Logical Volume Fields
---------------------
lv_all - All fields in this section.
lv_uuid - Unique identifier.
lv_name - Name. LVs created for internal use are enclosed in brackets.
lv_path - Full pathname for LV.
lv_attr - Various attributes - see man page.
lv_major - Persistent major number or -1 if not persistent.
lv_minor - Persistent minor number or -1 if not persistent.
lv_read_ahead - Read ahead setting in current units.
lv_kernel_major - Currently assigned major number or -1 if LV is not active.
lv_kernel_minor - Currently assigned minor number or -1 if LV is not active.
lv_kernel_read_ahead - Currently-in-use read ahead setting in current units.
lv_size - Size of LV in current units.
lv_metadata_size - For thin pools, the size of the LV that holds the metadata.
seg_count - Number of segments in LV.
origin - For snapshots, the origin device of this LV.
origin_size - For snapshots, the size of the origin device of this LV.
data_percent - For snapshot and thin pools and volumes, the percentage full if LV is active.
snap_percent - For snapshots, the percentage full if LV is active.
metadata_percent - For thin pools, the percentage of metadata full if LV is active.
copy_percent - For mirrors and pvmove, current percentage in-sync.
move_pv - For pvmove, Source PV of temporary LV created by pvmove.
convert_lv - For lvconvert, Name of temporary LV created by lvconvert.
mirror_log - For mirrors, the LV holding the synchronisation log.
data_lv - For thin pools, the LV holding the associated data.
metadata_lv - For thin pools, the LV holding the associated metadata.
pool_lv - For thin volumes, the thin pool LV for this volume.
lv_tags - Tags, if any.
lv_time - Creation time of the LV, if known
lv_host - Creation host of the LV, if known.
modules - Kernel device-mapper modules required for this LV.
Physical Volume Label Fields
----------------------------
pv_all - All fields in this section.
pv_fmt - Type of metadata.
pv_uuid - Unique identifier.
dev_size - Size of underlying device in current units.
pv_name - Name.
pv_mda_free - Free metadata area space on this device in current units.
pv_mda_size - Size of smallest metadata area on this device in current units.
Physical Volume Fields
----------------------
pv_all - All fields in this section.
pe_start - Offset to the start of data on the underlying device.
pv_size - Size of PV in current units.
pv_free - Total amount of unallocated space in current units.
pv_used - Total amount of allocated space in current units.
pv_attr - Various attributes - see man page.
pv_pe_count - Total number of Physical Extents.
pv_pe_alloc_count - Total number of allocated Physical Extents.
pv_tags - Tags, if any.
pv_mda_count - Number of metadata areas on this device.
pv_mda_used_count - Number of metadata areas in use on this device.
Volume Group Fields
-------------------
vg_all - All fields in this section.
vg_fmt - Type of metadata.
vg_uuid - Unique identifier.
vg_name - Name.
vg_attr - Various attributes - see man page.
vg_size - Total size of VG in current units.
vg_free - Total amount of free space in current units.
vg_sysid - System ID indicating when and where it was created.
vg_extent_size - Size of Physical Extents in current units.
vg_extent_count - Total number of Physical Extents.
vg_free_count - Total number of unallocated Physical Extents.
max_lv - Maximum number of LVs allowed in VG or 0 if unlimited.
max_pv - Maximum number of PVs allowed in VG or 0 if unlimited.
pv_count - Number of PVs.
lv_count - Number of LVs.
snap_count - Number of snapshots.
vg_seqno - Revision number of internal metadata. Incremented whenever it changes.
vg_tags - Tags, if any.
vg_mda_count - Number of metadata areas on this VG.
vg_mda_used_count - Number of metadata areas in use on this VG.
vg_mda_free - Free metadata area space for this VG in current units.
vg_mda_size - Size of smallest metadata area for this VG in current units.
vg_mda_copies - Target number of in use metadata areas in the VG.
Logical Volume Segment Fields
-----------------------------
seg_all - All fields in this section.
segtype - Type of LV segment.
stripes - Number of stripes or mirror legs.
stripesize - For stripes, amount of data placed on one device before switching to the next.
stripe_size - For stripes, amount of data placed on one device before switching to the next.
regionsize - For mirrors, the unit of data copied when synchronising devices.
region_size - For mirrors, the unit of data copied when synchronising devices.
chunksize - For snapshots, the unit of data used when tracking changes.
chunk_size - For snapshots, the unit of data used when tracking changes.
thin_count - For thin pools, the number of thin volumes in this pool.
zero - For thin pools, if zeroing is enabled.
transaction_id - For thin pools, the transaction id.
seg_start - Offset within the LV to the start of the segment in current units.
seg_start_pe - Offset within the LV to the start of the segment in physical extents.
seg_size - Size of segment in current units.
seg_tags - Tags, if any.
seg_pe_ranges - Ranges of Physical Extents of underlying devices in command line format.
devices - Underlying devices used with starting extent numbers.
Physical Volume Segment Fields
------------------------------
pvseg_all - All fields in this section.
pvseg_start - Physical Extent number of start of segment.
pvseg_size - Number of extents in segment.
