Dell DX6004S User Manual download pdf (Page 37)

Disaster Recovery 39

Recovering From Disk Failures

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

preconfigured as RAID 5.

Single Disk Failure

The CSN is configured as RAID 5 to ensure 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 Hardware Owner's Manual for the

affected system 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 disk group continues to

operate normally.

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

loss occurs.

Two Disk Failure

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

listed in Table 5-1 to recover from an operating system failure.

Detecting and Monitoring Disk Failures

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 capacity. If

you use drives of greater capacity, some usable disk space is lost in the RAID 5

configuration.

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Dell DX6004S User Manual Page 37