Feature

Description

RAID Levels

0, 1, 1+0, 3, 5, 10, 30, and 50. Enhanced RAID levels supported (with logical volume implementation).

Maximum Number of Logical Drives

8

Raid Level Dependency to Each Logical Drive

Independent. Logical drive configured in different RAID levels can coexist in an array.

Maximum Drive Number of Each Logical Drive

31 (RAID 3 or 5); 45 (RAID 0); 44 (RAID 1).

Logical Drive Identification

Unique, controller-generated logical drive ID; logical drive name is user-configurable.

Maximum Partitions per Array

128 for SCSI arrays, 1028 for FC arrays.

Feature

Description

Maximum Number of Logical Drives in a Logical Volume

8

Maximum Number of Luns per Host ID

Up to 32, user-configurable.

Concurrent I/O

Supported.

Tag Command Queuing

Supported.

Dedicated Spare Drive

Supported; defined as the spare drive specifically assigned to a logical drive.

Global Spare Drive

Supported; the spare drive is available for all logical drives.

Auto-Rebuild Onto Spare Drive

Supported.

Auto-Scan of Replacement Drive Upon Manually Initiated Rebuild

One-Step Rebuild Onto Replacement Drive

Supported.

Auto-Rebuild Onto Failed Drive Replacement

Supported. With no spare drive assigned, the controller auto-scans the failed drive and starts to rebuild automatically once the failed drive has been replaced.

Auto Recovery From Logical Drive Failure

Supported. When a user accidentally removes the wrong drive to cause the second drive failure of a one-drive-failed RAID 5 or RAID 3 logical drive, switches off the controller, puts the drive back and powers on the controller. The logical drive is restored to one-drive-failed status.

Feature

Description

Drive Low-Level Format

Supported.

Drive Identification

Supported. Forces the drive to light the activity indicator so the user can recognize the correct drive.

Drive Information Listing

Supported.

Drive Read/Write Testing

Supported.

Configuration on Disk

Supported. The logical drive information is recorded on drive media.

Feature

Description

Save and Restore NVRAM to and From Disks

Supported. Saves all the settings stored in the controller NVRAM to the logical drive members.

User-Configurable Geometry Range

Sector: 32, 64, 127, 255 or Variable.

Head: 64, 127, 255 or Variable.

Cylinder: <1024, <32784, <65536 or Variable.

Drive Motor Spin-Up

Supported. The controller sends spin-up (start unit) command to each drive at four second intervals.

Drive-Side Tag Command Queue

Supported. User-adjustable up to 128 for each drive.

Host-Side Maximum Queued I/O Count

User-adjustable up to 1024.

Maximum Concurrent Host- LUN Connection

User-adjustable up to 64.

Number of Tags Reserved for Each Host-LUN connection

User-adjustable up to 256.

Drive I/O Timeout

User-adjustable.

Feature

Description

Write-Back and Write-Through Cache

Supported.

Supported Memory Type

SDRAM memory for enhanced performance.

Fast Page Memory with Parity for enhanced data security.

Scatter / Gather

Supported.

I/O Sorting

Supported. Optimized I/O sorting for enhanced performance.

Variable Stripe Size

RAID 5:

Optimization for random I/O (32 Kbyte), optimization for sequential I/O (128 Kbyte), user selectable.

RAID 3:

Optimization for random I/O (4 Kbyte), optimization for sequential I/O (16 Kbyte), user selectable.

Feature

Description

On-Line RAID Expansion

Supported.

RAID Expansion - Add Drive

Supported. Multiple drives can be added concurrently.

RAID Expansion - Copy and Replace Drives

Supported. Replace members with drives of larger capacity.

Feature

Description

Active-Active Redundant Controller

Supported.

Synchronized Cache for Both Controllers

Supported.

Write-back Cache Enabled in Redundant Controller Mode

Yes; with synchronized cache connection between controllers.

Hot-Swappable Controller

Supported.

No Single-Point-of-Failure

Supported.

Dynamic Cache Memory Allocation

Yes. Cache memory is dynamically allocated, not fixed.

Cache Battery Backup

Supported.

Load-Sharing

Supported. Workload can be flexibly divided between different controllers by assigning logical drives to different controllers.

User-Configurable Channel Mode

Supported. Channel modes are configurable as HOST or DRIVE in both single-controller and redundant controller mode.

Redundant Controller Rolling Firmware Upgrade

Firmware upgrade can be downloaded to the primary controller and then be adopted by both controllers.

Redundant Controller Firmware Synchronization

In the event of controller failure, a replacement controller running a different version of firmware can restore a redundant array with a failed controller. Different firmware versions can be autosynchronized later.

Feature

Description

Regenerate Parity of Logical Drives

Supported. Can be performed periodically by the user to ensure that bad sectors do not cause data loss in the event of drive failure.

Bad Block Auto-Reassignment

Supported. Automatic reassignment of bad blocks.

Battery Backup for Cache Memory

Supported. The battery backup solutions provide long-lasting battery support to the cache memory when power failure occurs. The unwritten data in the cache memory can be committed to drive media when power is restored.

Verification on Normal Writes

Supported. Performs read-after-write during normal write processes to ensure data is properly written to drives.

Verification on Rebuild Writes

Supported. Performs read-after-write during rebuild write to ensure data is properly written to drives.

Verification on LD Initialization Writes

Supported. Performs read-after-write during logical drive initialization to ensure data is properly written to drives.

Drive SMART Support

Supported. Default: Disabled.

Clone Failing Drive

Users can choose to clone data from a failing drive to a backup drive manually.

Feature

Description

Password Protection

Supported.

User-Configurable Password Validation Timeout

Supported. After a specific period of time without any user interaction, the password is requested again. This prevents unauthorized operation when the user is away.

Feature

Description

SAF-TE and SES Support

Supported.

SAF-TE and SES Polling Period

User-configurable (50 ms, 100 ms, 200 ms, 500 ms, 1~60 sec).

SAF-TE and SES Temperature Value Display

Supported. Displays the temperature value provided by enclosure SAF-TE module (if available).

Feature

Description

On-Board Controller Voltage Monitors

Supported. Monitors the 3.3V, 5V, and 12V voltage status. Event trigger threshold user-configurable.

On-Board Controller Temperature Sensors

Supported. Monitors the CPU and board temperature status. Event trigger threshold user-configurable.

Enclosure Monitoring of Redundant Power Supply Status, Fan Status, UPS Status and Temperature Status

Supported. Fault-Bus, SAF-TE, SES, ISEMS.

Feature

Description

RS-232C Terminal

Supports terminal modes: ANSI, VT-100, ANSI Color.

Provides menu-driven, user-friendly, text-based interface.

Beeper Alarm

Warns user when any failure or critical event occurs.