*** UNIX MANUAL PAGE BROWSER ***

lvreduce(8) System Manager's Manual lvreduce(8) NAME lvreduce - Decreases the number of physical extents allocated to a log- ical volume SYNOPSIS /usr/sbin/lvreduce -m MirrorCopies | -l LogicalExtentsNumber [-f] Logi- calVolumePath DESCRIPTION This command is no longer supported on Digital UNIX systems. Features formerly provided by the Logical Volume Manager (LVM) are now provided by the Logical Storage Manager (LSM). Existing LVM volumes must be mi- grated to LSM, using an encapsulation process. For information about moving LVM volumes to LSM, see the vollvmencap(8) reference page and the manual Logical Storage Manager. The lvreduce command changes either the number of logical extents allo- cated to a logical volume specified with the LogicalVolumePath parame- ter or the number of physical extents allocated to each logical extent in the logical volume. The change is determined according to which command flags you use. FLAGS Forces the reduction of the number of logical extents without first re- questing confirmation. This option can be used only if the -l flag has been used. Sets the number of physical extents allocated for each log- ical extent. MirrorCopies (that is, mirrors) can be either 0 or 1. This means that beyond the original copy, no other (0) or one (1) mirror copy will con- tain the same data as the original copy. MirrorCopies must be less than the current number of mirrors for the logical volume. Either this option or the -l option must be supplied. Decreases the number of logical extents allocated to the LogicalVol- umePath. LogicalExtentsNumber must be less than the number of logical extents previously allocated to LogicalVolumePath. LogicalExtentsNumber represents the new total number of logical extents within LogicalVolumePath. The change is accomplished by deallocating the number of logical extents represented by the difference between the previous number of extents and LogicalExtentsNumber. The lvreduce command asks for confirmation if you do not use the -f flag. You must use either this option (-l) or the -m option. EXAMPLES To decrease the number of the logical extents of logical volume lv03 to one hundred, enter: lvreduce -l 100 /dev/vg01/lv03 To get one mirror (that is, two copies) for each logical extent of logical volume lv05, enter: lvreduce -m 1 /dev/vg01/lv05 Each logical extent of logical volume lv05 is now singly mirrored. CAUTIONS The Logical Volume Manager does not store any information about which physical extents contain useful data; therefore, using the -l option might lead to the loss of useful data. FILES Specifies the command path. RELATED INFORMATION Commands: lvcreate(8), lvdisplay(8), lvextend(8), pvchange(8), pvdis- play(8) delim off lvreduce(8)