radisk - Digital Storage Architecture (DSA) disk maintenance
program
/sbin/radisk -c LBN length special
/sbin/radisk -e special
/sbin/radisk -n special
/sbin/radisk -r LBN special
/sbin/radisk -s LBN length special
The following options 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. Replaces a
block on the disk specified by LBN. See RESTRICTIONS.
Starts a scan for bad blocks on the specified area on a
disk. Bad blocks are disk blocks that have data transfer
errors to the extent that they cannot be relied on. When
a bad block is found, it is replaced and the bad block's
LBN is reported. The LBN specified with the -s option can
be 0 to indicate the first block in the specified partition.
If 0 is specified, however, the program starts
searching from the first block of the partition. The -s
option accepts any valid partition on the disk. This
allows any partition to be scanned without scanning the
entire disk and ensures that the specified partition is
free of bad blocks. As an example, /dev/rdisk/dsk0h indicates
the h partition of the boot disk, 0.
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.
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.
Commands: disklabel(8), mount(8), restore(8)
Networking: ra(7)
radisk(8)
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