Replacing the S3400-H SCSI RAID drive

The S3400-H uses a Redundant Array of Independent Disks (RAID) storage system to protect against customer data loss. Three Small Computer System Interface (SCSI) drives provide RAID level 5 redundancy, which combines data striping and distributed parity checking. If a SCSI drive fails, the system automatically rebuilds the data after a new SCSI drive is installed.

Note: If all the disk drives in a system are damaged (for example, due to a lightning strike), then you need to replace the entire unit. See Replacing the system server for this procedure.

Replacing a SCSI RAID drive

The S3400-H allows disks to be removed and replaced in a SCSI RAID disk-drive assembly while the system continues to provide service. All SCSI drives are considered "hot swappable" and can be replaced while the system is in service.

To replace a SCSI RAID drive in an S3400-H:

1. Verify that the replacement equipment is on site and appears to be in usable condition, with no obvious damage.
2. Remove the faulty drive.
3. Install the new drive and verify operation.

Remove the faulty drive

To remove a faulty SCSI RAID drive:

1. Remove the bezel (plastic cover) on the front of the chassis. See Removing or replacing the front bezel.
1. Press down on the two tabs on the top of the bezel.
2. Rock the bezel forward, and then lift it out.
2. Locate the drive to replace as follows:
• Drive 0 (d0b0t0d0): the top drive, closest to the DVD-RAM drive.
• Drive 1 (d0b0t1d0): the middle drive.
• Drive 2 (d0b0t2d0): the bottom drive.
3. Loosen the retaining screw on the handle (latch) for the faulty SCSI RAID drive.
4. Open the latch to unseat the old disk drive, then pull it by the handle from the drive cage. See figure Removing or replacing a SCSI RAID drive.

Caution! Wait at least 1 minute after removing the old SCSI drive before installing the new one. This gives the system time to sense the installation of the new drive.

Install the new drive and verify operation

To install a new SCSI RAID drive and verify that full service is being restored:

1. Position the replacement drive in the correct orientation in the chassis.
2. Gently slide the drive into the machine, then close the latch to seat it firmly in place. See Removing or replacing a SCSI RAID drive.

Note: The LED for the new drive (HDD-0, HDD-1, or HDD-2) lights, indicating that the system has recognized the new drive and has begun to reconstruct the data from the other two drives. It takes at least 1 minute before the rebuild starts and status information appears. The console then displays a "rebuild started" message.

3. Tighten the retaining screw.

Note: For safety reasons, tighten the retaining screw with a screwdriver until it cannot be loosened by hand.

4. Replace the bezel (plastic cover) on the front of the chassis. See Removing or replacing the front bezel.
1. Insert the bottom of the bezel into the chassis.
2. Push the bezel upright until the two upper tabs snap into place under the top cover.
5. Verify that the disk rebuild procedure is underway. See Retrieving hard disk drive information.

The entire rebuild procedure can take up to 10 hours.

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