Subscribe to this information
POWER7 information
Compare important attributes of controller functions.
| Controller functions | HA two-system RAID configuration | HA two-system JBOD configuration | HA single-system RAID configuration |
|---|---|---|---|
| 512 bytes per sector disks supported | No1 | Yes | No1 |
| 528 bytes per sector disks supported | Yes | No | Yes |
| Mirrored write cache between controllers (for controllers that have write cache) | Yes | Yes | |
| Mirrored RAID parity footprints between controllers | Yes | Yes | |
| Dual paths to disks | Yes | No | Yes |
| Target mode initiator device support | Yes | No | No |
| Only IBM® qualified disk drives supported | Yes | Yes | Yes |
| Only IBM qualified disk expansion drawer supported | Yes | Yes | Yes |
| Tape or optical devices supported | No | No | No |
| Boot support | No | No | Yes |
| Operating mode2 | Primary Adapter or Secondary Adapter3 | StandaloneAdapter3 | Primary Adapter or Secondary Adapter3 |
| Preferred Dual Initiator Operating mode2 | None (no preference) or Primary3 | None (no preference) or Primary3 | None (no preference) or Primary3 |
| Dual Initiator Configuration2 | Default3 | JBOD HA Single Path3 | Default3 |
| High-Availability Mode | RAID3 | JBOD3 | RAID3 |
| Manage HA Access Characteristics4 | Yes | No | Yes |
|
|||
