First-Time Configuration
Manual No. 775029
1-15
• Fault Tolerance = YES, AND
• Number of Available
1
Drives on Controller > 2
☛
Note
If you have only two available drives on this
controller, you’ll get a RAID 1 (mirroring)
configuration, which optimizes for performance. You
will, therefore, NOT see the Optimization Priority
choice screen.
Assuming your situation meets the conditions above, the Optimization
Priority screen is displayed (Figure 1-10).
Figure 1-10. Optimize for Capacity?
At this point you choose whether available capacity or array performance is
the top criterion in your fault tolerant array. If you choose Capacity, you’ll be
requesting a RAID 5 (striping with parity) configuration. If you choose
Performance, you’ll be requesting a RAID 0+1 (striping with mirroring)
configuration. Both give you the safety of fault tolerance. RAID 5 provides
the best combination of settings for most applications and has overhead of
only one drive’s capacity. RAID 0+1 has a write performance advantage over
1. “Available” drives are both unconfigured AND not reserved as a
spare.
