Content-type: text/html Man page of radisk

radisk

Section: Maintenance Commands (8)
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NAME

radisk - Digital Storage Architecture (DSA) disk maintenance program  

SYNOPSIS

/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  

DESCRIPTION

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.  

FLAGS

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.

-r
Replaces a block on the disk specified by LBN. See Restrictions.
-s
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/rra3h indicates the h partition of the third logical disk unit.
 

RESTRICTIONS

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.  

ERRORS

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.  

RELATED INFORMATION

ra(7), disklabel(8), mount(8), restore(8) delim off delim off


 

Index

NAME
SYNOPSIS
DESCRIPTION
FLAGS
RESTRICTIONS
ERRORS
RELATED INFORMATION

This document was created by man2html, using the manual pages.
Time: 02:40:34 GMT, October 02, 2010