Compare RAID and JBOD features as used with single- and
two-system HA configurations.
Table 1. SAS RAID and JBOD HA configurations| Multi-initiator configuration |
HA two system (for example PowerHA® for AIX®) |
HA single system (for example MPIO) |
|---|
| RAID (disks formatted RAID block size per sector) |
- Maximum of two controllers
- Both controllers must have same write cache capability and write
cache sizes
- Both controllers must support "HA two-system RAID"
- Controllers are in different systems or partitions
|
- Maximum of two controllers
- Both controllers must have same write cache capability and write
cache sizes
- Both controllers must support "HA single-system RAID"
- Controllers are in the same system or partition
|
| JBOD (disks formatted JBOD block size per sector) |
- Maximum of two controllers
- Both controllers must support HA two-system JBOD
- Controllers are in different systems or partitions
- Requires unique setup and cabling
|
|
The following figures illustrate an example of each configuration.
