Subsystem And Controller Features; Operational Features - Promise Technology VessRAID 1740s Product Manual

VessRAID 1740s, 1840s Product Manual
• Support for the latest RAID technology—RAID 6—Protection from a
catastrophic double-drive failure.
• Resilient data protection features such as Predictive Data Migration™ and
PerfectRAID™ provide rock solid data protection.
• LUN Mapping and Masking bring flexibility for multiple application and OS
support on the same storage subsystem.
• Open architecture, industry's most comprehensive support for SAS and
SATA hard drives and standards-based management interfaces including
SNMP and WBEM.
• Support for the industry standard Disk Data Format (DDF from SNIA)
ensures interoperability and drive roaming even among different RAID
vendors.
• Compatible with leading SAS hard drives, host bus adapters, and RAID
controllers.

Subsystem and Controller Features

• Drive Support: Up to 16 3.5" x 1" SAS or SATA 3 Gb/s hard disk drives.
• Supports any combination of SAS and SATA drives in the system.
• Staggered physical drive spin-up.
• External I/O Ports: Dual 3 Gb/s SAS x4 host ports; One external 3 Gb/s SAS
x4 port for JBOD expansion.
• Data Cache: Shared 512 MB predictive data cache (expandable to 2 GB);
Automatic write cache destaging; 72-hour battery backup (for 512 MB
cache).
• Command Queue Depth: 512 commands per VessRAID (up to 1024
commands with 512 MB memory).

Operational Features

• RAID Levels: RAID 0, 1, 1E, 5, 6, 10, 50, and 60 – Any combination of these
RAID levels can exist at the same time.
• Configurable RAID stripe size: 64 KB, 128 KB, 256 KB, 512 KB, and 1 MB
stripe size per logical drive.
• Background task priority tuning: Adjustment of minimum I/O reserved for
server use during all background tasks.
• Hot spares: Multiple global or dedicated hot-spare drives with revert option.
• Maximum LUNs per subsystem: 256 in any combination of RAID levels.
• Maximum LUNs per array: 32 logical drives (LUNs). Supports LUN carving
by allowing an array to be divided into multiple logical drives. Supports out-
of-order logical drive deletion and re-creation.
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