Dell Acceleration Appliances for Databases - Manual (Page 53)

ION Accelerator Performance – Operations (IOPS)
When you switch between ioMemory modules or network adapters, the software will pause
to regenerate the performance data.
Interpreting Performance Figures
The performance figures viewed in ION Accelerator based directly on the number of reads and
writes made to individual ioMemory devices, not on reads and writes being made to a storage
pool or volume. When reading live performance data, it is important to remember that writes can
be duplicated many times across different drives in a RAIDset, and reads can be divided among
multiple devices in the same RAIDset. Additionally, writes are duplicated across nodes in an HA
configuration, so it is important to take into account your current ION Accelerator configuration.
For example, suppose you have an HA cluster with one volume on a RAID 1 storage pool. Every
write to the volume will be duplicated first between each node in the cluster, and then to each
drive in the RAID. The result would be a total of 4x the number of writes across the whole
appliance, compared to the number made in a standalone system in Direct Access mode.
LIVE VIEW
The Live View is a powerful tool for seeing real-time performance statistics within your ION
Accelerator appliance. The following performance metrics are available:
• Read and write bandwidth, in MB/s
• Read and write IOPS
• Average bandwidth and IOPS statistics over time
• Temperature, in degrees Celsius
• Current RAM usage
• Peak RAM usage
• Petabytes written (PBW) endurance
• Reserve space available
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