Home » Dell Manuals » Servers » Dell DX6004S » Manual Viewer

Dell DX6004S Dell DX Object Storage Platform User’s Guide - Page 33

Recovering From Disk Failures, Detecting and Monitoring Disk Failures

Add to My Manuals
Save this manual to your list of manuals

Page 33 highlights

Recovering From Disk Failures NOTE: The DX Cluster Services Node system's internal disk storage is preconfigured as RAID 5. Single Disk Failure 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. 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 for recovering from operating system failure listed in Table 5-1. 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 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 33

Section	Page
Introduction	7
Table 1-1. Terms Used in the Document	8
2	9
DX Object Storage Platform Overview	9
Network Topologies	9
Local Cluster Configuration	10
Figure 2-1. Local Cluster Configuration	12
Redundant DX Cluster Services Nodes	13
Figure 2-2. Redundant DX Cluster Services Nodes	14
Subcluster Configuration	15
Figure 2-3. Subcluster Configuration	16
Remote Cluster Configuration	17
Figure 2-4. Multiple Cluster Configuration	18
Application Access to DX Object Storage Platform	19
Communicating With a Local Cluster	19
Communicating With a Remote Cluster	19
3	21
Setting Up the DX Object Storage Platform	21
Installing the Initial Cluster or Redundant Cluster Services Node	21
Configuring the DX Object Storage Platform	21
Adding Additional DX Storage Nodes	22
1 Rack and cable the DX6axyS system	22
2 Turn on the DX6axyS system	22
3 Enable capacity in the DX Cluster Services console	22
Installing the System in a Rack	22
Cabling the Appliance	23
Turning On the DX Storage Node	23
Enabling Capacity in DX Cluster Services Console	23
Adding Network Adapter to DX Storage Nodes	23
1 Turn off the DX Storage Node.	23
2 Follow the steps to add a network adapter in the Dell DX6axyS system Hardware Owner's Manual.	23
3 Connect the Ethernet ports to the private network.	23
4 Turn on the DX Storage Node.	23
Adding Network Adapters to DX Cluster Services Nodes	24
1 Turn off the DX Cluster Services Node.	24
2 Follow the steps in the Dell DX6a00 system Hardware Owner's Manual to add a network adapter.	24
3 Connect the Ethernet cable(s) for the external and internal network accordingly. See Figure 3-1.	24
4 Turn on the DX Cluster Services Node.	24
5 Change the IP address of the external network interface to a new valid IP address from the Content Services Configuration page of the DX Cluster Services Administration console.	24
Figure 3-1. Ethernet Cable Connections to the External and Internal Networks	24
4	25
Updating the Dell DX Object Storage Platform Software	25
Checking Software Version Compatibility	26
Using the DX Object Storage Platform Compatibility Manager	26
Table 4-1. Status Levels	26
1 Open the file /opt/dell/dellACM/CMREPORT.TXT on the primary Cluster Services Node.	27
2 Review the status information for the Cluster Services Node and the individual Storage Nodes.	27
3 For more detailed component status information, run the following command:	27
Troubleshooting the Compatibility Manager	27
Updating the DX Cluster Services Node Software	28
Updating the DX Storage Node Software	28
1 Install the new rpm using the following command:	29
2 To view the DX Storage Node software version, click Cluster ServicesÆ Netboot Management.	29
3 From the Netboot Management page, select the newly installed storage node software and reboot the DX Storage Cluster to apply the new software version.	29
Receiving System Software Update Notifications	29
1 Go to support.dell.com/support/downloads.	29
2 Click on the Technical Subscriptions link under the Drivers and Downloads section.	29
Updating OpenManage Server Administrator	29
1 Go to support.dell.com/support/downloads.	29
2 Select OpenManage Server Administrator Managed Node under the Systems Management category.	29
3 Follow the installation instructions provided on the download page.	29
5	31
Disaster Recovery	31
Recovery Solution Map	31
Table 5-1. System Recovery Map	32
Hardware	32
Software	32
Recovering From Disk Failures	33
Single Disk Failure	33
Two Disk Failure	33
Detecting and Monitoring Disk Failures	33
Reinstalling the Operating System	34
1 Replace the failed disks.	34
2 Create a RAID 5 disk group across all disks of the DX Cluster Services Node.	34
3 Reinstall the operating system. For more information on replacing the drive, see \	34
Configuring and Managing RAID	34
Recovering the Operating System	35
Configuring the Partitions During Operating System Recovery	35
1 On the Linux Partition Configuration screen, select the Review and Modify Partitioning Layout option.	35
2 Click Next.	35
3 Click New.	35
4 In the Allowable Drives field, de-select the sdb volume.	35
5 Create a 10 GB restore partition of the file system type physical volume (LVM) within the sda and click OK.	36
6 Select /dev/sdb1 from the Device list and click Edit.	36
7 Select Format partition as ext3.	36
8 In the Mount Point field, enter /u01 and click OK.	36
9 Click Next.	36
1 Identify the disk to be formatted. To identify the disk to be formatted, run the following command:	36
2 Create a partition on the /dev/sdb block device using parted:	36
3 Create a gpt label on the block device:	36
4 Create a partition that consumes the entire available space on /dev/sdb:	36
5 Create a file system on the formatted partition table. For example, run the following command:	36
6 Create the /u01 directory in root directory and mount the file system to the /u01 directory. For example, run the following command:	36
7 To keep the mount path persistent across reboot, add the mount path to /etc/fstab. For example, run the following command:	37
Table 5-2. Options to Create a Mount Path	37
Reinstalling the DX Cluster Services Node Software	37
Setting Up and Configuring the Network	37
Connecting the DX Cluster Services Node to the Private and Public Networks	38
Connecting the DX Storage Nodes to the Private Network	38
Creating a Local YUM Repository on the DX6000 System	38
1 Turn on the DX Cluster Services Node.	38
2 Insert the operating system media that came with the system into the optical drive and allow the file system to auto mount. Th...	38
3 Define the repository where your copy of rpm packages are stored. To define the repository, create a new file in /etc/yum.repos.d named rhel- dvd.repo using the following commands:	39
4 Change the following lines in rhel-dvd.repo file:	39
5 Remove any cached packages from the system and enable the local YUM repository:	39
Installing Dell DX Compatibility Manager	40
1 Download the latest version of rpm package from support.dell.com.	40
2 Copy the rpm package to a directory on your system.	40
3 Install the rpm package using the following command:	40
Installing Dell OpenManage Server Administrator	40
Installing DX Cluster Services Node Software	41
1 Download the latest version of the DX Cluster Services Node software distribution available online at support.dell.com/downloads.	41
2 Copy the distributed zip file to your DX Cluster Services Node system and unzip it into the directory of your choice.	41
3 Install the DX Cluster Services Node software by running the self-extracting script from inside the bundle directory location where the shell script was unzipped.	41
4 Eject the operating system media from the optical drive using the following command:	41
5 Reboot the DX6a00 system when the installation completes.	41
Configuring the DX Cluster Services Node Software	42
Restoring the Cluster Configurations	42
Bringing Up the DX Storage Cluster	42
6	43
Additional References	43
Software Documents	43
Table 6-1. Software Documents	43
Hardware Documents	44
Table 6-2. Hardware Documents	44
Systems Management Documents	46