1. Manuals
  2. Brands
  3. Dot Hill Systems Manuals
  4. Storage
  5. SANnet II 200
  6. Technical description

Dot Hill Systems SANnet II 200 Technical Description

Scsi array
Hide thumbs Also See for SANnet II 200:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Installation, Operation and Service Manual
SANnet II 200 SCSI Array
Technical Product Description Guide
January 2003
83-00002947 Revision A
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the SANnet II 200 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Dot Hill Systems SANnet II 200

Summary of Contents for Dot Hill Systems SANnet II 200

  • Page 1 SANnet II 200 SCSI Array Technical Product Description Guide January 2003 83-00002947 Revision A...
  • Page 2 Copyright Copyright 2001-2003 – Dot Hill Systems Corp. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed, or transmitted, in any form or by any means – manual, electric, electronic, electromechanical, chemical, optical, or otherwise –...

  • Page 3: Table Of Contents

    Contents TABLE OF CONTENTS ... 3 INTRODUCTION ... 4 ... 4 EATURES RCHITECTURE UNDAMENTALS ... 5 ANAGEMENT NTERFACES ELIABILITY VAILABILITY AND ... 7 ERFORMANCE ... 7 CALABILITY ARCHITECTURE ... 8 ... 8 NCLOSURE ODULES ... 8 ONTROLLER ODULES ... 9 ODULES OWER AND OOLING...

  • Page 4: Introduction

    Each SANnet II 200 SCSI array holds twelve 1-inch high disks in a 2U package and is available with dual redundant RAID controllers, a single RAID controller, or without controllers for use as an expansion unit.

  • Page 5: Architecture Fundamentals

    – rather than multiple independent enclosures. The expansion of base units is optional. The smallest possible SANnet II 200 SCSI array configuration consists of a single base enclosure containing a number of fully integrated field replaceable units (FRUs) such as controllers. Other FRUs include enclosure management units (EMUs), host input/output cards (SCSI modules), termination cards and power/cooling units.

  • Page 6: Reliability, Availability And Serviceability

    FIGURE 3: Typical Sequence of Installation Steps Reliability, Availability and Serviceability Comprehensive reliability, availability and serviceability (RAS) are assured within SANnet II 200 SCSI arrays. Proven low voltage differential (LVD) signaling across all disk and host SCSI buses keeps data transfers reliable. Flexible support for RAID levels 0, 1, 0+1, 3, 5, 3+0 and 5+0, plus global and dedicated spare disks provide powerful choices for protecting valuable information.

  • Page 7: Performance

    Performance SANnet II 200 SCSI arrays provide very high levels of performance within a compact package. The use of Ultra160 SCSI technology throughout for disks and servers results in performance approaching that of storage area networks (SAN) from a direct attached storage (DAS) solution.

  • Page 8: Architecture

    The foundation of every array is the enclosure module. Enclosure Modules The primary building block of any SANnet II 200 SCSI array is its enclosure. It consists of a compact metal chassis with internal controller mid-plane and disk mid-plane. The controller mid- plane interconnects the rear-facing FRUs and connects to the SCSI buses of the disk mid-plane.

  • Page 9: Disk Modules

    FIGURE 5: SANnet II 200 SCSI Array RAID Controller Diagram Disk Modules The SANnet II 200 SCSI array supports a variety of disks available in a number of capacities and speeds. Current choices include 36GB, 73GB and 146GB disk drives operating in Ultra160 SCSI...

  • Page 10: Power And Cooling Modules

    To unlock a disk, turn the screw to the left. Avoid operating a SANnet II 200 SCSI array for more than a few minutes with a disk removed to maintain optimum cooling. If a disk is being removed for an extended period of time, install an air management module in its place.

  • Page 11: Enclosure Management Unit Modules

    To lock an FRU in place, use a Phillips screwdriver to turn the screw within the thumbscrew collar to the right. To unlock one, turn the screw to the left. Avoid operating a SANnet II 200 SCSI array for more than a few minutes with a power/cooling module removed to maintain optimum cooling.

  • Page 12: Scsi Module

    Consult the SANnet II 200 SCSI array user’s guide for more detailed information.

  • Page 13: Termination Module

    Termination Module The SANnet II 200 SCSI array terminator board is a field-serviceable FRU that supplies the SCSI termination throughout a base enclosure. It is hot-serviceable but not hot-swappable, so replacing one will require planned downtime. The termination module is essentially hidden between controllers, so it requires the removal of controllers before it can be replaced.

  • Page 14: Features

    Controller Redundancy SANnet II 200 SCSI arrays are available with single or redundant controllers. When two controllers are present, they always operate as a redundant pair. They cannot function as two individual, i.e., single controllers.

  • Page 15: Cache Protection

    SANnet II 200 SCSI arrays protect its cache in a number of proven ways: ·...

  • Page 16: Write Caching

    (fastest) caching. Neither write-cache option is superior in every environment, so it is important to understand what each option does before choosing. With write-through caching selected, all information received by a SANnet II 200 SCSI array is written to its disks before the array confirms the successful completion of the write operation.

  • Page 17: Spare Disks

    Spare Disks A SANnet II 200 SCSI array disk can be assigned as a data disk or a spare disk. When configured as a spare, it can serve as a local spare to one specified logical drive or as a global spare available to all logical drives.

  • Page 18: Management

    From a single SANscape console located anywhere on a network, system administrators can view entire SANnet II 200 storage systems, change storage configurations and monitor storage status. In the event of a status change, Dot Hill’s SANscape software sends real- time, proactive alerts to the system administrator via its console display, e-mail, or through an alphanumeric pager, allowing users to monitor the storage system remotely.

  • Page 19: Monitoring

    Monitoring The main SANscape window provides status at a glance for all networked array devices. It indicates the status of the devices and logical drives connected to servers monitored by the SANscape Console. The devices include host adapters, array controllers, disk storage enclosures, physical disk drives and other SCSI devices.
  • Page 20 When the console receives any event, it logs it into SANscape’s Event Log file, EVENTLOG.TXT, and displays it in the Event Log window. Also, if the event occurs on a server, the notification of the event is sent to that server’s operating environment/system event log.

  • Page 21: In-Band & Out-Of-Band Management

    In-Band & Out-of-Band Management SANscape’s out-of-band storage management capability enables you to monitor and manage Dot Hill arrays over the network using TCP/IP. Unlike in-band storage management (the standard method of storage management for storage), which requires the SANscape Agent to be running on the server that is physically attached to the storage, out-of-band storage management does not require the SANscape Agent to be running on the server that is physically attached to the storage.

  • Page 22: Event Reporting

    Receive messages and decrypt encrypted messages on the Mail Receiver Tool To use SANscape throughout the network, install it as a service on each computer that has a SANscape agent running (an agent is the software that communicates to attached SANnet II 200 SCSI arrays).

  • Page 23: Firmware Updates

    Fast and easy download of new versions of controller and disk firmware is possible using the SANnet II 200 SCSI array management suite. The Dot Hill CLI and SANscape both support controller updates over in-band SCSI connections and out-of-band Ethernet connections.

  • Page 24: Raid

    Detailed Specifications RAID RAID levels Maximum number of logical drives RAID level dependency to each logical drive Maximum number of drives for each logical drive Logical drive identification Maximum partitions of each logical drive Maximum number of logical drives in a logical volume Maximum number of logical volumes Maximum number of LUN per host ID...

  • Page 25: Advanced Features

    Supported memory type Read-ahead operation Multi-threaded operation Scatter/gather supported I/O sorting Variable stripe size Advanced Features Drive low-level format Drive identification Drive information listing Drive read/write testing Configuration on disk Save/restore NVRAM to/from disks Save/restore NVRAM to/from file Host LUN geometry & user configurable default geometry User configurable geometry range SDRAM memory for enhanced performance.

  • Page 26: Raid Expansion

    Drive motor spin-up Drive-side tag command queue Host-side maximum queued I/O count Maximum concurrent host LUN connection Number of tags reserved for each host LUN connection Drive I/O timeout RAID Expansion On-line RAID expansion Mode-1 RAID expansion-add drive Mode-2 RAID expansion – copy and replace drives Expand capacity with no extra drive bays required...

  • Page 27: Data Safety

    No single-point-of-failure Automatic engagement of replacement controller Dynamic cache memory allocation Environment management Cache battery backup Load sharing User-configurable channel mode Redundant controller firmware upgrades Redundant controller firmware synchronization Data Safety Regenerate parity of logical drives Bad block auto-reassignment Battery backup for cache memory Verification on normal writes Verification on rebuild writes Verification on LD initialization writes...

  • Page 28: User Interface

    Drive S.M.A.R.T. support Clone failing drive User Interface RS-232C terminal Supported Supported Users may choose to clone data from a failing drive to a backup drive manually Supported terminal modes: ANSI, VT-100, ANSI Color. Provides menu- driven user-friendly text-based interface.

  • Page 29: Performance Parameters

    Performance Parameters Parameter RAID level Rebuild priority Verification on write Max tag count Max queued I/O count LUNs per SCSI ID Number of host-LUN connections Tag per host-LUN connection Optimization for random/sequential Write-back cache Optional paired controller configuration Cylinder, head, sector mapping Range JBOD, N-RAID, RAID 0, RAID 1, RAID 1+0, RAID 3, RAID 3+0, RAID 5, RAID 5+0...

  • Page 30: Glossary

    Glossary active termination, Terminates the SCSI bus with a series of resistors tied to +5 volts. The terminator is regulated labeled Regulated but is often referred to as an Active Terminator. active-active A pair of components, such as storage controllers in a failure-tolerant RAID array that controllers share a task or set of tasks when both are functioning normally.
  • Page 31 fast write Allows disk write commands to be safely acknowledged to the host before the data is actually written to the disk media. This can be enabled/disabled through the storage management software. fast/wide SCSI Data transfer rate of 20 MB/sec. Wide devices can be connected to a standard SCSI interface but the extra data lines need to be terminated.
  • Page 32 hot spare or hot A drive in a RAID 1 or RAID 5 configuration that is held in reserve to replace any other sparing drive that fails. After a reconstruction, the hot-spare drive is returned to the standby status. hot-serviceable The ability to remove, replace or add a device while power is still applied but all I/O processes are suspended.
  • Page 33 commission to complete a repair process. N port A Fibre Channel port in a point-to-point or Fabric connection. NVRAM Non-Volatile Random Access Memory. A memory unit equipped with a battery so that the data stays intact even after the main power had been switched off. out-of-band Refers to the connections and devices that are not in the data path.
  • Page 34 devices and servers providing accelerated data access. Single connector attachment. A SCSI disk connector technology coinvented by Sun Microsystems. The SCA provides all SCSI, power, and control signals in a single connector, and enables easy servicing and highly reliable, pluggable disk drives. SCSI Small Computer Systems Interface.
  • Page 35 independent disk spindles. The amount of data written on each disk before moving to the next drive is the stripe width. terminator A part used to end a SCSI bus. Terminators prevent energy from reflecting back into a cable plant by absorbing the radio frequency signals. throughput A measure of sequential I/O performance, quoted in MB/sec.

Table of Contents

Save PDF