RAIDWatch User's Manual

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<strong>RAIDWatch</strong> User’s <strong>Manual</strong> Capacity Cylinder Head Sector > 1 TB < 65536 255 Variable Variable 255 Table 7-4: Cylinder/Head/Sector Mapping under Sun Solaris • Login Authentication with CHAP: This option allows you to enable or disable the login authentication with the Challenge Handshake Authentication Protocol (CHAP) function. CHAP enables the username and password to be encrypted against eavesdroppers. NOTE: This function is only applicable on EonStor iSCSI series RAID subsystems. Figure 7-12: The Other Page for iSCSI Models Disk-Array Parameters • Rebuild Priority: The rebuild priority determines how much of the system resources are applied when rebuilding a logical drive. Available options are Low, Normal, Improved, and High. The higher priority takes up more system resources and the rebuild process completes more rapidly. However, I/O performance in the meantime is inevitably lower due to the resources consumed. 7-18 Other
Chapter 7: Configuration Parameters • Write-Verify Options: Errors may occur when a hard drive writes data. In order to avoid write errors, the controller can force the hard drives to verify the written data. There are three selectable methods: 1. Verification on LD Normal Access: Performs Verify-after-Write during normal I/O requests. 2. Verification on LD Rebuild Writes: Performs Verify-after-Write during the rebuilding process. 3. Verification on LD Initialization Writes: Performs Verify-after-Write while initializing the logical drive. • Maximum Drive Response Timeout (ms): The main purpose for having a maximum response time on hard drives is to ensure delays caused by media errors or drive erratic behaviors do not result in host I/O timeouts. Doing so can avoid the unnecessary efforts dealing with delays especially when drives showing problems are often the failing drives. Below are some operation limitations: • Battery shall be present and not failed. • Write-Back policy is enabled. • Only available for RAID level 1, 3, 5 and 6. If this option is applied, when write cmd timeout regarding to different RAID levels with its corresponding disk status will: • RAID1: Paired disk conditions are good and the corresponding write cmd is complete. • RAID3, 5 or 6: All member disk conditions are good and others write are completed on the same stripe disk. NOTE: This function is only applicable on RAID subsystems running Firmware 3.42 or above version. • AV Optimization Mode: The AV optimization is applied for the emerging Audio/Video or non-drop frame applications. Choose Fewer Steaming will: 1. Maximum Drive Response Timeout will be automatically set as 160ms. 2. The drive cache-flushing threshold is set as 16% to enhance performance by using LMDD test in the sequential read. 3. Low Priority Rebuild will be much slow down when host I/O loading. Other 7-19
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RAIDWatch® Effortless RAID Managem
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RAIDWatch User’s Manual Copyright
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RAIDWatch User’s Manual CHAPTER 4
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RAIDWatch User’s Manual 9.2.2.4.
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RAIDWatch User’s Manual User’s
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RAIDWatch User’s Manual IMPORTANT
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Chapter 1: Introduction Chapter 1 I
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Chapter 1: Introduction ♦ ♦ ♦
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Chapter 1: Introduction RAIDWatch
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Chapter 2: RAIDWatch Considerations
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Chapter 3: Installation Chapter 3 I
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Appendices Appendices The following
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Appendices RAIDWatch Window Menu Co
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Appendices Appendix B. Glossary Fib
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Appendices NRAID Non-RAID. The capa
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Appendices Appendix C. RAID Levels
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Appendices Figure C-5: RAID 3 Stora
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Appendices Appendix D. Additional R
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