Storage Foundation for Oracle® RAC 7.4.1 Administrator's Guide - Linux
- Section I. SF Oracle RAC concepts and administration
- Overview of Storage Foundation for Oracle RAC
- About Storage Foundation for Oracle RAC
- Component products and processes of SF Oracle RAC
- About Virtual Business Services
- Administering SF Oracle RAC and its components
- Administering SF Oracle RAC
- Starting or stopping SF Oracle RAC on each node
- Administering VCS
- Administering I/O fencing
- About the vxfentsthdw utility
- Testing the coordinator disk group using the -c option of vxfentsthdw
- About the vxfenadm utility
- About the vxfenclearpre utility
- About the vxfenswap utility
- Administering the CP server
- Administering CFS
- Administering CVM
- Changing the CVM master manually
- Administering Flexible Storage Sharing
- Backing up and restoring disk group configuration data
- Administering SF Oracle RAC global clusters
- Administering SF Oracle RAC
- Overview of Storage Foundation for Oracle RAC
- Section II. Performance and troubleshooting
- Troubleshooting SF Oracle RAC
- About troubleshooting SF Oracle RAC
- Troubleshooting I/O fencing
- Fencing startup reports preexisting split-brain
- Troubleshooting CP server
- Troubleshooting server-based fencing on the SF Oracle RAC cluster nodes
- Issues during online migration of coordination points
- Troubleshooting Cluster Volume Manager in SF Oracle RAC clusters
- Troubleshooting CFS
- Troubleshooting interconnects
- Troubleshooting Oracle
- Troubleshooting ODM in SF Oracle RAC clusters
- Prevention and recovery strategies
- Tunable parameters
- Troubleshooting SF Oracle RAC
- Section III. Reference
Administering mirrored volumes using vxassist
By default, a volume in disk groups with the FSS attribute set is mirrored across hosts. You can use the vxassist command to create mirrored volume sets spanning across mixed media types, or using a combination of internal disks and external shared disks (i.e. SAN-attached disks).
Note:
In SF Oracle RAC environments that use n-way mirroring, set the nmirror value to the number of nodes in the cluster when you create a mirrored volume. For example, if you have four nodes in the cluster, set the nmirror value to 4.
To create a mirrored volume with HDD and SSD disks
- Create a volume on either the HDD or the SSD disk:
# vxassist -g diskgroup make vol1 maxsize layout=concat init=none
Where diskgroup is the diskgroup name. HDD is selected by default.
- Add a plex based on SSD(s):
# vxassist -g diskgroup mirror vol1 mediatype:ssd
- Activate the volume:
# vxvol -g diskgroup init active vol1
Note:
The mirrored volume may not preserve allocation constraints set.
If you have created a mirrored volume on an SSD disk using the init=none option, you can manually add a new mirror for a DCO volume using the following command:
# vxassist -g diskgroup mirror volume-dcl diskname
Where diskgroup is the diskgroup name and diskname is the name of a disk from the host on which the new data mirror was added. Veritas recommends that you specify the name of a disk on which the data mirror was created.
To create a mirrored volume using internal disks and external physically shared disks
- Create a volume on either the internal disk or the external physically shared disks:
# vxassist -g diskgroup make vol1 maxsize layout=concat init=none host:host1
Where diskgroup is the diskgroup name.
- Add a plex based on external shared disks:
# vxassist -g diskgroup mirror vol1 enclr:emc0
- Activate the volume:
# vxvol -g diskgroup init active vol1
Note:
Specifying the host disk class allocates the volume on the internal storage that is connected to the specified host.