How to resize LVM logical volume

[daniele]

1) Use resize2fs to increase and decrease a filesystem size
http://fibrevillage.com/storage/315-use ... ystem-size

2) Removing a Disk from a Logical Volume
https://access.redhat.com/documentation ... _remove_ex

3) LVM Resize – How to Decrease an LVM Partition
https://www.rootusers.com/lvm-resize-ho ... partition/


Use lvresize to resize both lv and filesystem size
The following command will shrink reduce by 10GB the size of both the logical volume and the filesystem:

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lvresize -r -L -10g /dev/mapper/vg0-lvol0

Check what (and how much) physical disks are being used in a volume group

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pvs -o+pv_used

Remove a physical disk (/dev/sdb1) from a volume group (myvg)

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vgreduce myvg /dev/sdb1

Identify a virtual disk (i.e. a VHD or a VMDK) no more in use and safely remove it from the hypervisor
In modern Linux distros you can use this command to.

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sudo ls /sys/block/sd*/device/*

For instance you could have results similar to the following:

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/sys/block/sdj/device/scsi_device:
1:0:0:6

From that info you will be able to know that the disk sdj is attached to the controller (either physical or virtual) 1 at number 6