IBM MegaRAID 8480 manual Number of Physical Disks Supported

Figure 1.2 shows an example of a RAID controller configured with an LSISASx12 expander that is connected to SAS devices.

Figure 1.2 Example of RAID Controller Configured with LSISASx12 Expander

PCI Express Interface

SAS RAID Controller

32-bit Memory

Address/Data

Bus

I2C

Interface

Flash ROM/

PSBRAM/ NVSRAM

I2C

LSISASx12

SAS	SAS
Drives	Drives

LSISASx12

	SAS	SAS
Drives		Drives

1.4.1Number of Physical Disks Supported

Your configuration planning for the 8480 RAID controller depends in part on the number of physical disks that you want to use in a RAID array. The number of drives in an array determines the RAID levels that can be supported. Only one RAID level can be assigned to each virtual disk. Table 1.1 shows the minimum and maximum number of drives required for each RAID level.

Table 1.1	Physical Drives Required for Each RAID Level
RAID	Minimum # of	Maximum # of
Level	Physical Drives	Physical Drives
0	1	32

1-6Overview

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