Server I/O when the GAD status is Suspended

Ops Center High Availability User Guide

Version
10.9.x
File Size
3.9 MB
Audience
anonymous
Part Number
MK-99ADM003-14

When the GAD status is Suspended, the I/O mode differs depending on where the latest data is.

When the GAD status is Suspended and the latest data is on the P-VOL, the I/O mode is as follows:

  • P-VOL: Local
  • S-VOL: Block

When the latest data is on the S-VOL, the I/O mode is as follows:

  • P-VOL: Block
  • S-VOL: Local

When the latest data is on the P-VOL, write requests are written to the P-VOL, and then the write-completed response is returned to the host, as shown in the following figure. The S-VOL's I/O mode is Block, so it does not accept I/O from the server, and the P-VOL's I/O mode is Local, so the data written to the P-VOL is not written to the S-VOL.



Read requests are read by the P-VOL and then sent to the host. There is no communication between the primary and secondary storage systems.