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As mentioned previously, the S402 supports various RAID modes. Figure 14 shows the menu where the mode can be specified.

RAID Specification

Figure 14: TS-S402 RAID Specification

In this case, I have the device configured in RAID1 mode where data is mirrored to each drive to protect against disk failure, the downside being cutting my total disk capacity in half. As you can see, the other RAID modes supported are 0, where the data is spread across two drives for additional performance but no fault-tolerance, and JBOD where the two drives are just logically combined to look like a big single drive.

When problems do occur in the system, the S402 has an email-alert mechanism so that you can get notified of the failure. Figure 15 shows the alert setup capabilities found somewhat incongruously in the "Remote System Log" menu.

Alert Setup

Figure 15: TS-S402 Alert Setup

To test the RAID recovery feature and the alert mechanism, I opened up the case and yanked the cable off one of my two drives. I expected to see some immediate reaction, but I saw nothing. Even the two disk LEDs remained lit. When I checked my email, I had nothing, but a check of the logging feature of the box (Figure 16) showed that the removal had been detected.

Disk Failure

Figure 16: TS-S402 Disk Failure

While the disk was out, I could access my data as if nothing had happened, which is the benefit of using RAID 1. To check out recovery, I shut the system down (since hot-swapping is not supported), re-plugged the drive and powered the system back up.

Once again, I had to dig a bit to find out what was going on. Figure 17 shows the log that indicated that the drive rebuild was automatically started and underway.

RAID Recovery

Figure 17: TS-S402 RAID Recovery

While the rebuild was underway, my data was available as before, but with reduced performance. It was nice to have the automatic rebuild, but I expected to get more notification, e.g. blinking lights, buzzers, or email (more on this later) telling me that something had gone badly wrong. Since I only had 80GB disks in the system, my rebuild time was fairly short - about 30 minutes.

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