Seagate ST3390N Guía de instalación descargar pdf (Pagina 359)

100

101

Hardware maintenance 18-21

Disk unit replacement—shadowed system

Standard 1.0 Modular Option EC Installation and Maintenance Guide November 1999

Disk unit replacement—shadowed system

Introduction

Disk shadowing is available for Modular Option EC systems.

Dissimilar disk drives can be used in the same node provided

the smaller sized disk (that is, the primary disk) has its SCSI

address set to 0.

Disk shadowing

Disk shadowing is a process in which the data from one disk

is recorded to a second disk to provide protection against loss

of data in the event a disk failure occurs. Shadowing involves

multiple write and alternate read operations. When a disk

error occurs on one disk, the system generates a SEER and

ignores that disk drive; it continues to work with the other

disk drive. In this way, service is not interrupted when the

disk goes down. At the scheduled maintenance time, the node

is brought down and the disk drive is replaced. Hot-pluggable

disk drives are not supported.

Disk replacement

Disk replacements on an active system should be performed

only on those nodes listed in the table below.

Note: Nodes not listed in the table contain EVB termination.

To replace the disk while the system is active will cause an

entire system outage if the node is powered down.

Disk replacements allowed on an active system

Slot locations:

shadowed disks

If you have a shadowed system, the SCSI ID is 0 for the

primary disk and 2 for the secondary disk. The disk drive

Number of

nodes in the

shadowed

system

Nodes on which the disk can be powered

down and reseated while the system is

active

2-node system node 2

3-node system node 2 (if there is only one utility card)

4-node system nodes 2 and 4 (2, 3, and 4 if there is only one

utility card)

5-node system nodes 2, 3, and 4

1 2 ... 354 355 356 357 358 359 360 361 362 363 364 ... 467 468

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Seagate ST3390N Guía de instalación Pagina 359

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