Performance metadata for storage systems that run IBM Storage Virtualize

View the lists of the performance metadata for IBM SAN Volume Controller, IBM Storage Virtualize for Public Cloud, IBM Storage Virtualize as Software Only, IBM Storwize storage systems, and for IBM Storage FlashSystem devices that run IBM Storage Virtualize.

Overview

The performance metadata is divided into the following categories:

Volume metadata

The following key metadata is collected for volume performance:
  • Data Rate (Read, Total, Unmap, Write)
  • Overall Host Attributed Response Time Percentage
  • Overall I/O Rate (Read, Total, Unmap, Write)
  • Pool Activity Score
  • Response Time (Overall, Read, Unmap, Write)
  • Volume Utilization
  • Write Cache Delay Percentage
The following I/O rate metadata is collected for volume performance:
  • Transfer Rate (Cache-to-Disk, Disk-to-Cache)
  • Unaligned Unmap I/O Rate
  • Write-Cache Delay I/O Rate
The following cache hit percentage metadata is collected for volume performance:
  • Overall I/O Cache Hits (Read, Total, Write)
The following response time metadata is collected for volume performance:
  • Peak Response Time (Read, Unmap, Write)
The following remote mirror metadata is collected for volume performance:
  • Global Mirror (Overlapping Write I/O Rate, Overlapping Write Percentage, Secondary Write Lag, Write I/O Rate)
The following volume cache metadata is collected for volume performance:
  • Cache Hits (Dirty Writes, Read, Total, Write)
  • I/O Rate (Destage, Read, Total, Write)
  • Response Time (Destage, Stage)
  • Transfer Rates (Cache-to-Disk, Disk-to-Cache)
  • Write Delay Percentage (Flush-through, Total Delay, Write-through)
  • Write Delay Rate (Flush-through, Total Delay, Write-through)

  • Data Rate (Fast-Write Writes)

The following volume copy cache metadata is collected for volume performance:
  • Cache Hits (Dirty Writes, Read, Read-ahead, Total, Write)
  • I/O Rate (Destage, Prestage, Stage, Total)
  • Response Time (Destage, Prestage, Stage)
  • Transfer Rates (Cache-to-Disk, Disk-to-Cache)
  • Write Delay Percentage (Flush-through, Total Delay, Write-through)
  • Write Delay Rate (Flush-through, Total Delay, Write-through)

  • Data Rate (Fast-Write Writes)

The following compression metadata is collected for volume performance:
  • Compressed Volumes (Data Rate, I/O Rate, Response Time)
  • Uncompressed Volumes (Data Rate, I/O Rate, Response Time)
The following miscellaneous metadata is collected for volume performance:
  • Cache to Host Transfer Response Time
  • Non-Preferred Node Usage Percentage
  • Transfer Size (Overall, Read, Write)
  • Unaligned Write I/O Rate
The following legacy cache metadata is collected for volume performance:
  • Dirty Write Percentage of Cache Hits
  • Write-Cache I/O Rate (Flush-through, Overflow, Write-through)
  • Write-Cache Percentage (Flush-through, Overflow, Write-through)

Disk metadata

The following key metadata is collected for disk performance:
  • Data Rate (Read, Total, Write)
  • I/O Rate (Read, Total, Write)
  • Response Time (Overall, Read, Write)
The following response time metadata is collected for disk performance:
  • Peak Back-end Response Time (Read, Write)
  • Peak Back-end Queue Time (Read, Write)
  • Queue Time (Overall, Read, Write)
The following miscellaneous metadata for disk performance:
  • Cache Destage (In-Flight I/O, Target I/O)
  • Transfer Size (Overall, Read, Write)

Pool metadata

The following key metadata is collected for pool performance:
  • Max Write Cache Fullness
  • Write Cache Fullness

Port metadata

The following key metadata is collected for port performance:
  • Data Rate (Receive, Send, Total)
  • I/O Rate (Receive, Send, Total)
The following I/O rate metadata is collected for port performance:
  • Port-to-Disk I/O Rate (Receive, Send, Total)
  • Port-to-Host I/O Rate (Receive, Send, Total)
  • Port-to-Local Node I/O Rate (Receive, Send, Total)
  • Port-to-Remote Node I/O Rate (Receive, Send, Total)
The following data rate metadata is collected for port performance:
  • Port-to-Disk Data Rate (Receive, Send, Total)
  • Port-to-Host Data Rate (Receive, Send, Total)
  • Port-to-Local Node Data Rate (Receive, Send, Total)
  • Port-to-Remote Node Data Rate (Receive, Send, Total)
The following response time metadata is collected for port performance:
  • Port-to-Local Node Response Time (Overall, Receive, Send)
  • Port-to-Remote Node Response Time (Overall, Receive, Send)
The following error rate metadata is collected for port performance:
  • Frame Errors (CRC Error Rate)
  • Link Errors (Invalid Link Transmission Rate, Invalid Transmission Word Rate, Link Failure Rate, Primitive Sequence Protocol Error Rate, Loss of Signal Rate, Loss of Sync Rate)
  • Port Congestion Index
  • Port Protocol Errors (Port Send Delay I/O Percentage, Port Send Delay Time, Zero Buffer Credit Percentage, Zero Buffer Credit Timer)
The following miscellaneous metadata is collected for port performance:
  • Port-to-Local Node Queue Time (Overall, Receive, Send)
  • Port-to-Remote Node Queue Time (Overall, Receive, Send)

Node metadata

The following metadata is collected for node performance:
  • Cache Fullness (Max Read Cache Fullness, Max Write Cache Fullness, Read Cache Fullness, Write Cache Fullness)
  • Compression CPU Utilization (Core 1 to Core 8)
  • CPU Utilization (Compression CPU, System CPU)
  • Garbage Collection (Data Movement Rate, Data Rewrite Rate, Extent Collection Rate, New Address Write Rate, Reclaimable Capacity, Recovered Capacity Rate)
  • Node Utilization by Node
  • System CPU Utilization (Core 1 to Core 48)