Dell 34XX, 38XX, 32XX, 36XX manual Reads, PerformanceModeling command

Parameter	Description
	brackets ([ ]). If the SSD cache name contains
	special characters or consists only of numbers, you
	also must enclose the identifier in double
	quotation marks (" ") inside square brackets.
controller	Each RAID controller module stores SSD cache
	metadata for the virtual disks that it owns.
	Therefore, the SSD cache statistics are maintained
	and displayed per RAID controller module. Valid
	RAID controller module identifiers are 0, 1, or both,
	where 0 is the RAID controller module in slot 0, 1
	is the RAID controller module in slot 1, and both is
	both RAID controller modules. Enclose the RAID
	controller module identifier in square brackets ([ ]).
	If you do not specify a RAID controller module, the
	default value is both.
file	The file path and the file name to which you want
	to save the SSD cache statistics. Additional
	statistics are available when you save the statistics
	to a file.
	Enclose the file name in double quotation marks ("
	"). For example: file="C:\Program Files\CLI\logs
	\statistics.csv".

Notes

The following statistics are displayed on the screen:

Reads	Total number of host reads of SSD cache-enabled virtual disks.
	Compare the Reads relative to Writes. The Reads need to be greater than the
	Writes for effective SSD cache operation. The greater the ratio of Reads to Writes
	the better the operation of the cache.
Writes	Total number of host writes to SSD cache-enabled virtual disks.
Cache Hits	A count of the number of cache hits.
Cache Hits (%)	Derived from Cache Hits/total reads.
	The Cache Hit percentage should be greater than 50% for effective SSD cache
	operation. A small number could be indicative of several things:
	• Ratio of Reads to Writes is too small
	• Reads are not repeated
	• Cache capacity is too small
	NOTE: To help determine the ideal SSD cache capacity, you can run the
	Performance Modeling Tool using the start ssdCache [ssdCacheName]
	performanceModeling command.

360