OWC Express 4M2 Assembly Manual & User Manual page 10

• Mirrored (RAID 1) set:
Protect your data against hardware failure with a
mirrored RAID set
When you create a mirrored RAID set, your data is written to multiple disks so the
information is stored redundantly. You can't create a RAID set on your startup disk;
you must first start up your computer from another disk.
• Concatenated (JBOD) set:
Increase storage space with a
concatenated disk set
If you need one large disk, but you have several smaller disks, you can create a
concatenated disk set to use as one large disk.
5. Select the checkboxes of the disks you want to include in the set.
6. For each disk, click the pop-up menu in the Role column and choose "RAID slice" or
"Spare" to designate the disk as a standard member or spare in the set, then click
Next.
7. Enter a name for the RAID set in the RAID Name field.
8. Click the Format pop-up menu, then choose a volume format that you want for all the
disks in the set. (See
File system formats available in Disk Utility
.)
9. Click the "Chunk size" pop-up menu, then choose a disk chunk size that you want
used for all the disks.
1. When you create a striped set, chunks of data from the same file are distributed
across the drives. Ideally, you want data distributed across drives evenly and at an
optimum size so that it can be efficiently accessed. If you want high data throughput
from your set, choose a smaller chunk size so that data is spread across the drives
and one drive can be accessing data while another is seeking the next chunk. With
mirrored disk sets, choose a chunk size that matches the data you're accessing. For
example, when working with video files, your Mac is accessing large chunks of data,
whereas when using a database of many small records, your disks may be accessing
smaller chunks of information.
1. If you are creating a mirrored RAID set, select the "Automatically rebuild" checkbox to
allow the set to be automatically rebuilt when member disks are reconnected
2. Click "Create" and then click "Done".