Dell DX6000G Dell DX Object Storage Platform User's Guide - Page 35

Recovering From Disk Failures, Single Disk Failure, Two Disk Failure

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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. 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 system's Hardware Owner's Manual at support.dell.com/manuals. • Dell OpenManage Server Administrator-Monitors the health of the internal disks. Disaster Recovery 35

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Disaster Recovery
35
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.
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 system’s
Hardware Owner's Manual
at
support.dell.com/manuals
.
•
Dell OpenManage Server Administrator—Monitors the health of the
internal disks.