HP 3PAR StoreServ 7400 4-node HP 3PAR Command Line Interface Reference (OS 3.1 - Page 180
Hist Commands, histch
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15 Hist Commands histch DESCRIPTION The histch command displays a histogram of service times in a timed loop for individual chunklets. SYNTAX histch [options ] AUTHORITY Any role in the system. OPTIONS -ld Specifies the Logical Disk (LD), identified by name, from which chunklet statistics are sampled. -ch Specifies that statistics are limited to only the specified chunklet, identified by number. -metric both|time|size Selects which metric to display. Metrics can be one of the following: • both - (Default) Displays both I/O time and I/O size histograms. • time - Displays only the I/O time histogram. • size - Displays only the I/O size histogram. -timecols For the I/O time histogram, show the columns from the first column through last column . The available columns range from 0 through 31. • The first column () must be a value greater than or equal to 0, but less than the value of the last column () (default value of 6). • The last column () must be less than or equal to 31 (default value of 15). • The first column includes all data accumulated for columns less than the first column and the last column includes accumulated data for all columns greater than the last column. -sizecols For the I/O size histogram, show the columns from the first column () through the last column (). Available columns range from 0 through 15. • The first column () must be a value greater than or equal to 0, but less than the value of the last column () (default value of 3). • The last column () must be less than or equal to 15 (default value of 11). -pct Shows the access count in each bucket as a percentage. NOTE: For the following options, by default the histogram shows data from the start of the command. -prev|-begin 180 Hist Commands