Total Efficiency Ratio and associated efficiency values

The total saving effect achieved by capacity saving, accelerated compression, Dynamic Provisioning, and snapshot is displayed as the Total Efficiency Ratio on the Pools window. System data (metadata and garbage data for the capacity saving function, Thin Image metadata) is not included in the Total Efficiency Ratio. The following examples show the relationship between the total efficiency and the efficiency achieved by each function.

Note
  • The total efficiency ratio and associated efficiency values do not include the total capacity and used capacity of the following volumes:
    • Journal volumes
    • Volumes with the data direct mapping attribute
    • Command devices
    • Deduplication system data volumes (fingerprint and data store)
    • Thin Image S-VOLs
    • Quorum disks
    • Remote command devices
  • When a pool is blocked, the values before the pool is blocked are displayed, and the value is updated after the pool is restored.
  • When any of the following operations is performed, the Total Efficiency Ratio and associated values displayed by HDvM - SN and CCI might be lower than the actual values:
    • Creating LDEVs or increasing the LDEV capacity
    • Initializing duplicated data
    • Reclaiming zero data page
    • Deleting or formatting LDEVs
    • Creating Thin Image snapshots
    • Deleting Thin Image S-VOLs
  • The Total Efficiency Ratio and associated efficiency values change according to configuration changes and the type of I/O load. The efficiency values are more accurate when I/O loads are not high. You might obtain lower values immediately after performing operations.
  • If data is written across the DP-VOL, the Total Efficiency Ratio might become less than 1.
  • It takes up to 90 minutes to calculate the Total Efficiency Ratio and associated efficiency values.

Example for deduplication and accelerated compression

The following figures illustrate the Total Efficiency Ratio, Software Saving Ratio, and FMD Saving Ratio values achieved when deduplication and accelerated compression are used. In these figures, items enclosed by the square brackets are displayed by HDvM - SN, and items with an asterisk are displayed using CCI.

Figure 1: Total Efficiency Ratio for deduplication and accelerated compression
illustration showing Total Efficiency Ratio with deduplication and accelerated compression
Figure 2: Software Saving Ratio for deduplication and accelerated compression
illustration showing Software Saving Ratio with deduplication and accelerated compression
Figure 3: FMD Saving Ratio for deduplication and accelerated compression
illustration showing FMD Saving Ratio with deduplication and accelerated compression

Example for deduplication and compression of the capacity saving function

The following figures illustrate the Total Efficiency Ratio and Software Saving Ratio achieved when deduplication and compression of the capacity saving function are used. In these figures, items enclosed by the square brackets are displayed by HDvM - SN, and items with an asterisk are displayed using CCI.

Figure 4: Total Efficiency Ratio for controller-based deduplication and compression
illustration showing total efficiency with deduplication and compression of capacity saving
Figure 5: Software Saving Ratio for controller-based deduplication and compression
illustration showing software saving with deduplication and compression of capacity saving

Efficiency values

The raidcom get system -key efficiency CCI command displays the efficiency values for the entire storage system, and the raidcom get pool -key efficiency CCI command displays the efficiency values for the specified pool.

Items output by CCI Corresponding item displayed by HDvM - SN
TOTAL_EFF_R Total Efficiency Ratio
TLS_R Data Reduction Ratio
PLS_R Software Saving Ratio
PLS_CMP_R Software Compression Ratio
PLS_DDP_R Software Deduplication Ratio
PLS_RECLAIM_R Software Pattern Matching Ratio
FMD_SAVING_R FMD Saving Ratio
FMD_CMP_R FMD Compression Ratio
FMD_RECLAIM_R FMD Pattern Matching Ratio
SNAPSHOT_EFF_R Snapshot Efficiency Ratio
PROVISIONING_EFF(%) Provisioning Efficiency (%)
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