Memory and Storage Monitoring
This article refers to two distinct types of computer data storage facilities: memory (RAM, etc.) and persistent storage (hard disk drives, optical discs, etc.).
Storage monitoring data is obtained using SNMP and WMI.
Via SNMP, hrStorageTable SNMP table is utilized to get detailed information about logical storage volumes on the host, including their types, descriptions, total and free sizes, allocation units, etc.
Via WMI, Iotellect Network Manager uses the following classes:
Win32_PerfFormattedData_PerfOS_Memoryto monitor memoryWin32_LogicalDiskto monitor persistent storage.
Iotellect Network Manager comprises the following storage monitoring tools:
- Storage Usage (SNMP) chart
- Memory Usage Top 10 (SNMP) charts
- Memory Usage reports/queries
- Disk Volumes Utilization Top 10 (SNMP) charts
- Disk Volumes Utilization reports/queries
- Disk Volumes Free Space reports/queries
- Memory Usage Top 10 Auto Run action that shows ten volumes with the highest load
 | The Storage Space alerts and Storage Usage chart can be created and configured using Setup Monitoring Profile action -- see Storage Volumes group in Setup Monitoring Profile . |
Storage utilization of VMware virtual machines can be monitored using VMware Server monitoring tools, namely:
- Virtual Machine Disk Performance chart
- Virtual Machine Memory Usage chart
- Virtual Machine Absolute Memory Utilization alert
- Virtual Machine Relative Memory Utilization alert
- Virtual Machine HDD Read Rate alert
- Virtual Machine HDD Write Rate alert
Memory Alerting
Alert Name | Triggering Condition | Notes |
Memory (WMI) | Memory usage indicator satisfies a condition consisting of a threshold and comparison operation. The following indicators are available: Available Physical Memory (bytes), File System Cache Size (bytes), Number of Cache Faults per Second, Number of Page Faults per Second, Number of Pages Read from Disk to Resolve Hard Page Faults, Number of Pages Written to Disk to Free Physical Memory, Disk Read Operations to Free Physical Memory, Disk Write Operations to Resolve Hard Page Faults. | Use Setup Monitoring Profile action, Storage Volumes group to create; available for WMI-compliant devices only. |
Storage Alerting
Alert Name | Triggering Condition | Notes |
Storage Space (SNMP) | Percentage of used space on the specified storage volume exceeds the specified threshold. | The alert can be created using Setup Monitoring Profile action (Storage Volumes group); available for SNMP-compliant devices only. |
Disk Free Space (WMI) | Percentage of free disk space satisfies a condition consisting of a threshold and comparison operation. | Use Setup Monitoring Profile action, Storage Volumes group to create; available for WMI-compliant devices only. |
Memory Reporting
Report/Query Class | Report/Query Name | Description |
Memory Usage | Memory Usage Summary | Physical memory usage percentage for all devices |
Memory Usage Over 75% | Devices with memory usage percentage exceeding 75% | |
Memory Usage Over 90% | Devices with memory usage percentage exceeding 90% | |
Memory Usage Top 10 | 10 devices with the highest memory usage percentage | |
Memory Usage Top 50 | 50 devices with the highest memory usage percentage |
Storage Reporting
Report/Query Class | Report/Query Name | Description |
Disk Volumes Utilization | Disk Volumes Utilization Summary | Disk space usage percentage for all devices |
Disk Volumes Utilization Over 75% | Devices with disk space usage percentage exceeding 75% | |
Disk Volumes Utilization Over 90% | Devices with disk space usage percentage exceeding 90% | |
Disk Volumes Utilization Top 10 | Disk space usage percentage for top 10 devices | |
Disk Volumes Utilization Top 50 | Disk space usage percentage for top 50 devices | |
Disk Volumes Free Space | Disk Volumes Free Space Top 10 | 10 devices with the highest disk space usage percentage |
Disk Volumes Free Space Top 50 | 50 devices with the highest disk space usage percentage |
Memory Usage Charting
Chart Name | Description | Notes |
Memory and Disk Space Usage (SNMP) | Diagrams usage percentage of storage areas on the host, including physical memory, virtual memory, and disk space. | The chart can be created for a particular SNMP-enabled context using Setup Monitoring Profile action. |
Memory Usage Top 10 (SNMP) | Presents devices with the greatest memory usage. | The chart is automatically created by a corresponding auto run action in Top 10 group and is available at Top 10 dashboard. |
Storage Usage Charting
Chart Name | Description | Notes |
Disk Volumes Utilization Top 10 (SNMP) | Presents disk volumes and corresponding devices with the greatest utilization percentage. | The chart is automatically created by a corresponding auto run action in Top 10 group and is available at Top 10 dashboard. |
Memory Utilization Model
This model is attached to every network device. It declares generic Physical Memory, Virtual Memory and Swap Space variables and a rule set that calculates their value out of available device-specific memory metrics.
All other memory analysis tools (charts, reports, alerts, etc.) are based on this model.
Disk Utilization Model
This model is attached to every network device. It declares generic Disk Statistics variable and a rule set that calculates disk usage out of available device-specific disk metrics.
All other disk utilization analysis tools (charts, reports, alerts, etc.) are based on this model.
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