radisk - Digital Storage Architecture (DSA) disk maintenance program
/sbin/radisk -e special
/sbin/radisk -n special
/sbin/radisk -r LBN special
/sbin/radisk -s LBN length special
The radisk Digital Storage Architecture (DSA) disk maintenance program allows you to maintain DSA disk devices. The radisk command must be used on unmounted disk partitions to ensure correct results.
The LBN is a decimal number that represents the logical block number as reported in the errorlog file. The LBN is the actual disk block number starting from the beginning of the disk.
The length is a decimal number that indicates how many (512 byte) blocks to process. The length specified can be -1 to indicate the last block of the specified partition.
The special file specified is used with -c, -e, -n, and -r options and indicates an unmounted c partition of a character device special file.
The following flags can be used with radisk: Clears a forced error indicator on the range of specified LBNs. The forced error condition indicates that the data in the disk block is bad. The disk block is good, but the data can not be read without getting an error detection code (EDC) error. This option causes the forced error condition to be removed. After the forced error indicator is cleared, the EDC error is not reported nor will the data be marked as bad. The data should be restored either by manual methods or with the restore command. The radisk command affects the integrity of the data on a disk and should be followed by a file system restore if data is affected. Sets the exclusive access attribute associated with the specified disk. This attribute is provided by multihost controllers to restrict access to a disk to one host. The radisk command returns a failure status if the disk is already exclusively associated with another host or the underlying controller does not provide multihost support. If the command is issued to a disk that is currently mounted and the command fails, the disk is no longer on line to this host. For this reason the -e option should not be issued to a disk that is mounted. Clears the exclusive access attribute associated with the specified disk. If the controller provides multihost support and the exclusive access attribute is not set for a particular disk, it would be possible for the disk to be accessed by more than one host. The radisk command returns a failure status if the disk is not currently and exclusively associated with this host or the underlying controller does not provide multihost support.
You must be in single-user mode when using the -c, -r, and -s options of the radisk program. If you are in multiuser mode, radisk hangs the system and cannot be killed. If this happens, you must reboot.
The -r option is supported only with those DSA disks which use host-initiated dynamic bad block replacement.
The -e and -n options are only supported on controllers that provide multi-host support. These options are only supported on HSC Version 5.00 or later.
The radisk program generates messages when the user is not privileged, when the LBN is not in the specified partition, and when the length exceeds the size of the partition.
ra(7), disklabel(8), mount(8), restore(8) delim off delim off