##

### To Custom-Configure an Array

Caution - Before you reconfigure an existing array, note that any information you enter and save at this page overwrites the existing information for the array.

1. Click Individual Configuration at the Array Management page.
2. Select a storage array in the table and click Custom Configuration.

You can also configure a Fibre Channel array settings from this page. See To Configure Fibre Channel Port Settings.

3. Type a description of the array in the Description text field.

The maximum number of characters allowed is 26.

4. Select or enable the following:

- Segment Size

You can choose a LUN segment size of 16 Kbytes, 32 Kbytes, or 64 Kbytes. In a RAID-5 configuration, the segment size is the size of the data striped across volumes.

- Read Ahead cache mode

Select On to enable it or select Off to disable it.

- Disk Reconstruction Rate

Selecting high might impact system I/O performance; selecting low might increase system I/O performance.

- Failover Mode

Select Explicit LUN Failover or Implicit LUN Failover.

- Cache Mode

off - disable the cache mode.

auto - use write-behind or write-through caching depending on I/O characteristics.

writebehind - write all read and write operations to cache.

writethrough - write data to cache and then to disk.

5. Click Save.