Logical unit (LU) settings are configurable at the LU level.
EMC CLARiiON LU settings that the system supports lists the options that must be set for each LU that thesystem accesses. LUs that are accessed by hosts can be configured differently.
| Option | EMC CLARiiON default setting | Required system setting |
|---|---|---|
| LU ID | Auto | N/A |
| RAID Type | 5 | Any RAID Group |
| RAID Group | Any available RAID Group | Any available RAID Group |
| Offset | 0 | Any setting |
| LU Size | ALL LBAs in RAID Group | Any setting |
| Placement | Best Fit | Either Best Fit or First Fit |
| UID | N/A | N/A |
| Default Owner | Auto | N/A |
| Auto Assignment | Disabled | Disabled |
| Verify Priority | ASAP | N/A |
| Rebuild Priority | ASAP | N/A |
| Strip Element Size | 128 | N/A |
| Read Cache Enabled | Enabled | Enabled |
| Write Cache Enabled | Enabled | Enabled |
| Idle Threshold | 0–254 | 0–254 |
| Max Prefetch Blocks | 0–2048 | 0–2048 |
| Maximum Prefetch IO | 0–100 | 0–100 |
| Minimum Prefetch Size | 0–65534 | 0–65534 |
| Prefetch Type | 0, 1, or 2 | 0, 1, or 2 |
| Prefetch Multiplier | 0 - 2048 or 0 - 324 | 0 - 2048 or 0 - 324 |
| Retain prefetch | Enabled or Disabled | Enabled or Disabled |
| Prefetch Segment Size | 0 - 2048 or 0 - 32 | 0 - 2048 or 0 - 32 |
| Idle Delay Time | 0 - 254 | 0 - 254 |
| Verify Priority | ASAP, High, Medium, or Low | Low |
| Write Aside | 16 - 65534 | 16 - 65534 |