Medium Optical Disk (RW551/RW552) Library
5–40
EK–MOL80–SV. B01
Re-initializing the Jukebox Controller PCA RAM After Service
All the RAM on the autochanger controller PCA is kept alive through a charged
capacitor, and is, therefore, relatively non-volatile. If this RAM is backed up to
flash EEPROM after any changes, the values are held permanently. If not backed
up to flash EEPROM, information bleeds off in approximately 10 to 60 days.
Most of the RAM is initialized to known values at powerup. Variables that are
not changed are customer configurations, autochanger logs, autochanger odome-
ters, element status variables, and variables that help the autochanger recover
from power failures. These variables are set by the "Set Defaults" and "Clear
Odometers" configurations.
NVRAM must be re-initialized after replacing the autochanger controller PCA,
after updating or changing the autochanger controller PCA firmware, and after
replacing a drive mechanism. This is done by selecting and executing both the
"Set Defaults" and "Clear Odometers" configurations on the control panel.
Also, the jukebox should be power cycled after setting these configurations so
that an automatic execution of ISTAT will occur. This re-establishes which slots
are full and which are empty.
Variables set by "Set Defaults"
•
SCSI address of the autochanger
•
Configurable options set to system defaults (ROM-dependent)
−
whether the autochanger should report recovered errors
−
whether the autochanger should rotate the mailslot inwards when in secure
mode
−
whether the autochanger should automatically initialize element status
when cartridges are found in unexpected places (ROM-dependent)
•
Drive status variables
−
reported SCSI address of the drive set to system defaults
−
clear the source of the disk in the drive
•
Power fail variables
−
whether the last move that was started is set to FALSE
−
clear the state of the last move
•
Security variables
−
clear Unit Reserved
−
clear Prevent Media Removal for each SCSI ID
•
Element Status variables
−
clear exception bits
−
clear element reservations
−
empty/full status of all storage slots (ISTAT needed)
