Information to know before setting wait time

ShadowImage User Guide

Version
9.8.5
Audience
anonymous
Part Number
MK-98RD9021-15

You should know that you can set the amount of time the host I/O priority mode option waits before the copy processing for SI fails. Set the wait time until the copy processing fails so that the time becomes shorter than the timeout time of host I/O. Note that, if you set a time that is extremely short, copy processing might fail even due to a temporary overload. If, for example, the timeout time of host I/O is 60 seconds or more, set the wait time until the copy processing fails to about 30 seconds.

System option Time until the copy processing fails (seconds)
HOST I/O priority mode 1 (9) 1
HOST I/O priority mode 2 (10) 2
HOST I/O priority mode 3 (11) 4
HOST I/O priority mode 4 (12) 8
HOST I/O priority mode 5 (13) 16

Set the wait time until the copy processing fails by combining system options HOST I/O priority mode 1 (9) to HOST I/O priority mode 5 (13). For example, if you enable HOST I/O priority mode 4 (12) and HOST I/O priority mode 5 (13), the wait time until the copy processing fails becomes 24 seconds.

These system options can be used with the following DCKMAIN versions:

VSP 5000 series

  • DCKMAIN 90-08-42 or later
  • DCKMAIN 90-08-24 to 90-08-40
  • DCKMAIN 90-08-05 to 90-08-20
  • DCKMAIN 90-07-05 to 90-08-00

VSP E series

  • DCKMAIN 93-06-42 or later
  • DCKMAIN 93-06-24 to 93-06-40
  • DCKMAIN 93-06-04 to 93-06-20
  • DCKMAIN 93-05-07 to 93-05-20

The time until the copy processing fails differs depending on the configuration as follows:

  • When ShadowImage works alone, the available setting rage of the time is 1 to 31 seconds.
  • When the P-VOL of ShadowImage works with other software:
    Configuration Available setting range of the time until copy processing fails (seconds)
    Working with the P-VOL of other software1 1 to 31
    Working with the S-VOL of other software1, or working with both the P-VOL and S-VOL of other software1 Performing host I/O on the P-VOL of ShadowImage 1 to 31
    Performing host I/O on the P-VOL of other software1, 2 1 to 14
    Note:
    1. Only TrueCopy, Universal Replicator, and global-active device apply. For other software, the configuration is regarded as the same as when ShadowImage works alone.
    2. The function of these options is disabled when host I/O is performed on the P-VOL of Universal Replicator.