Dell DX6000 User Manual

Also see for DX6000: Manual Supplementary guide Hardware installation instructions Hardware owner's manual Application guide

Contents

Dell DX6000 User Manual Manual pdf 33 page image

Disaster Recovery 33Recovering From Disk FailuresNOTE: The DX Cluster Services Node system's internal disk storage ispreconfigured as RAID 5.Single Disk FailureRAID 5 provides uninterrupted operation of the system if a single disk fails. Ifa single disk failure occurs, replace the failed hard drive. For moreinformation, see Dell DX6a00 systems Hardware Owner's Manual atsupport.dell.com/manuals. After the hard drive is replaced, it is automaticallyassigned by the RAID controller and rebuilt into the disk group. After the diskgroup is rebuilt, the RAID 5 disk group continues to operate normally.CAUTION: If a second drive fails before the disk group rebuild is complete, dataloss occurs.Two Disk FailureIf the system experiences a two disk failure, the RAID 5 group must bereconfigured and the operating system must be reinstalled. Follow the stepsfor recovering from operating system failure listed in Table 5-1.Detecting and Monitoring Disk FailuresTo optimize the protection of the RAID group on the system, it is essentialthat you detect hard drive failures immediately. Replacing failed disksimmediately 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 greatercapacity. If drives of greater capacity are used, some usable disk space is lost inthe 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 reportsfailures. For more information, see the Dell DX6a00 Hardware Owner'sManual at support.dell.com/manuals.• Dell OpenManage Server Administrator—Monitors the health of theinternal disks.