IBM SG24-5131-00 Manual de usuario descargar pdf (Pagina 208)

190 IBM Certification Study Guide AIX HACMP

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 SP-specific facilities that you are likely to use in an HACMP environment.

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.

Figure 17. VSD Architecture

Node X

Application

VSD

LVM IP

Cache

LVMIP

Disk DDNet DD

Node Y

Application

VSD

Cache

Disk DD Net DD

lv_X

lv_Y

IP Network (SP Switch)

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IBM SG24-5131-00 Manual de usuario Pagina 208