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svhlabel(8) [netbsd man page]

SVHLABEL(8)						    BSD System Manager's Manual 					       SVHLABEL(8)

NAME
svhlabel -- update disk label from SGI Volume Header SYNOPSIS
svhlabel [-fqrw] device DESCRIPTION
svhlabel is used to update a NetBSD disk label from the Silicon Graphics Volume Header on disks that were previously used on IRIX systems. svhlabel scans the Volume Header contained in the first blocks of the disk and generates additional partition entries for the disk from the entries found. Each Volume Header entry which does not have an equivalent partition in the disk label (equivalent in having the same size and offset) is added to the first free partition slot in the disk label. A free partition slot is defined as one with an fstype of 'unused' and a size of zero ('0'). If there are not enough free slots in the disk label, a warning will be issued. The raw partition (typically partition c, but d on i386 and some other platforms) is left alone during this process. By default, the proposed changed disk label will be displayed and no disk label update will occur. Available options: -f Force an update, even if there has been no change. -q Performs operations in a quiet fashion. -r In conjunction with -w, also update the on-disk label. You probably do not want to do this. -w Update the in-core label if it has been changed. SEE ALSO
disklabel(8), dkctl(8), mount_efs(8), sgivol(8) HISTORY
The svhlabel command appeared in NetBSD 5.0. BSD
February 26, 2007 BSD

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disklabel(4)						     Kernel Interfaces Manual						      disklabel(4)

NAME
disklabel - Disk pack label SYNOPSIS
#include <sys/disklabel.h> DESCRIPTION
Each disk or disk pack on a system may contain a disk label which provides detailed information about the geometry of the disk and the par- titions into which the disk is divided. It should be initialized when the disk is formatted, and may be changed later with the disklabel program. This information is used by the system disk driver and by the bootstrap program to determine how to program the drive and where to find the file systems on the disk partitions. Additional information is used by the file system in order to use the disk most effi- ciently and to locate important file system information. The description of each partition contains an identifier for the partition type (standard file system, swap area, etc.). The file system updates the in-core copy of the label if it contains incomplete information about the file system. The label is located in sector number LABELSECTOR of the drive, usually sector 0 (zero) where it may be found without any information about the disk geometry. It is at an offset LABELOFFSET from the beginning of the sector, to allow room for the initial bootstrap. The disk sector containing the label is normally made read-only so that it is not accidentally overwritten by pack-to-pack copies or swap opera- tions; the DIOCWLABEL ioctl, which is done as needed by the disklabel program, allows modification of the label sector. A copy of the in-core label for a disk can be obtained with the DIOCGDINFO ioctl; this works with a file descriptor for a block or charac- ter (raw) device for any partition of the disk. The in-core copy of the label is set by the DIOCSDINFO ioctl. The offset of a partition cannot generally be changed, nor made smaller while it is open. One exception is that any change is allowed if no label was found on the disk, and the driver was able to construct only a skeletal label without partition information. Finally, the DIOCWDINFO ioctl operation sets the in-core label and then updates the on-disk label; there must be an existing label on the disk for this operation to succeed. Thus, the initial label for a disk or disk pack must be installed by writing to the raw disk. All of these operations are normally done using the disklabel program. RELATED INFORMATION
Files: disktab(4) Commands: disklabel(8) delim off disklabel(4)
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