I'm not sure if this will give you the exact data you're looking for, but a lot of information can be collected using lvs, for example:
sudo lvs -o +cache_used_blocks,writecache_total_blocks,cache_read_hits,cache_read_misses,cache_write_hits,cache_write_misses
You can get the list of all options with lvs -o help:
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_full_name - Full name of LV including its VG, namely VG/LV. lv_path - Full pathname for LV. Blank for internal LVs. lv_dm_path - Internal device-mapper pathname for LV (in /dev/mapper directory). lv_parent - For LVs that are components of another LV, the parent LV. lv_layout - LV layout. lv_role - LV role. lv_initial_image_sync - Set if mirror/RAID images underwent initial resynchronization. lv_image_synced - Set if mirror/RAID image is synchronized. lv_merging - Set if snapshot LV is being merged to origin. lv_converting - Set if LV is being converted. lv_allocation_policy - LV allocation policy. lv_allocation_locked - Set if LV is locked against allocation changes. lv_fixed_minor - Set if LV has fixed minor number assigned. lv_skip_activation - Set if LV is skipped on activation. lv_autoactivation - Set if LV autoactivation is enabled. lv_when_full - For thin pools, behavior when full. lv_active - Active state of the LV. lv_active_locally - Set if the LV is active locally. lv_active_remotely - Set if the LV is active remotely. lv_active_exclusively - Set if the LV is active exclusively. 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_size - Size of LV in current units. lv_metadata_size - For thin and cache pools, the size of the LV that holds the metadata. seg_count - Number of segments in LV. origin - For snapshots and thins, the origin device of this LV. origin_uuid - For snapshots and thins, the UUID of origin device of this LV. origin_size - For snapshots, the size of the origin device of this LV. lv_ancestors - LV ancestors ignoring any stored history of the ancestry chain. lv_full_ancestors - LV ancestors including stored history of the ancestry chain. lv_descendants - LV descendants ignoring any stored history of the ancestry chain. lv_full_descendants - LV descendants including stored history of the ancestry chain. raid_mismatch_count - For RAID, number of mismatches found or repaired. raid_sync_action - For RAID, the current synchronization action being performed. raid_write_behind - For RAID1, the number of outstanding writes allowed to writemostly devices. raid_min_recovery_rate - For RAID1, the minimum recovery I/O load in kiB/sec/disk. raid_max_recovery_rate - For RAID1, the maximum recovery I/O load in kiB/sec/disk. raidintegritymode - The integrity mode raidintegrityblocksize - The integrity block size integritymismatches - The number of integrity mismatches. move_pv - For pvmove, Source PV of temporary LV created by pvmove. move_pv_uuid - For pvmove, the UUID of Source PV of temporary LV created by pvmove. convert_lv - For lvconvert, Name of temporary LV created by lvconvert. convert_lv_uuid - For lvconvert, UUID of temporary LV created by lvconvert. mirror_log - For mirrors, the LV holding the synchronisation log. mirror_log_uuid - For mirrors, the UUID of the LV holding the synchronisation log. data_lv - For cache/thin/vdo pools, the LV holding the associated data. data_lv_uuid - For cache/thin/vdo pools, the UUID of the LV holding the associated data. metadata_lv - For cache/thin pools, the LV holding the associated metadata. metadata_lv_uuid - For cache/thin pools, the UUID of the LV holding the associated metadata. pool_lv - For cache/thin/vdo volumes, the cache/thin/vdo pool LV for this volume. pool_lv_uuid - For cache/thin/vdo volumes, the UUID of the cache/thin/vdo pool LV for this volume. lv_tags - Tags, if any. lv_profile - Configuration profile attached to this LV. lv_lockargs - Lock args of the LV used by lvmlockd. lv_time - Creation time of the LV, if known lv_time_removed - Removal time of the LV, if known lv_host - Creation host of the LV, if known. lv_modules - Kernel device-mapper modules required for this LV. lv_historical - Set if the LV is historical. writecache_block_size - The writecache block size Logical Volume Device Info Fields --------------------------------- lv_all - All fields in this section. 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_permissions - LV permissions. lv_suspended - Set if LV is suspended. lv_live_table - Set if LV has live table present. lv_inactive_table - Set if LV has inactive table present. lv_device_open - Set if LV device is open. Logical Volume Device Status Fields ----------------------------------- lv_all - All fields in this section. data_percent - For snapshot, cache 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 cache and thin pools, the percentage of metadata full if LV is active. copy_percent - For Cache, RAID, mirrors and pvmove, current percentage in-sync. sync_percent - For Cache, RAID, mirrors and pvmove, current percentage in-sync. cache_total_blocks - Total cache blocks. cache_used_blocks - Used cache blocks. cache_dirty_blocks - Dirty cache blocks. cache_read_hits - Cache read hits. cache_read_misses - Cache read misses. cache_write_hits - Cache write hits. cache_write_misses - Cache write misses. kernel_cache_settings - Cache settings/parameters as set in kernel, including default values (cached segments only). kernel_cache_policy - Cache policy used in kernel. kernel_metadata_format - Cache metadata format used in kernel. lv_health_status - LV health status. kernel_discards - For thin pools, how discards are handled in kernel. lv_check_needed - For thin pools and cache volumes, whether metadata check is needed. lv_merge_failed - Set if snapshot merge failed. lv_snapshot_invalid - Set if snapshot LV is invalid. vdo_operating_mode - For vdo pools, its current operating mode. vdo_compression_state - For vdo pools, whether compression is running. vdo_index_state - For vdo pools, state of index for deduplication. vdo_used_size - For vdo pools, currently used space. vdo_saving_percent - For vdo pools, percentage of saved space. writecache_total_blocks - Total writecache blocks. writecache_free_blocks - Total writecache free blocks. writecache_writeback_blocks - Total writecache writeback blocks. writecache_error - Total writecache errors. Logical Volume Device Info and Status Combined Fields ----------------------------------------------------- lv_all - All fields in this section. lv_attr - Various attributes - see man page. 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_major - Device major number. pv_minor - Device minor number. 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. pv_ext_vsn - PV header extension version. 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_allocatable - Set if this device can be used for allocation. pv_exported - Set if this device is exported. pv_missing - Set if this device is missing in system. 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. pv_ba_start - Offset to the start of PV Bootloader Area on the underlying device in current units. pv_ba_size - Size of PV Bootloader Area in current units. pv_in_use - Set if PV is used. pv_duplicate - Set if PV is an unchosen duplicate. pv_device_id - Device ID such as the WWID. pv_device_id_type - Type of device ID such as WWID. 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_permissions - VG permissions. vg_extendable - Set if VG is extendable. vg_exported - Set if VG is exported. vg_autoactivation - Set if VG autoactivation is enabled. vg_partial - Set if VG is partial. vg_allocation_policy - VG allocation policy. vg_clustered - Set if VG is clustered. vg_shared - Set if VG is shared. vg_size - Total size of VG in current units. vg_free - Total amount of free space in current units. vg_sysid - System ID of the VG indicating which host owns it. vg_systemid - System ID of the VG indicating which host owns it. vg_lock_type - Lock type of the VG used by lvmlockd. vg_lock_args - Lock args of the VG used by lvmlockd. 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 in VG. vg_missing_pv_count - Number of PVs in VG which are missing. 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_profile - Configuration profile attached to this VG. 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/raid1 legs. data_stripes - Number of data stripes or mirror/raid1 legs. reshape_len - Size of out-of-place reshape space in current units. reshape_len_le - Size of out-of-place reshape space in logical extents. data_copies - Number of data copies. data_offset - Data offset on each image device. new_data_offset - New data offset after any reshape on each image device. parity_chunks - Number of (rotating) parity chunks. stripe_size - For stripes, amount of data placed on one device before switching to the next. region_size - For mirrors/raids, the unit of data per leg when synchronizing devices. 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. discards - For thin pools, how discards are handled. cache_metadata_format - For cache, metadata format in use. cache_mode - For cache, how writes are cached. zero - For thin pools and volumes, if zeroing is enabled. transaction_id - For thin pools, the transaction id and creation transaction id for thins. thin_id - For thin volume, the thin device 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_size_pe - Size of segment in physical extents. seg_tags - Tags, if any. seg_pe_ranges - Ranges of Physical Extents of underlying devices in command line format (deprecated, use seg_le_ranges for common format). seg_le_ranges - Ranges of Logical Extents of underlying devices in command line format. seg_metadata_le_ranges - Ranges of Logical Extents of underlying metadata devices in command line format. devices - Underlying devices used with starting extent numbers. metadata_devices - Underlying metadata devices used with starting extent numbers. seg_monitor - Dmeventd monitoring status of the segment. cache_policy - The cache policy (cached segments only). cache_settings - Cache settings/parameters (cached segments only). vdo_compression - Set for compressed LV (vdopool). vdo_deduplication - Set for deduplicated LV (vdopool). vdo_use_metadata_hints - Use REQ_SYNC for writes (vdopool). vdo_minimum_io_size - Minimum acceptable IO size (vdopool). vdo_block_map_cache_size - Allocated caching size (vdopool). vdo_block_map_era_length - Speed of cache writes (vdopool). vdo_use_sparse_index - Sparse indexing (vdopool). vdo_index_memory_size - Allocated indexing memory (vdopool). vdo_slab_size - Increment size for growing (vdopool). vdo_ack_threads - Acknowledging threads (vdopool). vdo_bio_threads - IO submitting threads (vdopool). vdo_bio_rotation - IO enqueue (vdopool). vdo_cpu_threads - CPU threads for compression and hashing (vdopool). vdo_hash_zone_threads - Threads for subdivide parts (vdopool). vdo_logical_threads - Logical threads for subdivide parts (vdopool). vdo_physical_threads - Physical threads for subdivide parts (vdopool). vdo_max_discard - Maximum discard size volume can recieve (vdopool). vdo_write_policy - Specified write policy (vdopool). vdo_header_size - Header size at front of vdopool. 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. Special Fields -------------- selected - Set if item passes selection criteria. help - Show help. ? - Show help.
