Browse Prior Art Database

Low Cost EIDE Data Preservation and Hot Plug Apparatus

IP.com Disclosure Number: IPCOM000015931D
Original Publication Date: 2002-May-17
Included in the Prior Art Database: 2003-Jun-21
Document File: 3 page(s) / 54K

Publishing Venue

IBM

Abstract

Disclosed is a low cost data backup device (LCBD), for the Extended Integrated Drive Electronics (EIDE) data preservation, this device is also Hot Plug capable. The LCBD consists of a PCI adapter and cables. The LCBD is used to control EIDE signals and power to devices attached to an EIDE interface as follows: The EIDE interface allows for two devices (master and slave) per port supporting up to two ports per EIDE interface. A system can be setup with up to four drives per EIDE interface. The EIDE interface allows for two devices (master and slave) per port supporting up to two ports per EIDE interface. A system can be setup with up to four drives per EIDE interface. The LCBD will require a spare drive for every drive for which the data is to be preserved so the user is not required to have a spare drive for each in the system but only for those which are to be preserved in case of drive failure. The LCDB uses a PCI adapter as a backup controller, which will control power and EIDE signals to the attached disks needing backup protection. At any given time all the backup disks are powered off (no power applied) they are only powered up when backing up and/or during an emergency situation when the primary drive has failed. When backing up a master disk, the primary slave disk is placed off line by the LCDB and the backup master disk is brought on line as a slave disk, the backup is performed and the drives are returned to the initial state. When backing up a slave disk the master disk is placed off line by the LCDB and the backup slave disk is brought on line as master disk, the backup is performed and the drives are returned to the initial state. The LCDB EIDE connections to the spare drives are an extension of the primary drives, placed in the same EIDE interface cable see figure 1. 1 By powering off the backup drives while not in use, the LCDB ensures that the drives’ electromechanical parts are not wearing unnecessarily and also will allow the user to replace a drive without having to reboot the system. The LCDB EIDE interface connection is mate-first to avoid interface glitches. All the participating drives will have to be Advanced Technoology attach (ATA-2) compliant in order for the LCDB to be able to control the relationship between master and slave drives. Controlling the master /slave relationship is done by controlling the cable select signal (CSEL) when driven to zero it determines the master drive and one determines the drive is a slave. If any of the drives in a port do not support the signals as a cable select and/or support the signals as a Spindle Synch, the drives’ master/slave relationship is controlled by a set of jumpers installed on the LCDB. These are connected in the same fashion as the power lines. The LCDB will utilize the RESET line to reset both drives on the specific port when a drive has been Hot Plugged or after a drive has been setup for backup in order to recognize the backup drive and then after backup in order to recognize the primary drive. The LCDB will implement the IORDY line to deny access to any requests while switching drives, after switching the drives the RESET line it asserted. 2

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Low Cost EIDE Data Preservation and Hot Plug Apparatus

  Disclosed is a low cost data backup device (LCBD), for the Extended Integrated Drive Electronics (EIDE) data preservation, this device is also Hot Plug capable. The LCBD consists of a PCI adapter and cables. The LCBD is used to control EIDE signals and power to devices attached to an EIDE interface as follows: The EIDE interface allows for two devices (master and slave) per port supporting up to two ports per EIDE interface. A system can be setup with up to four drives per EIDE interface. The EIDE interface allows for two devices (master and slave) per port supporting up to two ports per EIDE interface. A system can be setup with up to four drives per EIDE interface. The LCBD will require a spare drive for every drive for which the data is to be preserved so the user is not required to have a spare drive for each in the system but only for those which are to be preserved in case of drive failure. The LCDB uses a PCI adapter as a backup controller, which will control power and EIDE signals to the attached disks needing backup protection. At any given time all the backup disks are powered off (no power applied) they are only powered up when backing up and/or during an emergency situation when the primary drive has failed. When backing up a master disk, the primary slave disk is placed off line by the LCDB and the backup master disk is brought on line as a slave disk, the backup is performed and the drives are returned to the initial state. When backing up a slave disk the master disk is placed off line by the LCDB and the backup slave disk is brought on line as master disk, the backup is performed and the drives are returned to the initial state. The LCDB EIDE connections to the spare drives are an extension of the primary drives, placed in the same EIDE interface cable see figure 1.

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By powering off the backup drives while not in use, the LCDB ensures that the drives' electromechanical p...