The number of I/Os (reads and writes) to GAD volumes that is added to Performance Monitor depends on the GAD status, as shown the following tables.
| GAD status | P-VOL | S-VOL |
|---|---|---|
| Mirrored |
The sum of the following values:
|
The sum of the following values:
|
| Quorum disk blocked or no quorum disk volume | Number of writes to the P-VOL |
The sum of the following values:
|
| Mirroring | Number of writes to the P-VOL | Number of RIOs to the S-VOL from the P-VOL |
| Suspended (when the P-VOL has the latest information) | Number of writes to the P-VOL | Not counted* |
| Suspended (when the S-VOL has the latest information) | Not counted* | Number of writes to the S-VOL |
| Blocked | Not counted* | Not counted* |
|
* Reads and writes by a server are illegal requests and cause an error. However, they could be counted as I/O. |
||
| GAD status | P-VOL | S-VOL |
|---|---|---|
| Mirrored | Number of reads from the P-VOL | Number of reads from the S-VOL |
| Quorum disk blocked or no quorum disk volume | Number of reads from the P-VOL | Number of reads from the S-VOL |
| Mirroring | Number of reads from the P-VOL | Not counted* |
| Suspended (when the P-VOL has the latest information) | Number of reads from the P-VOL | Not counted* |
| Suspended (when the S-VOL has the latest information) | Not counted* | Number of reads from the S-VOL |
| Blocked | Not counted* | Not counted* |
|
* Reads and writes from a server are illegal requests and cause an error. However, they could be counted as 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 reads from the P-VOL and S-VOL |
| Quorum disk blocked | The same as the number of writes to the P-VOL | The same as the number of reads from the P-VOL |
| Quorum disk blocked or no quorum disk volume | The same as the number of writes to the P-VOL | The same as the total number of reads from 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. |
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