Hp Hitachi Dynamic Link Manager Software Manual de usuario descargar pdf (Pagina 214)

100

101

3. Creating an HDLM Environment

192

If you set the number of times that the error needs to occur to 1, the above condition

does not need to be satisfied.

The following is an example of setting up automatic failback by using a command:

# /opt/DynamicLinkManager/bin/dlnkmgr set -afb on -intvl 10

To enable the automatic failback function, set it to on. When on is specified, you can

use the

-intvl parameter to specify the checking interval. If the checking interval is

not specified, the value that was previously specified will be applied. For example,

specify the auto failback as

off after specifying the checking interval to five minutes

and executing. Then, when executing after specifying the auto failback as

on without

specifying the checking interval, the five minutes that were specified previously will

be applied again.

(4) Setting Up Intermittent Error Monitoring

You can set the intermittent error monitoring only when automatic failback is enabled.

To prevent an intermittent error from reducing I/O performance, we recommend that

you monitor intermittent errors when automatic failback is enabled.

When intermittent error monitoring is enabled, you can specify intermittent error

conditions. The default value for the intermittent error-monitoring interval is 30. The

default value for the number of error occurrences is 3.

The system assumes that an intermittent error has occurred if the specified number of

times that the error needs to occur is reached during the specified monitoring interval.

A path that is assumed to have an intermittent error is excluded from performing an

automatic failback. Intermittent error monitoring starts right when the path is

recovered from the error by performing an automatic failback. Monitoring is

performed on each, individual path.

When a value of

2 or more is specified in the number of error occurrence, make sure

that the condition shown in (3) Setting Up the Automatic Failback Function is

satisfied. To determine whether an intermittent error is occurring in a path, you can use

the execution results of the

dlnkmgr command's view operation.

The following shows an example of executing the command to set intermittent error

monitoring.

# /opt/DynamicLinkManager/bin/dlnkmgr set -iem on -intvl 20

-iemnum 2

To enable intermittent error monitoring, set it to on. Otherwise, set it to off. When on

is specified, you can use the

-intvl and -iemnum parameters to specify intermittent

error conditions (the conditions used by the system to determine whether an

intermittent error is occurring). Specify the monitoring interval for an intermittent

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