Tiered storage performance metrics

Storage tier metrics allow drilling down into specific storage tiers for a table to monitor the data distribution.

To view a storage metric, a table and tier number must be specified. DSE identifies tiers by number. Zero represents the tier with the newest data. The number increases by one for each older tier.

An additional implicit tier exists that represents the oldest data. For instance, if max_tier_ages for a table is set to 60,120, there are three tiers: Tier 0 would be for data newer than 60 seconds, tier 1 would be for data between 60 seconds and 120 seconds, and tier 2 would be for data older than 120 seconds.

For more information, see DSE Tiered Storage.

  • TIER: Max Data Age [cf-tier-max-data-age]

    Timestamp in local server time that represents an upper bound to the newest piece of data stored in the SSTable. When a new SSTable is flushed, it is set to the time of creation. When an SSTable is created from compaction, it is set to the max of all merged SSTables.

  • TIER: sstables [cf-tier-sstables]

    Number of SSTables in a tier for a table.

  • TIER: Total Disk Used [cf-tier-size]

    Disk space used by a table by SSTables for the tier.