After setting the cluster’s security settings to enhanced for all these nodes, you can verify that it is working as expected, for example, by running clverify, which goes out to the nodes and checks the consistency of files.
9.3 VSDs - RVSDs
VSDs (Virtual Shared Disks) and RVSDs (Recoverable Virtual Shared Disks) are
9.3.1 Virtual Shared Disk (VSDs)
Virtual Shared Disk (VSD) allows data in logical volumes on disks physically connected to one node to be transparently accessed by other nodes. Importantly, VSD supports only raw logical volumes, not file systems. The VSD facility is included in the ssp.csd.vsd fileset of PSSP.
IBM developed VSD to enable Oracle’s parallel database on the SP. Oracle’s database architecture is strongly centralized. Any processing element, or node, must be able to “see” the entire database. In the case of the parallel implementation of Oracle, all nodes must have access to all disks of the database, regardless of where those disks are physically attached.
Node X | Node Y |
| |
Application | Application | ||
Cache | VSD | VSD | Cache |
LVM | IP | IP | LVM |
Disk DD | Net DD | Net DD | Disk DD |
|
| IP Network (SP Switch) |
|
lv_X |
|
| lv_Y |
