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Recovering From Disk Failures

NOTE:

The DX Cluster Services Node system's internal disk storage is

preconfigured as RAID 5.

RAID 5 provides uninterrupted operation of the system if a single disk fails. If

a single disk failure occurs, replace the failed hard drive. For more

information, see Dell DX6a00 systems Hardware Owner's Manual at

support.dell.com/manuals. After the hard drive is replaced, it is automatically

assigned by the RAID controller and rebuilt into the disk group. After the disk

group is rebuilt, the RAID 5 disk group continues to operate normally.

CAUTION:

If a second drive fails before the disk group rebuild is complete, data

loss occurs.

If the system experiences a two disk failure, the RAID 5 group must be

reconfigured and the operating system must be reinstalled. Follow the steps

for recovering from operating system failure listed in Table 5-1.

To optimize the protection of the RAID group on the system, it is essential

that you detect hard drive failures immediately. Replacing failed disks

immediately reduces the risk of unplanned downtime and loss of critical data.

Ensure that you replace the failed disk with a new disk of the same or greater

capacity. If drives of greater capacity are used, some usable disk space is lost in

the RAID 5 configuration.

You can use the following methods to monitor the health of the disks:

•

Hard drive LED indicators—Monitors the drive activity and reports

failures. For more information, see the Dell DX6a00 Hardware Owner's

Manual at support.dell.com/manuals.

•

Dell OpenManage Server Administrator—Monitors the health of the

internal disks.

Disaster Recovery