Number Of I/Os To The Port To Be Added To Performance Monitor - Hitachi G1000 User Manual

Table 2-17 Relation between amount of I/O added to Performance Monitor and amount
GAD status
Mirrored Approximately the same* as the number
of writes to the P-VOL or S-VOL
Mirroring The same as the number of writes to the
P-VOL
Suspended (P-VOL The same as the number of writes to the
has latest data) P-VOL
Suspended (S-VOL The same as the number of writes to the
has latest data) S-VOL
Blocked Not counted
* For writes by a server, RIOs might be divided before being issued. For this reason, this number might
differ from the number of writes by a server.

Number of I/Os to the port to be added to Performance Monitor

The number of I/Os (reads or writes) of the port added to Performance
Monitor depends on the P-VOL or S-VOL (I/O destination), or on the I/O
mode of the destination volume, as shown in the following table.
I/O
I/O
destinatio
destinatio
n volume
n volume
I/O mode
Mirror (RL) P-VOL
S-VOL
Local P-VOL
S-VOL
Block P-VOL
S-VOL
* Reads and writes by a server are illegal requests and cause an error. However, they might be counted
as I/Os.
Related topics
• Performance Monitor on page 2-19
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
of server I/O
Number of writes
Primary system
Target Initiator
port port
Total writes Number of
and reads writes
Not added Not added
Total writes Not added
and reads
Not added Not added
Total writes Not added
and reads*
Not added Not added
System requirements
Number of reads
The same as the total number of writes
to the P-VOL and S-VOL
The same as the number of reads from
the P-VOL
The same as the number of reads from
the P-VOL
The same as the number of reads from
the S-VOL
Not counted
Secondary system
RCU
Target
Target
port
port
Not added Not added
Number of Total writes
writes and reads
Not added Not added
Not added Total writes
and reads
Not added Not added
Not added Total writes
and reads*
RCU
Initiator
Target
port
port
Not added Number of
writes
Number of Not added
writes
Not added Not added
Not added Not added
Not added Not added
Not added Not added
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