18.5. Logical Volume Manager
LVM provides userspace tools that are used to manage the kernel's DM devices. LVM will shift the start of the data area (that a given DM device will use) to account for a non-zero
alignment_offset associated with any device managed by LVM. This means logical volumes will be properly aligned (
LVM will also detect the I/O hints for a device. The start of a device's data area will be a multiple of the
optimal_io_size exposed in sysfs. LVM will use the
optimal_io_size is undefined (i.e.
By default, LVM will automatically determine these I/O hints, but this behavior can be disabled by setting
/etc/lvm/lvm.conf. Disabling this is not recommended.