IBM DS3200 Uživatelský manuál stáhnout pdf (Strana 45)

System Storage DS3000 Support CD. Incorrect drive migration might cause loss of

configuration and other storage subsystem problems. Contact your IBM

technical-support representative for additional information.

Redundant drive channel pair

Each RAID controller on the DS3200 has a drive expansion channel that contains

an x4 SAS port. The storage expansion enclosures that are connected to this

connector form a drive channel. The maximum number of hard disk drives that can

be installed in one drive channel is 48. In a dual-controller DS3200, one drive

channel from each controller combines to form a redundant drive-channel pair.

Figure 18 shows an example of a redundant drive-channel pair. If any component of

the drive channel fails, the RAID controllers can still access the storage expansion

enclosures in the redundant drive-channel pair.

Note: In storage expansion enclosures that are connected to a dual-controller

storage subsystem, you must install the optional second ESM to support

dual redundant drive paths.

DS3200

Server

To SAS HBA controller 1 To SAS HBA controller 2

SAS cable

EXP3000

To DS3200 RAID

controller A

To DS3200 RAID controller B

SAS cable

EXP3000

SAS cable

EXP3000

RAID controller B

RAID controller A

Figure 18. Example of a redundant drive path

Chapter 3. Cabling the storage subsystem 27

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IBM DS3200 Uživatelský manuál Strana 45