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Glossary-8
Glossary
redundancy
The capability of preventing data loss if a disk drive fails. Some
array types give you this capability using one of two methods: two
identical copies or parity.
S
SAF-TE (SCSI Accessed Fault-Tolerant Enclosure)
The SAF-TE specification is an open specification designed to
provide a comprehensive standardized method to monitor and
report status information on the condition of disk drives, power
supplies, cooling systems, and other components used in high-
availability LAN servers and storage subsystems
. See also
enclosure.
SAN
Stands for Storage Area Network. SAN is a dedicated network for
storage data traffic that links one or more servers to one or more
storage systems. Each storage system could be RAID, tape backup,
tape library, CD-ROM library, or JBOD.
SES (SCSI Enclosure Services)
SES enclosures support management similar to SAF-TE enclosures.
SES is a SCSI-3 specification. See also enclosure; SAF-TE (SCSI
Accessed Fault-Tolerant Enclosure).
SCSI
Stands for Small Computer System Interface. SCSI is an industry
standard for connecting peripheral devices and their controllers to
an initiator. Storage devices are daisy-chained together and
connected to a host adapter. The host adapter provides a shared
bus that attached peripherals use to pass data to and from the host
system. Examples of devices attached to the adapter include disk
drives, CD-ROM drives, optical disks drives, and tape drives. In
theory, any SCSI device can be plugged into any SCSI controller.
SCSI bus
A SCSI bus provides a means of transferring data between SCSI
devices. A SCSI bus is either an 8- or 16-bit bus that supports up to
8 or 16 devices, including itself. The bus can consist of any mix of
initiators and targets, with the requirement that at least one
initiator and one target must be present.
- Adaptec Disk Array 1
- Administrator 1
- Copyright 2
- Trademarks 2
- Disclaimer 2
- Contents 3
- 3 Monitoring System Status 4
- 4 Managing Spares 4
- 5 Configuring the Controller 4
- 7 Troubleshooting 5
- A Storage Concepts 6
- B SAF-TE Implementation 6
- Getting Started 7
- Getting Online Help 8
- ↑ or ↓ key 10
- Changing the Screen Display 11
- Creating and Managing 12
- Arrays and Partitions 12
- Managing Arrays 20
- Viewing Array Status 22
- Viewing Disk Drive Status 23
- Verifying an Array 24
- Viewing Verification Status 25
- Reconstructing an Array 26
- Expanding Array Capacity 27
- Viewing Expansion Status 28
- Changing an Array Name 29
- Changing Array Ownership 29
- Trusting an Array 30
- Deleting an Array 32
- Managing Partitions 33
- Viewing Partition Status 35
- Viewing Partition Statistics 36
- ■ I/O size 37
- Expanding a Partition 38
- Changing a Partition Name 38
- Changing a Partition LUN 39
- Deleting a Partition 40
- Monitoring System Status 41
- Viewing the Most Recent Event 43
- Viewing One Event at a Time 43
- Information 44
- Displaying Overall Statistics 47
- Resetting Overall Statistics 49
- Managing Spares 50
- Managing Dedicated Spares 51
- Enabling Dynamic Spares 52
- Managing the Spare Pool 54
- Displaying the Spare Pool 55
- Configuring the Controller 56
- Rebooting the Controller 57
- Changing the Date and Time 57
- Configuring the Host Channels 58
- Configuring the SCSI Channels 61
- Understanding Operating Modes 63
- Changing the Operating Mode 65
- Managing the Other Controller 66
- Killing the Other Controller 68
- Disabling SCSI Channel 3 69
- Changing the Sample Rate 70
- Locking the Cache 72
- Configuring the Battery 73
- 2 Select Yes and press Enter 74
- 3 Press Enter to reboot 74
- Changing the Utility Priority 75
- Rescanning All Channels 76
- Pausing I/O 77
- Restoring Default Settings 78
- Managing Disk Drives and 79
- Enclosures 79
- Displaying All Disk Drives 80
- Displaying Disk Cache Status 82
- Blinking a Disk Drive LED 83
- Taking Down a Disk Drive 84
- Testing a Disk Drive 85
- Managing SAF-TE Enclosures 86
- ■ Type NONE and press Enter 87
- Input Problems 90
- Array Problems 91
- Host SCSI Channel Problems 92
- Device SCSI Channel Problems 93
- Problems During Bootup 94
- Warning and Error Events 96
- Disk Channel 99
- Sense Key 99
- Sense Code 99
- Sense Code Qualifier 99
- Disk Channel SCSI ID 101
- Error Code 101
- Troubleshooting 103
- Storage Concepts 104
- Channels 105
- Disk Drives 105
- Controllers 105
- Storage Systems 105
- Free Space 107
- Partitions 107
- Array on Virtual 108
- Redundancy 109
- Array Types 109
- Volume Set 111
- Stripe Set (RAID 0) 111
- Mirror Set (RAID 1) 113
- , with one chunk of each 114
- Figure A-6 RAID 5 set 115
- SAF-TE Implementation 119
- Enclosure Considerations 120
- Host Communication Methods 121
- Glossary 122
- Glossary-2 123
- Glossary-3 124
- Glossary-4 125
- Glossary-5 126
- Glossary-6 127
- Glossary-7 128
- . See also 129
- Glossary-9 130
- Glossary-10 131
- Glossary-11 132
- Adaptec, Inc 139
- 691 South Milpitas Boulevard 139
- Milpitas, CA 95035 USA 139
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