Understanding and Designing Serviceguard Disaster Recovery Architectures

6, 8, 10, 12, 14 or 16 nodes, for distances of up to 10 kilometers, and for 2 or 4 nodes for
distances of up to 100 kilometers.
Using Mirrordisk/UX and Shared LVM with Serviceguard Extension for RAC (SGeRAC), you can
create a 2 or 4 node Extended Cluster for RAC for distances of up to 100 kilometers. Because
RAC uses the network for lock passing (Oracle’s Cache Fusion feature), link distance and latency
may impact application performance. Make sure that you involve Oracle to review the impact on
RAC performance.
NOTE: Ensure that the patches, PHSS_40783 (for 11i v2) or PHSS_40784 (for 11i v3) or later,
are installed on all nodes if LVM Mirroring is used with Serviceguard A.11.19.
Extended Distance Cluster configurations support two or three data center solutions using
MirrorDisk/UX or Veritas VxVM mirroring on HP-UX or Multiple Device (MD software RAID) for
Linux and Fibre Channel disk arrays for data replication between the data centers.
See Table 2 (page 51) for the maximum supported distances between data centers for Extended
Distance Cluster configurations on HP-UX 11i v1.
Table 2 Extended Clusters Support for HP-UX 11i v1
Notes for Extended Cluster SupportVolume ManagerRevisionProduct
Supports up to 16 nodes for distances up to 100 KM.LVMA.11.16Serviceguard
3.5 only. Supports up to 16 nodes for distances up to 100 KM.VxVM
Supports up to 2 nodes for distances up to 100 KM. Oracle 9.2 or 10gR2.SLVMA.11.16SGeRAC
1
3.5 only. Supports 2, 4, 6 or 8 nodes for distances up to 10 KM (more
than 4 nodes requires patch), or 2 nodes for distances up to 100 KM.
Oracle 9.2 only.
CVM
1
LVM and VxVM support in SGeRAC is the same as that provided by the equivalent Serviceguard
revision.
See Table 3 (page 51) for the maximum supported distances between data centers for Extended
Distance Cluster configurations on HP-UX 11i v2.
Table 3 Extended Clusters support for HP-UX 11i v2
Notes for Extended Cluster SupportVolume ManagerRevisionProduct
Supports up to 16 nodes for distances up to 100 KM.LVMA.11.16Serviceguard
3.5 only. Supports up to 16 nodes for distances up to 100 KM.VxVM
Supports up to 16 nodes for distances up to 100 KM.LVMA.11.17 –
A.11.19
3.5, 4.1, or 5.0. Supports up to 16 nodes for distances up to 100
KM.
VxVMA.11.17 –
A.11.18
4.1 or 5.0. Supports up to 16 nodes for distances up to 100 KM.VxVMA.11.19
Supports up to 2 nodes for distances up to 100 KM. Oracle 9.2
or 10gR2.
SLVMA.11.16SGeRAC
1
3.5 only. Supports 2, 4, 6, or 8 nodes for distances up to 10 KM
(more than 4 nodes requires patch), or 2 nodes for distances up
to 100 KM. Oracle 9.2 only.
CVM
Supports up to 2 nodes for distances up to 100 KM. Oracle 9.2,
10gR2 or 11gR1.
SLVMA.11.17
3.5 or 4.1. Supports 2, 4, 6, or 8 nodes for distances up to 10
KM (more than 4 nodes requires patch), or 2 nodes for distances
up to 100 KM. Oracle 9.2 or 10gR2 (4.1 only for 10gR2).
CVM
Extended Distance Cluster on HP-UX 51