User's Manual

Disaster Recovery Scenarios For Fluid Cache For

DAS

To resolve issues with your Fluid Cache For DAS, see Troubleshooting Fluid Cache For DAS. If the Dell Technical Support

contact requests for running fldccollect.pl or fldc_restore, see the sections below.

Data Collection Utility For Fluid Cache For DAS

fldccollect.pl is a Fluid Cache for DAS data-collection utility for use by Dell Technical Support in analyzing

issues.

CAUTION: Do not run this utility except under the direction and supervision of Dell Technical Support.

1. Navigate to the following directory: /opt/dell/fluidcache/bin

2. At the prompt, run the script with super user permissions using sudo, and type: ./fldccollect.pl

While collecting data, fldccollect.pl provides some tracking messages. When finished,

fldccollect.pl creates a tar.gz archive in the /tmp directory.

3. Follow the instructions from Dell Technical Support to send the archive to Dell Technical Support for analysis.

Restoring Fluid Cache For DAS Configuration

Fluid Cache for DAS has a restore utility, fldc_restore, that you can use to restore your caching configuration in the

event of a disaster. Fluid Cache for DAS maintains three journals that are mirror copies of your Fluid Cache for DAS

configuration. Using fldc_restore, you can locate the most recent configuration and restore that configuration to the

new Fluid Cache for DAS installation on a re-built system.

For the restore process to be successful, you must know the UID for at least one of the PCIe SSDs on the system. When

you use the UID, also called WWN, with the restore utility, the utility locates the PCIe SSD. The utility then finds the

journal associated with that PCIe SSD, finds all of the other journals in the configuration, determines which journal is the

latest, and then recreates the missing configuration file that contains the last known Fluid Cache for DAS configuration.

NOTE: To obtain at least one WWN, run the following command: ./dev2wwn /dev/<pcie_ssd_name>

The command returns the UID for the target PCIe SSD.

1. In the event of a disaster, after the system is rebuilt and all the associated software is reinstalled, navigate to the

directory: /opt/dell/fluidcache/bin

2. Run the command: ./dev2wwn /dev/<pcie_ssd_name>

For example: ./dev2wwn /dev/rssda

The command returns the UID for the target PCIe SSD. For example: Path /dev/rssda is WWN

500A07510202EE60

3. Run the command: ./fldc_restore <wwn>

For example: ./fldc_restore 500A07510202EE60