3.1.2 Matrix Server Administration Guide

Chapter 18: SAN Maintenance 241

The following example shows the operation of the command:

$ mx server markdown 99.10.20.4

This utility is used to verify that a server is down in the

event that it cannot be fenced and cannot be rebooted.

IMPORTANT: This utility must be run only after the server has

been physically verified to be down. If the server is not

down, running this utility could result in filesystem

corruption.

Do you wish to continue? y

SUCCESS 99.10.20.4 has been marked as down.

CAUTION:

Be sure to verify that the server is physically down before

running the mx server markdown command. Filesystem

corruption can occur is the server is not actually down.

If mx server markdown is called for a server that is up and in

communication with the matrix, the following message will be displayed

when you run the command:

Do you wish to continue? y

ERROR 99.10.20.3 is not down!

If the command is run for a server that is up but out of communication

with the matrix (for example, the server has lost network connectivity but

has not been rebooted), the mx server markdown command will succeed.

However, if the server later regains network connectivity to the matrix, an

alert such as the following will be displayed:

Operator error may have caused filesystem corruption!

99.10.20.4 returned to the matrix without being rebooted,

even though the operator verified that 99.10.20.4 was down.

It is recommended that all filesystems that 99.10.20.4 had

mounted be checked for corruption. This alert will display

for 48 hours.