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Sun ZFS Storage 7000 System Administration Guide |
Data Movement NDMP bytes transferred tofrom disk
Data Movement: NDMP bytes transferred to/from disk
Data Movement NDMP bytes transferred tofrom tape
Data Movement: NDMP bytes transferred to/from tape
Data Movement Shadow migration bytes
Data Movement: Shadow migration bytes
Data Movement Shadow migration ops
Data Movement: Shadow migration ops
Data Movement Shadow migration requests
Data Movement: Shadow migration requests
Protocol Fibre Channel operations
Protocol: Fibre Channel operations
Protocol: HTTP/WebDAV requests
Data Movement NDMP file system operations
Data Movement: NDMP file system operations
Disk ZFS logical IO operations
Disk: ZFS logical I/O operations
Memory Kernel memory lost to fragmentation
Memory: Kernel memory lost to fragmentation
This statistic shows average utilization across all disks. The per-disk breakdown shows the utilization that that disk contributed to the total average, not the utilization of that disk.
This statistic may be useful to trigger an alert based on the average for all disks.
Investigating disk utilization is usually much more effective using the standard Analytics statistic Disk: Disks broken down by percent utilization - which instead of averaging utilization, presents it as a heat map. This allows individual disk utilization to be examined.
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The disk breakdown shows the contribution to the average percent which each disk made.
A system with 100 disks would never show more than 1 for any disk breakdown, unless that disk was selected and displayed separately as a raw statistic. Such a system would also show 0 percent utilization for disks less than 50% busy, due to rounding. Since this may be a source of confusion, and that there is a better statistic available for most situations (Disk: Disks), this statistic has been placed in the Advanced category.
See Disk: Disks broken down by percent utilization for a different and usually more effective way to display this data.
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