Logical unit settings for IBM DS5000, IBM DS4000, and IBM DS3000 systems
Logical unit (LU) settings are configurable at the LU level.
LUs that are accessed by hosts can be configured differently. Use the following option settings for a LUN that is attached to the system.
| Parameter | Setting |
|---|---|
| Segment size | 256 KB |
| Capacity that is reserved for future segment size changes | Yes |
| Maximum future segment size | 2,048 KB |
| Modification priority | High |
| Read cache | Enabled |
| Write cache | Enabled |
| Write cache without batteries | Disabled |
| Write cache with mirroring | Enabled |
| Flush write cache after (in seconds) | 10.00 |
| Dynamic cache read prefetch | Enabled |
| Enable background media scan | Enabled |
| Media scan with redundancy check | Enabled |
| Pre-Read redundancy check | Disabled |
You must not have caching without batteries that are enabled.
Set the host type for
the system to IBM TS SAN VCE when you create a new LU.