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Measures reported by NetCluFlshDevTest
A Flash Cache 2, Flash Cache, or Performance Acceleration Module (PAM) PCIe-based, memory module optimizes the performance of random read-intensive workloads by functioning as an intelligent external read cache. This hardware works in tandem with the WAFL External Cache software component of Data ONTAP. Flash Cache speeds data access through intelligent caching of recently read user data or NetApp metadata. Flash Cache works with all NetApp storage protocols and software, enabling you to:
- Increase I/O throughput by up to 75% thus eliminating performance bottlenecks
- Use up to 75% fewer disk drives without compromising performance
- Increase e-mail users by up to 67% without adding disk drives
- Lower costs—use SATA drives with Flash Cache for important workloads.
- Save power, cooling & rack space by using fewer, larger hard disk drives.
This test monitors the current state of each Flash Cache installed on the NetApp Cluster and reports the percentage of Flash Cache that is currently online.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| Status |
Indicates the current state of this Flash Cache. |
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The values that this measure can report and their corresponding numeric values have been listed in the table below.
| Measure Value |
Numeric Value |
| Online |
0 |
| Offline_failed |
1 |
| Offline_threshold |
2 |
Note:
By default, this measure reports the above-mentioned Measure Values while indicating the current status of a Flash Cache. However, in the graph of this measure, states will be represented using the corresponding numeric equivalents i.e., 0 to 2.
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| Per_online |
Indicates the percentage of Flash Cache capacity that is currently online. |
Percent |
A high value is desired for this measure. |
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