Number Of Physical Disks Supported; Example Of A Serveraid Controller Configured With An Lsisasx12 Expander - IBM ServeRAID M5014 User Manual

1.4.1

Number of Physical Disks Supported

Figure 1.2 Example of a ServeRAID Controller Configured with an
LSISASx12 Expander
LSISASx12
Expander
SAS/SATA II SAS/SATA II
Drives
Your configuration planning for your ServeRAID 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 by this controller. Only one RAID level can be assigned
to each virtual disk.
maximum number of drives required for each RAID level.
Table 1.1 Physical Devices Required for Each RAID Level
RAID Minimum # of
Level Physical Devices
0
1
5
6
10
Configuration Scenarios
PCI Express Interface
8
SAS RAID Controller
LSISAS2108
PCI Express to SAS ROC
SAS/SATA
Drives
Drives
Table 1.1 shows the minimum number and the
Maximum # of
Physical Devices
1
2
3
3
4
Peripheral
Bus
72-bit DDR/DDR2
with ECC
Interface
LSISASx12
Expander
SAS/SATA II
SAS/SATA II
Drives
Drives
32
32
32
32
32
Flash ROM/
NVSRAM/
2
I C/UART
SRAM
SDRAM SRAM SRAM
1-7