Array Configuration Utility. An application used to create, configure, and manage arrays from the controller’s BIOS.
A logical disk created from available space and made up of one or more segments on one or more physical disks. Arrays are typically used to provide data redundancy and/or enhanced I/O performance. Also known as container.
See initialize.
AT Bus Attachment. Standard parallel interface to IDE hard disks typically used in desktop computers and some entry-level servers. Serial ATA is a successor to ATA.
Disk configured to automatically recover data from a failed segment/disk in a redundant array. In the event of a drive failure in a SAF-TE enclosure with no assigned hot spares if automatic failover is enabled then when the failed drive is replaced with a new drive, a rebuild starts automatically.
Unused space on an initialized disk from which logical devices (arrays) are created. When an array is deleted, the space that it used is returned to the available space pool. Also called available segment.
Option that forces the controller to constantly check all portions of disks used by all arrays to see if the disks can return data from the blocks. On a fully-redundant RAID 5 with no dead segments, the controller repairs any data that it cannot read.
Segment that is in an unknown state.
Command that blinks the drive LEDs of a single selected hard disk.
Array configured as the boot device.
Background initialization of a redundant array. The array is accessible throughout. RAID 5 generates parity based on the current contents of the member segments while RAID 1 copies the contents of one (master) drive to a second (slave) drive.
See channel.
Fast-access memory on the controller that serves as intermediate storage for data that is read from or written to devices.
Total usable space available in megabytes or gigabytes.
Any path used for the transfer of data and the control of information between storage devices and a storage controller. Each controller's channels are identified by a number from 0 to the maximum number of channels minus one. Also known as a bus.
Foreground initialization of a fault-tolerant array. A clear operation zeros all blocks of the array. The array is not accessible until the clear task is complete.
Joining in sequential order.
Command that reads all the blocks of a RAID 1 or RAID 5 to determine if the blocks are consistent. If any inconsistent blocks are detected, they are fixed.
Component that can take the place of a failed component only on the fault-tolerant array to which it is explicitly assigned.
A redundant array in which one or more members have failed but data is intact and redundancy has been compromised in the degraded state. The array and all data is accessible but a further drive failure would cause the array to fail and result in data loss.
Fault-tolerant array where one or more member segments have failed such that data is intact but redundancy has been compromised and utilized.
Data that has been written to a cache but which has not been “flushed” out to its final destination.
Physical disk drive. Randomly accessible, re-writable data storage device. Also called hard disk.
Unique disk identifier that consists of the channel number, SCSI ID (target ID), and LUN. For example, (channel:ID:LUN) 1:04:0. See also channel; LUN; SCSI device ID.
Disk indicator LED that illuminates during Read or Write operations.
Logical disk created from two or more single-level arrays. See also RAID 10, RAID 50.
Physical housing for disks, which usually contains one or more power supplies, fans, and temperature sensors. Enclosures are normally external to the computer to which they are connected although some computers do contain internal enclosures.
Notification or alert from the system, indicating that a change has occurred.
File used to maintain information about prior controller activities or errors.
Means used by the system to communicate information about events that have occurred.
Add space to an array by adding available space.
State of a non-redundant array that has suffered a single drive failure, or a redundant array that has suffered multiple drive failures becomes failed and inaccessible. This results in data loss.
A segment that is no longer usable by an array because it is either logically bad, and therefore no longer needed, or physically damaged.
In a redundant array that has suffered a failure, to automatically reconstruct the missing data onto an assigned hot spare.
Arrays that have redundant components (RAID 1, RAID 5, RAID 10, RAID 50).
Device with (virtual) logical device order number 0 (zero). The boot device of the system. Also called first virtual device.
Disk that has previously been initialized on another Adaptec Storage Manager-Browser Edition controller. The RAID signature on the disk enables the RAID controller to identify whether the disk was initialized on the controller it is currently connected to or not.
Disk that can replace a failed component in any array on the same controller, provided that the available capacity is at least equal to that of the failed component. See also hot spare.
See disk.
Disk configured to be available to automatically receive reconstructed data in the event of a drive failure in a redundant array. See also rebuild, global hot spare.
To remove a component from a system and install a new component while the power is on and the system is running.
An impacted array is one that has been created but the initial build operation did not complete. All member drives are present and operational, all data written to the array is protected. Running a Verify with Fix Task makes the array optimal.
The process of ensuring that the data on a redundant array is fully protected. This is done when the array is created. See also: build and clear.
Array that is ready for data reads and writes.
Disk that contains an MS-DOS partition table. The controller manages the disk as a legacy disk array where there is a one-to-one logical to physical mapping of array to disk.
Device (disk) comprised of spaces from one or more physical drives and presented to the operating system as if it were one drive.
Sequence in which the server’s operating system detects the arrays, single hard disks, and other devices connected to the controller when the server boots.
Process performed by the drive firmware that completely cleans any data off the hard disk.
Logical Unit Number. The number assigned to a subdevice of a SCSI device. Each SCSI device can contain up to eight subdevices numbered 0 through 7. However, most SCSI devices contain only one subdevice (LUN 0).
See reconfiguration.
See RAID 1.
Process of receiving, displaying, and logging system events.
Online Capacity Expansion. The incremental expansion of an array that requires no downtime and retains all the attributes of the original array. See also reconfiguration, RAID 5.
Array that can no longer be accessed.
Distance from the beginning of a disk to the start of a segment.
Array in its normal operational state in which all of the components are present and operating correctly.
Form of error-checking redundancy used to protect the data in a RAID-5.
Object that represents a component that cannot be configured by the controller management software; for example, a missing drive.
Single drive. See also logical device.
A Quick Init array is available instantly with no on-going controller activity and all data written is protected. The array remains in this state, and for RAID 5 and 50 arrays write performance is impacted, until a Verify with Fix Task is run on it.
Redundant Array of Independent Disks. Redundancy, however, is not a feature of RAID 0.
Single-level array consisting of two or more equal-sized segments residing on different disks. RAID 0 distributes, or stripes, data evenly across its respective drives in equal-sized sections. See also single-level array.
See RAID 10.
Single-level array consisting of two equal segments residing on two different disks. Provides redundancy by storing the same data on two components.
Dual-level array created by using two or more equal-sized RAID 1s to create a RAID 0. See also stripe.
Single-level array consisting of at least three equal-sized segments with the capacity of one segment used for parity data. In a RAID 5, parity is distributed in stripes across all segments.
Dual-level array created by using two or more equal-sized RAID 5s. See also RAID 0, stripe, stripe size.
The RAID signature on the disk enables the RAID controller to identify whether the disk was initialized on the controller it is currently connected to or not.
Concatenation of multiple RAID 0, RAID 1, or RAID 5 arrays.
Background regeneration of redundant data (and/or parity) on a RAID 1 or RAID 5.
Process of expanding an array or migrating an array from one RAID type to another; changing the stripe size of a stripe set, RAID 5, or RAID 10 or moving a logical device’s segments to to other disks.
Maintaining data in a system so the system can automatically replace a failed component with a working substitute. RAID 5/50 components are redundant because surviving members can collectively replace the data from a failed component.
Process of updating the current screen to show all currently available resources.
Self-Monitoring Analysis and Reporting Technology. This is a drive feature designed to determine the reliability status of a disk. If S.M.A.R.T. senses that a potential problem is imminent, the user may be notified and advised of the appropriate action.
SCSI Accessed Fault-Tolerant Enclosure. See enclosure.
Small Computer System Interface. High-speed parallel communication scheme permitting data transfer rates of up to 320 MB/sec using the Ultra320 specification. The current specification supports up to 15 devices per channel. See also ATA.
Or SCSI ID. Number assigned to each SCSI device attached to a SCSI channel. Also known as target ID.
Logical device (lower array in a dual-level array) that is never visible to the operating system and can be used only by other logical devices. For example, a RAID 1 that is a member of a RAID 10 is a second-level array. Contrast with top-level array.
Reserved area on a physical disk that is a by-product of array creation or failover operation. That is, when the software creates an array, it automatically converts the user-specified available space into segments. A segment is always part of a logical device and cannot be used by more than one logical device at a time.
A successor to ATA that transfers data serially, instead of in parallel.
Single segment of a drive’s available space.
Array created from one or more segments. See also volume, RAID 0, RAID 1, RAID 5.
Concatenation of segments on two or more drives.
See hot spare.
Contiguous set of data distributed across all the disks in an array. A RAID 0 distributes, or stripes, data evenly across its respective disks in equal sized sections called stripes.
In striped array types, (RAID 0, RAID 5, RAID 10, RAID 50) data is distributed, or striped, across the member disks in equally-sized sections. The amount of data in each section on a disk is the stripe size.
An operation that occurs only on the RAID controller, asynchronous to all other operations; for example, initializing a disk or verifying an array. Some tasks can take an extended period of time, particularly if the RAID controller is also performing intensive data I/O while the task is running.
Upper array in a dual-level array. For example, the RAID 0 in a RAID 10 is a top-level array.
Low-level test of a drive or logical device. RAID 5 checks consistent data and parity, optionally corrects parity errors. RAID 1 checks both drives are consistent, optionally corrects errors on slave drive. For a drive, checks whole drive can be read.
See logical device order.
See simple volume, spanned volume, RAID volume.
User-specified temperature limit above which Adaptec Storage Manager-Browser Edition displays a warning in the Enclosure view windows, the Enclosure Properties dialog box, and the Enclosure Fans, Temperature Sensors and Power Supplies dialog box.