BBMΒΆ
BBM Displays/Changes the Bad Block Manager (BBM) functionality.
This command is used to enable and disable the Bad Block Manager (BBM) feature in the system. The bad blocks can be displayed, defaulted, and edited. Each LUN in the system can be configured to use the Bad Block Manager independently.
- CC_ONLY=[ON|OFF]
- This parameter is used to turn ON or OFF the Check Condition Only functionality. When ON, the Bad Block Manager generates a check condition SCSI status when attempting to read a host LBA that overlaps a bad block for the LUN specified. When OFF, the Bad Block Manager generates a check condition SCSI status but also gives the host the corrupted data when attempting to read a Host LBA deemed a BB on the system. The CC_ONLY option is defaulted to ON.
- DEFAULT
- This parameter is used to default the configuration and all entries for all LUNs. When this command is done it will have performed a ‘clean’ operation such that BBM will be in a completely defaulted power up state. The default configuration is as follows : BBM top level is disabled. All LUNs are disabled for BBM processing at the LUN level. Check condition on BBM will be set to also provide back data.
- DISABLE
- Disables the Bad Block Manager feature in the system. This is the disable that shuts down BBM tracking at the highest level. When this is disabled, the BBM feature will not be in use for any part of the system.
- ENABLE
- Enables the Bad Block Manager feature in the system. This is the highest level enable that allows the system to be able to start using the BBM. To actually put the BBM feature in use, individual LUN enables must also be activated via the ‘LUN_ENABLE’ command.
- LUN_DEFAULT
- This parameter is used to default lun entries in the BBM for specified LUNs.
- LUN_DISABLE
- Disables the Bad Block Manager (BBM) feature in the system for all LUNs or a set of user specified LUNs where the Bad Block entries for that LUN will no longer be examined and no SCSI Check Condition (CC) status messages will be generated based upon the Bad Block entries for the LUN(s). While the BBM for a LUN is disabled, the user is still allowed to edit, default, and display Bad Block information on the LUN. This is the default setting.
- LUN_DISPLAY
- This parameter allows the user to display the Bad Block Manager data (including the entries in the bad block list) for all LUNs or a set of user specified LUNs.
- LUN_EDIT[=x]
- This parameter allows the user to edit the Bad Block Manager for a specified LUN. This will provide an interactive session for the user to make changes to the bad block entries.
- LUN_ENABLE
- Enables the Bad Block Manager feature in the system for all LUNs or a set of user specified LUNs where unrecoverable data conditions will be added to this LUN and the bad block entries will be managed. Bad block entries will be added for this LUN when data read from the disks do not provide enough information to recreate the host data. Bad block entries will be removed from this LUN when host data is written over an area that is considered a bad block. All reads and writes will be checked against the Bad Block Manager when the LUN is enabled for processing bad blocks. The default setting is disabled.
- LUN_SUMMARY
- This parameter allows the user to display the Bad Block Manager summary for all LUNs or a set of user specified LUNs.