Capacity by pool
Monitor the capacity, fill rate %, and growth rate for your pools. IBM Storage Insights Pro users can also check, when they set a capacity limit for pools, the amount of capacity that is left before the pools reach the capacity limit.
- Adjusted Used Capacity (%)
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The amount of capacity that can be used without exceeding the capacity limit.
The formula for calculating Adjusted Used Capacity (%) is (Used Capacity in GiB/Capacity Limit in GiB )*100. For example, if the capacity is 100 GiB, the used capacity is 40 GiB, and the capacity limit is 80% or 80 GiB, then the value for Adjusted Used Capacity (%) is (40 GiB/80 GiB )* 100 or 50%. So, in this example, you can use 30% or 40 GiB of the usable capacity of the resource before you reach the capacity limit.
If the used capacity exceeds the capacity limit, the value for Adjusted Used Capacity (%) is over 100%.
To add the Adjusted Used Capacity (%) column, right-click any column heading on the Pools page.
See these related values for more information Capacity Limit (%) and Capacity-to-Limit (GiB).
- Available Capacity (GiB)
- The amount of usable capacity that is not yet used in the pool.
- Capacity (GiB)
- The amount of capacity that is available for storing data in the pool after formatting and RAID techniques are applied.
- Capacity Limit (%) and Capacity Limit (GiB)
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The limit that was set on the capacity that is used by your pools. For example, the policy of your company is to keep 20% of the usable capacity of your pools in reserve. So, you log into the GUI as Administrator and set the capacity limit of your pools to 80%.
Click the illustration above
to find out how to set capacity limits.The GiB value for the capacity limit for the pool is calculated when you set the value for the Capacity Limit (%).
To add the Capacity Limit (%) and the Capacity Limit (GiB) columns, right-click any column heading on the Pools page.
See these related values for more information Adjusted Used Capacity (%) and Capacity-to-Limit (GiB).
Zero capacity: When you set the capacity limit for pools, the values shown for Zero Capacity are readjusted to take into account the capacity limit of the pool. The date will represent when the capacity limit of the pool is reached. If the pool has already reached the capacity limit, Depleted is shown. None is shown when a trend in storage consumption can't be detected because the pool's storage isn't being consumed or because not enough data was collected to predict storage consumption. - Capacity-to-Limit (GiB)
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The amount of capacity that is available before the capacity limit is reached.
The formula for calculating Capacity-to-Limit (GiB) is (Capacity Limit in GiB - Used Capacity in GiB). For example, if the capacity limit is 80% or 80 GiB and the used capacity is 40 GiB, then the value for Capacity-to-Limit (GiB) is (80 GiB - 40 GiB or 80% - 50%) which is 30% or 40 GiB.
See these related values for more information Capacity Limit (%) and Adjusted Used Capacity (%).
This metric is not available for all storage systems, such as IBM FlashSystem A9000, IBM FlashSystem A9000R, and Dell EMC VMAX.
- Used Capacity (GiB) and Used Capacity (%)
- The amount of usable capacity that is taken up by the data in the pool after data reduction techniques have been applied.
- Recent Fill Rate (%)
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The rate at which the capacity of the pool is being consumed over the last 30 days. Use this value to see how quickly your pools are filling up.
If insufficient historical data is available to calculate the Recent Fill Rate (%), it is the difference between today's fill rate % and the oldest value for the fill rate % that can be calculated in the last 30 days.
- Recent Growth (GiB)
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The growth in used capacity over the last 30 days. Use this value to identify the pools with the highest growth in storage consumption.
Recent growth is the difference between the current used capacity for the pool and the used capacity for the pool that was reported 30 days ago. If insufficient historical data is available, it is the difference between the current used capacity for the pool and the oldest value for the used capacity of the pool that was reported in the last 30 days.
- Tier Distribution (%)
- For storage systems that support Easy Tier®, the distribution of the capacity of the volume extents across each drive class or tier.