Hitachi G1000 - Number of I;Os to the Port to be Added to Performance Monitor

Table 2-17 Relation between amount of I/O added to Performance Monitor and amount
of server I/O
GAD status Number of writes Number of reads
Mirrored Approximately the same* as the number
of writes to the P-VOL or S-VOL
The same as the total number of writes
to the P-VOL and S-VOL
Mirroring The same as the number of writes to the
P-VOL
The same as the number of reads from
the P-VOL
Suspended (P-VOL
has latest data)
The same as the number of writes to the
P-VOL
The same as the number of reads from
the P-VOL
Suspended (S-VOL
has latest data)
The same as the number of writes to the
S-VOL
The same as the number of reads from
the S-VOL
Blocked Not counted 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
destinatio
n volume
I/O mode
I/O
destinatio
n volume
Primary system Secondary system
Target
port
Initiator
port
RCU
Target
port
Target
port
Initiator
port
RCU
Target
port
Mirror (RL) P-VOL Total writes
and reads
Number of
writes
Not added Not added Not added Number of
writes
S-VOL Not added Not added Number of
writes
Total writes
and reads
Number of
writes
Not added
Local P-VOL Total writes
and reads
Not added Not added Not added Not added Not added
S-VOL Not added Not added Not added Total writes
and reads
Not added Not added
Block P-VOL Total writes
and reads*
Not added Not added Not added Not added Not added
S-VOL Not added Not added Not added Total writes
and reads*
Not added Not added
* 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
System requirements
2-21
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide