When the system logger service is not used
Estimate the amount of BCM log data as follows, according to the log output destination.
For details about the ISPF log, see the Hitachi Business Continuity Manager User Guide.
The following table shows the amount of data when BCM logs are output without the system logger service being used (when LOGPUT=SAM).
Type of BCM log data |
Size#1 |
Items per command |
|---|---|---|
Messages (excluding those output from the ISPF panel, or scripts) |
100 + message-length#2 |
number-of-messages-output |
parameter information for the channel command words of the I/O, only when an I/O error occurs |
100 + CCW-length#3 |
number-of-times-an-I/O-error-occurred |
I/O return information, only when an I/O error occurs |
256 |
number-of-times-an-I/O-error-occurred |
Sense byte information, only when an I/O error occurs |
256 |
number-of-times-an-I/O-error-occurred |
Timestamps |
128 |
2 |
Command parameter information |
256 |
1 |
I/O response times |
139 |
1 |
#1: BCM logs are output with a specified value of this size, rounded up by a factor of 32.
#2: The maximum message length is 256 bytes.
#3: This is 2,051 bytes when the copy pair status is obtained, and 256 bytes or less otherwise.
When the system logger service is used
The following table shows the amount of log data output when the system logger service is used for BCM log output (for LOGPUT=LOGR).
|
Type of BCM log data |
Size#1 |
Items per command |
|---|---|---|
|
Messages (excluding those output from the ISPF panel, or scripts) |
68 + message-length#2 |
number-of-messages-output |
|
parameter information for the channel command words of the I/O, only when an I/O error occurs |
68 + CCW-length#3 |
number-of-times-an-I/O-error-occurred |
|
I/O return information, only when an I/O error occurs |
224 |
number-of-times-an-I/O-error-occurred |
|
Sense byte information, only when an I/O error occurs |
224 |
number-of-times-an-I/O-error-occurred |
|
Timestamps |
96 |
2 |
|
Command parameter information |
224 |
1 |
|
I/O response times |
107 |
1 |
#1: BCM logs are output with a specified value of this size, rounded up by a factor of 32.
#2: The maximum message length is 256 bytes.
#3: This is 2,051 bytes when the copy pair status is obtained, and 256 bytes or less otherwise.
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For staging datasets:
Estimate the disk capacity based on the amount of BCM log data.
-
For log stream datasets:
Estimate the disk capacity based on the save period, and the amount of BCM log data after offload.
-
For external datasets (OUTLOG):
Estimate the disk capacity based on the save period, and the amount of Business Continuity Manager log data after offload. For details about the format for external datasets (OUTLOG), see the Hitachi Business Continuity Manager User Guide.