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Dell PowerVault ME4 Series Storage System CLI Guide

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show tier-statistics


Description	Shows live performance statistics for tiers. The command will show information for all tiers by default, or you can use parameters to filter the output. For tier performance statistics, the system samples live data every 30 seconds. Properties shown only in API format are described in API basetype properties
Minimum role	monitor
Syntax	show tier-statistics [pool `pool`] tier performance\|standard\|archive\|readcache\|all
Parameters	pool `pool` Optional. Specifies the name or serial number of the pool for which to show information. If this parameter is omitted, information is shown for all pools. tier performance\|standard\|archive\|readcache\|all Specifies the tier for which to show statistics.
Output	Pool The name of the pool. Tier The name of the tier. Pages Allocated per Min The rate, in pages per minute, at which pages are allocated to volumes in the tier because they need more space to store data. Pages Deallocated per Min The rate, in pages per minute, at which pages are deallocated from volumes in the tier because they no longer need the space to store data. Pages Reclaimed The number of 4 MB pages that have been automatically reclaimed and deallocated because they are empty (they contain only zeroes for data). Pages Unmapped per Minute The number of 4 MB pages that host systems have unmapped per minute, through use of the SCSI UNMAP command, to free storage space as a result of deleting files or formatting volumes on the host. Time Since Reset The amount of time, in seconds, since these statistics were last reset, either by a user or by a controller restart. Reads The number of read operations since these statistics were last reset or since the controller was restarted. Writes The number of write operations since these statistics were last reset or since the controller was restarted. Data Read The amount of data read since these statistics were last reset or since the controller was restarted. Data Written The amount of data written since these statistics were last reset or since the controller was restarted. Bps The data transfer rate, in bytes per second, calculated over the interval since these statistics were last requested or reset. This value will be zero if it has not been requested or reset since a controller restart. IOPS The number of input/output operations per second, calculated over the interval since these statistics were last requested or reset. This value will be zero if it has not been requested or reset since a controller restart. I/O Resp Time The average response time, in microseconds, for read and write operations since the last sampling time. Read Resp Time Shown by the all parameter. The average response time, in microseconds, for read operations since the last sampling time. Write Resp Time Shown by the all parameter. The average response time, in microseconds, for write operations since the last sampling time.
Examples	Show statistics for all tiers. # show tier-statistics tier all Show statistics for the Standard tier in pool A. # show tier-statistics pool A tier standard
Base types	tier-statistics status
See also	reset all-statistics show pools show tiers