Hp Hitachi Dynamic Link Manager Software Uživatelský manuál stáhnout pdf (Strana 170)

3. Creating an HDLM Environment

146

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 for the number of times an error needs to occur,

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

is satisfied.

To determine whether a path is invalid for an automatic failback, you can use the

results of the

dlnkmgr command's view operation.

• Setting up intermittent error monitoring by using the

set operation

The following is an example of setting up intermittent error monitoring by using

a command:

>dlnkmgr set -iem on -intvl 20 -iemnum 2

specifies that intermittent error monitoring is to be used. To disable

intermittent error monitoring, specify

off. When you set this parameter to on,

you can specify intermittent error conditions by using the

-intvl and -iemnum

parameters. Specify the monitoring interval for an intermittent error in the

-intvl parameter, and the number of times that the error needs to occur in the

-iemnum parameter. When these parameters are omitted, the default values of 30

and 3 are used, respectively.

(5) Setting Up the LU Deletion Function

For details on the LU deletion function, see 4.7.2 Deleting an LU Dynamically.

Table 3-15: LU Deletion Function Values shows the possible values for the LU

deletion function.

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 491 492

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Hp Hitachi Dynamic Link Manager Software Uživatelský manuál Strana 170