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### Eighteen-Node Cluster With Netra CT 820 Server Following is an example of a hardware configuration for an 18-node cluster: One Netra CT 820 server fitted with the following: Two Netra CP2300 system controller boards configured as master-eligible nodes Sixteen Netra CP2300 satellite processor boards configured as diskless nodes Two Distributed Management Cards (alarm cards) One Sun StorEdge 3310 disk array Two Ethernet switches A terminal server to manage the consoles (Optional) Supplemental PMC (PCI Mezzanine Card) Ethernet cards on each CP2300 board to configure the external network of the master-eligible nodes ## Considerations for Choosing a Hardware Configuration The Foundation Services run on a range of Netra servers that have different characteristics. The following sections describe some of the implications of choosing one type of Netra server over another type of Netra server as your cluster hardware. ### Types of Disks Foundation Services support SCSI, FC-AL, and IDE disks. #### SCSI Disks Netra T1, Netra 120, and Netra 240 servers contain SCSI disks. The CP2140 boards also contain SCSI disks. CP2300 cards can be used with SunStorEdge 3310 disk arrays. #### FC-AL Disks Netra 20 servers contain FC-AL disks. To use FC-AL disks, you must install the volume management feature of the Solaris operating system for all partitions managed by Sun StorEdge™ Network Data Replicator (SNDR). The disk scanning mechanism of these FC-AL disks does not guarantee that the slot positions of the disks provide unique, reproducible unit numbers when the disks are plugged on FC-AL. To remove this constraint, you must create a disk partition on each master-eligible node to store the volume management metadevice database. For details on how to install and configure the volume management feature for FC-AL disks while using the `nhinstall` tool, see the Netra High Availability Suite Foundation Services 2.1 6/03 Custom Installation Guide and the `cluster_definition.conf`(4) man page. #### IDE Disks The CP2300 boards can accept optional IDE disks. For information about configuring the Foundation Services for IDE disks, see the Netra High Availability Suite Foundation Services 2.1 6/03 Custom Installation Guide. ### Types of Hardware Watchdogs There are two types of hardware watchdogs for use with Netra servers and boards: Watchdogs located at the Lights-Off Management (LOM) level Watchdogs located at the OpenBoot™ PROM (OBP) level CompactPCI boards have OBP-level watchdogs. These watchdogs can be enabled by specifying the value `true` for the `watchdog-enable?` parameter at the `ok` prompt. These hardware watchdogs are monitored by the platform's software eliminating the need to use the Foundation Services Watchdog Timer. The following table lists the type of watchdog that is available on each type of Netra server and board. Table 2-1 Types of Hardware Watchdogs
Servers and Boards | Type of Hardware Watchdog
--- | ---
Netra T1 servers | LOM-level hardware watchdog
Netra 20 servers | LOM-level hardware watchdog
Netra 120 servers | LOM-level hardware watchdog
Netra 240 servers | LOM-level hardware watchdog
CP2140 boards | OBP-level hardware watchdog
CP2160 boards | OBP-level hardware watchdog
CP2300 boards | OBP-level hardware watchdog
Use the Foundation Services Watchdog Timer to monitor the LOMlite 2 hardware watchdogs on the Netra T1, Netra 20, Netra 120, and Netra 240 servers only.
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