HP LH4r HP NetServer FCArray Assistant - Installation and User Guide - Page 59

Enable Restrict Reassign to One Block

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Chapter 4 Configuration • Enable SAF-TE Use of UPS - Enables monitoring of uninterruptable power supply (if supported by the system enclosure). This is not currently supported by the HP Rack Storage/12FC. • Enable Restrict Reassign to One Block - Restricts a reassign to the failing block. If disabled, reassigns will be for the entire current I/O blocks, not just all of the failing blocks. • Enable Smart Large Host Transfers - For transfers larger than the stripe size, allows selection of Coalesce (fewer disconnects) on host data transfers. • Enable Elevator Ordering of Device Queues - Attempts to keep the drive heads moving in the same direction as long as possible to improve performance. Assumes LBAs are physically sequentially ordered. • Enable Coalesce Device Queues - Joins data from adjacent I/Os into a single I/O to improve performance. • Enable Super Read Ahead (SRA) - Extends the Read Ahead process by always reading an extra cache line on a read request and reading an additional cache line when a cache hit occurs. Most useful for applications where read-sequential data is high. • Enable True Verification of Data - Performs a true verify with data comparison. • Enable Write Through Verify - During error handling, this turns on Force Unit Access for reads and writes. • Enable Operational Fault Management - Allows the controller to take autonomous actions when a failure occurs. Do not disable this function unless specifically instructed to do so as part of a troubleshooting diagnostic activity. Disable (by checking) or Enable (by un-checking) the following option: • Disable Wide Transfer on Host - When disabled, the controller will negotiate only narrow data transfers. Doing this unnecessarily will result in slower performance. 53

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Chapter 4
Configuration
53
•
Enable SAF-TE Use of UPS
- Enables monitoring of uninterruptable
power supply (if supported by the system enclosure). This is not currently
supported by the HP Rack Storage/12FC.
•
Enable Restrict Reassign to One Block
- Restricts a reassign to the
failing block. If disabled, reassigns will be for the entire current I/O blocks,
not just all of the failing blocks.
•
Enable Smart Large Host Transfers
- For transfers larger than the stripe
size, allows selection of Coalesce (fewer disconnects) on host data
transfers.
•
Enable Elevator Ordering of Device Queues
- Attempts to keep the drive
heads moving in the same direction as long as possible to improve
performance. Assumes LBAs are physically sequentially ordered.
•
Enable Coalesce Device Queues
- Joins data from adjacent I/Os into a
single I/O to improve performance.
•
Enable Super Read Ahead (SRA)
- Extends the Read Ahead process by
always reading an extra cache line on a read request and reading an
additional cache line when a cache hit occurs. Most useful for applications
where read-sequential data is high.
•
Enable True Verification of Data
- Performs a true verify with data
comparison.
•
Enable Write Through Verify
- During error handling, this turns on
Force Unit Access for reads and writes.
•
Enable Operational Fault Management
- Allows the controller to take
autonomous actions when a failure occurs. Do not disable this function
unless specifically instructed to do so as part of a troubleshooting
diagnostic activity.
Disable (by checking) or Enable (by un-checking) the following option:
•
Disable Wide Transfer on Host
- When disabled, the controller will
negotiate only narrow data transfers. Doing this unnecessarily will result in
slower performance.