Veritas Cluster Cheat Sheet printable pdf download

Veritas Cluster Cheat sheet

VCS uses two components, LLT and GAB to share data over the private networks among systems.

These components provide the performance and reliability required by VCS.

LLT (Low Latency Transport) provides fast, kernel-to-kernel comms and monitors network

connections. The system admin configures the LLT by creating a configuration file (llttab)

LLT

that describes the systems in the cluster and private network links among them. The LLT runs

in layer 2 of the network stack

GAB (Group membership and Atomic Broadcast) provides the global message order required to

maintain a synchronised state among the systems, and monitors disk comms such as that required

GAB

by the VCS heartbeat utility. The system admin configures GAB driver by creating a

configuration file ( gabtab).

LLT and GAB files

/etc/llthosts

The file is a database, containing one entry per system, that links the LLT

system ID with the hosts name. The file is identical on each server in the

cluster.

The file contains information that is derived during installation and is

/etc/llttab

used by the utility lltconfig.

/etc/gabtab

The file contains the information needed to configure the GAB driver. This

file is used by the gabconfig utility.

/etc/VRTSvcs/conf/config/main.cf

The VCS configuration file. The file contains the information that defines

the cluster and its systems.

Gabtab Entries

/sbin/gabdiskconf - i /dev/dsk/c1t2d0s2 -s 16 -S 1123

/sbin/gabdiskconf - i /dev/dsk/c1t2d0s2 -s 144 -S 1124

/sbin/gabdiskhb -a /dev/dsk/c1t2d0s2 -s 16 -p a -s 1123

/sbin/gabdiskhb -a /dev/dsk/c1t2d0s2 -s 144 -p h -s 1124

/sbin/gabconfig -c -n2

-i

Initialises the disk region

gabdiskconf

-s

Start Block

-S

Signature

-a

Add a gab disk heartbeat resource

-s

Start Block

gabdiskhb (heartbeat disks)

-p

Port

-S

Signature

-c

Configure the driver for use

gabconfig

-n

Number of systems in the cluster.

LLT and GAB Commands

Verifying that links are active for LLT

lltstat -n

verbose output of the lltstat command

lltstat -nvv | more

open ports for LLT

lltstat -p

display the values of LLT configuration

lltstat -c

directives

lists information about each configured LLT

lltstat -l

link

List all MAC addresses in the cluster

lltconfig -a list

stop the LLT running

lltconfig -U

start the LLT

lltconfig -c

Veritas Cluster Cheat Sheet

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