Compaq Infortrend Tunable Parameters, Fault Management, 2 Controller Parameter Settings, ➀ ➁ ➂

2.4Tunable Parameters

Fine-tune the controller and the array parameters for your host applications. Although the factory defaults guarantee the optimized controller operation, you may refer to the table below to facilitate tuning of your array. Some of the performance and fault-tolerance settings may also be changed later during the preparation process of your disk array.

Take this table as a check list and make sure you have each item set to an appropriate value.

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Table 2 - 2 Controller Parameter Settings

Parameters that should be configured at the initial stage of system configuration

Parameters that can be changed later Non-critical

User-Defined		Default				Alternate Settings
Parameters
Fault Management:
➀	Automatic Logical	Enabled when				RAID 1 + Local Spare
	Drive Rebuild - Spare	Spare Drive is				RAID 3 + Local Spare
	Drive	available				RAID 5 + Local Spare
						Global Spare
➀	S.M.A.R.T.	Disabled				Detect Only
						Perpetual Clone
						Clone + Replace
➂	Clone Failing Drive	Manual function				Replace After Clone
						Perpetual Clone
➀	Rebuild Priority	Low (higher				Low
		priority requires				Normal
		more system				Improved
		resource)				High
➀	Verification on Write	Disabled				On LD Initialization
						On LD Rebuild
						On Normal Drive Writes
➂	SDRAM ECC	Disabled				Enabled
➀	Event Notification	Reports to user				Over Dial-out Modem
		interface and				Over SNMP Trap
		onboard alarm				Over Java-Based Management
						Software
➀	System Events	System default				Upper and Lower event triggering
						thresholds configurable
Controller:
➀ Channel Mode		*			Host, Drive, RCCOM, Drive +
					RCCOM
➀	Host and Drive channel IDs			*	*
➀	Controller Unique	Preset	on		hex number from 0 to FFFFF (FW 3.25
	Identifier	some			and above)
		models
➁	Data rate	Auto			Depends on problems solving

2-10 RAID Planning