White Papers
Table Of Contents
- Executive Summary (updated May 2011)
- 1. Introduction
- 2. Dell NFS Storage Solution Technical Overview
- 3. NFS Storage Solution with High Availability
- 4. Evaluation
- 5. Performance Benchmark Results (updated May 2011)
- 6. Comparison of the NSS Solution Offerings
- 7. Conclusion
- 8. References
- Appendix A: NSS-HA Recipe (updated May 2011)
- A.1. Pre-install preparation
- A.2. Server side hardware set-up
- A.3. Initial software configuration on each PowerEdge R710
- A.4. Performance tuning on the server
- A.5. Storage hardware set-up
- A.6. Storage Configuration
- A.7. NSS HA Cluster setup
- A.8. Quick test of HA set-up
- A.9. Useful commands and references
- A.10. Performance tuning on clients (updated May 2011)
- A.11. Example scripts and configuration files
- Appendix B: Medium to Large Configuration Upgrade
- Appendix C: Benchmarks and Test Tools
Dell HPC NFS Storage Solution - High Availability Configurations
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Appendix B: Medium to Large Configuration Upgrade
The Medium configuration consists of one PowerVault MD3200 and one PowerVault MD1200 and provides
capacity of about 40TB. The Large configuration consists of one PowerVault MD3200 and three
PowerVault MD1200s with a capacity of about 80TB.
To upgrade from a Medium configuration to a Large configuration, the two additional PowerVault
MD1200s must be identical in configuration to the original set-up. Cable the two additional PowerVault
MD1200s to the storage.
Similar to the storage configuration done for the initial Medium configuration, create a RAID 6, 10+2
virtual disk with segment size 512k on each new PowerVault MD1200. Add this virtual disk into the host
group so that both active and passive servers can access the two new LUNS.
There are two paths to expand the XFS file system from a Medium configuration to a Large
configuration.
Option 1: Extend the Medium configuration by an additional 40TB of capacity keeping the current file
system intact. In this case:
The first 40TB of data is stored on the original Medium configuration of one PowerVault
MD3200 and one PowerVault MD1200. Data is striped across the PowerVault MD3200 and the
first PowerVault MD1200.
The second 40TB of data is striped across the two additional PowerVault MD1200s.
The total capacity of the system is 80TB, similar to a Large configuration.
The performance of the storage is similar to a Medium configuration.
The file system and user data stay intact during the upgrade. However, it is recommended
that the user data be backed up before the upgrade.
Option 2: The second option is to create a Large configuration on the storage. In this case:
The user data must be backed up externally. This is a requirement. Data will not be
preserved.
The volume group, logical volume and file system is re-created using all four PowerVault
MD storage enclosures. All 80TB of data is stripped across all four PowerVault MD arrays.
The total capacity of the system is 80TB.
The performance of the system is like a Large configuration.
User data must be restored after the upgrade.
Implementing Option 1- Extending the Medium configuration
These steps must be executed on the server currently running the cluster service.
1) Backup user data.
2) Create new physical volumes on the two new LUNS.
pvcreate /dev/mapper/mpath4 /dev/mapper/mpath5
3) Extend the existing volume group to include these new physical volumes.
vgextend DATA_VG /dev/mapper/mpath4 /dev/mapper/mpath
4) Extend the existing logical volume to include these new physical volumes.