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Top Forums UNIX for Beginners Questions & Answers Safe way to shrink lvm vg_*-lv_swap partition and reclaim freed space on Linux? Post 303039335 by MadeInGermany on Tuesday 1st of October 2019 06:12:47 AM
Old 10-01-2019
Releasing a certain logical disk is easy: just swapoff it (that can take some time if swap is in use - the swapped blocks need to be shuffled into RAM).
Then you can lvresize it.
Then swapon -v it - it will see the new size.

To grow (and shrink) a filesystem, lvresize --resizefs --size ... seems to be most easy (but I have never used it).
Code:
man lvresize

and the --resizefs option points to
Code:
man fsadm

 

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dtc_setup_vps_disks(8)					      System Manager's Manual					    dtc_setup_vps_disks(8)

NAME
dtc_setup_disk - setup LVM disks for using it as a VM SYNOPSIS
dtc_setup_vps_disk.sh VPS_NUMBER HDD_SIZE SWAP_SIZE [ lvm|loopback ] DESCRIPTION
dtc_setup_vps_disk.sh This shell script is a part of the dtc-xen package that is to be used by the dtc panel to manage a Xen VPS server. This script is used to create partitions to be used by a VPS later on. It will create a normal partition that will be used as a root disk, and a swap partition. dtc_setup_disk is to be used by the dtc-xen SOAP server, but can also be used as a standalone userland tool. If the partition(s) exists, then this script will delete it/them first. OPTIONS
VPS_NUMBER has to be a number between 01 and 19. Let's say the number is 16, and that dtc-xen is configured to use the volume group called lvm1, then this script will create /dev/lvm1/xen16 and /dev/lvm1/xen16swap. HDD_SIZE Size in MB of the VPS partition to create. SWAP_SIZE Size in MB of the VPS swap partition to create. If the dtc-xen SOAP server is used to create the VPS, then it will create a swap partition of the exact same size as the memory. IMAGE_TYPE This parameter can have 2 values: either lvm or loopback. If ommited, then lvm is used. If lvm is used, then this script will create a partition using lvmcreate, otherwise it will create an image file. Both will later be used for the VPS. EXAMPLE
dtc_setup_vps_disk 04 15360 256 lvm This will create 2 LVM partition to be used by the VPS named xen04, the first one being a root partition of 15 GB, and the second one being a swap partition of 256 MB. VERSION
This documentation describes dtc_setup_vps_disk version 0.3.15. See http://www.gplhost.com/software-dtc-xen.html for updates. SEE ALSO
dtc_reinstall_os(8), dtc_kill_vps_disk(8) dtc_setup_vps_disks(8)
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