (DCM)
firmware version 3.18 (build 6), which is included in the BlueScale10.4.0
and later firmware packages. LTO-4 drives running firmware version 8940
or later are not compatible with BlueScale firmware versions earlier than
10.4.0.
Compatibility occurs when:
Incompatibility occurs when:
DO NOT install earlier releases of the drive firmware or the drive sled firmware in an
Caution
attempt to make the drive and library firmware levels match. This action breaks the
drive's ability to communicate with the library, and renders the drive inoperable.
You will then have to obtain a replacement drive from Spectra Logic.
December 2008
you install a new LTO-4 drive running the latest firmware version in a
library running BlueScale10.4.0 or later.
you upgrade your library to BlueScale 10.4.0 or later, and then upgrade
your existing LTO-4 drives to the latest firmware version.
you upgrade your existing LTO-4 drive to the latest firmware version
and then install it in a library running a pre-BlueScale10.4.0 version of
the library firmware. Drives running firmware version 8940 or later are
not compatible with library firmware versions earlier than
BlueScale10.4.0.
you install a new LTO-4 drive running the latest firmware version,
update the drive sled (DCM) portion of the library firmware to
version 3.18, but do not perform a full library firmware update to
BlueScale10.4.0 or later. Because the drive sled firmware version 3.18 is
present, the drive is able to communicate, but the pre-BlueScale10.4.0
library firmware detects a mismatch between the firmware versions
and displays a firmware mismatch message.
To ensure compatibility, upgrade your library to BlueScale10.4.0 or
later, and then update your drive firmware as described in this section.
If you are unable upgrade to BlueScale10.4.0 at this time, you can
ignore the firmware version mismatch message until you can schedule
time to upgrade the library to BlueScale10.4.0 or later.
Working with Hardware Components
T200, T380, and T680 Libraries
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