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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lvextend /dev/DATA_VG/DATA_LV /dev/mapper/mpath4 /dev/mapper/mpath5 -I
1024 –i 2
5) Extend the file system to include the additional space in the logicial volume.
xfs_growfs -d /mnt/xfs_data
6) Check the new file system size. df –h should show the total size of the file system to be close to
80TB, double what it was earlier.
7) Check that the user data is intact. Restore if needed.
Implementing Option 2 - Creating the Large configuration.
1) Back up user data. This is a requirement. Data will not be preserved.
2) Stop and disable the cluster service. Stop the cluster.
On the server running the cluster service:
clusvcadm –s HA_service
clusvcadm –d HA_service
fence_tool leave
service rgmanager stop
cman_tool leave remove
service cman stop
On the other server:
fence_tool leave
service rgmanager stop
cman_tool leave remove
service cman stop
3) On both servers, edit /etc/lvm/lvm.conf to remove HA_LVM. Comment out the volume_list
line.
4) On both servers, remake the initrd
mkinitrd -f /boot/initrd-2.6.18-194.el5.img 2.6.18-194.el5
5) On one server, remove the old logical volume
lvchange –a y /dev/DATA_VG/DATA_LV
lvremove /dev/DATA_VG/DATA_LV
6) On one server, remove the old volume group.
vgremove DATA_VG
The steps that follow are similar to the NSS HA configuration recipe.
7) On the active server, create new physical volumes on the two new LUNS.
pvcreate /dev/mapper/mpath4 /dev/mapper/mpath5