Review the table below for an overview of the different RAID modes:
|RAID mode||Capacity||Protection||Speed||Factory default|
|FAST (RAID 0)||100%||None||Excellent||Yes|
|SAFE (RAID 1)||50%||Excellent||Good||No|
FAST (RAID 0): RAID 0 is the fastest RAID mode. In a RAID 0 array, the available capacities of each hard drive are added together so that one logical volume mounts on the computer. It offers the best performance but no data protection should a hard drive fail.
SAFE (RAID 1): RAID 1 provides data protection since all data is written to each hard drive at the same time. In the event of a single hard drive failure, data remains available on the other hard drive. Due to the time it takes to write the data twice, performance is reduced when compared to RAID 0. RAID 1 is a good choice when safety is more important than speed. However, RAID 1 also reduces the available drive space by 50% due to the need to write every bit of data to each hard drive.
JBOD: Hard drives are independent in a JBOD configuration. You can write data to one hard drive without affecting the other hard drive. An advantage to this configuration is the availability of 100% of the hard drives' total storage capacity. However, it does not offer redundancy and all data on a single hard drive is lost if it fails.
Before starting the steps below, locate the RAID selection tool included with the enclosure and know the RAID mode you want to use.
The table below provides estimated times to configure the RAID.
|RAID||Time to complete|
|FAST||Less than a minute|
|SAFE||Several hours to one or more days (see note below)|
|JBOD||Less than a minute|
The time to complete the RAID SAFE synchronization is based upon total hard drive capacity. Though the time to synchronize may take several hours, you can begin using the volume immediately by initializing it with your operating system's disk utility (see Formatting).
Performance may be affected during RAID synchronization.
In general, the LaCie 2big powers off when the computer is shut down. However, the device remains powered on if it is in the midst of a RAID SAFE synchronization.