Gad Status And I/O Allowance By Access Attribute - Hitachi G1000 User Manual

• Server I/O can be controlled, depending on GAD status and the access
attribute.
• If you set the Data Retention Utility S-VOL Disable attribute on the GAD
S-VOL, GAD pair operations using CCI are restricted. Release the S-VOL
Disable attribute from the S-VOL, then perform CCI operations.
Related topics
• GAD status and I/O allowance by access attribute on page 2-18

GAD status and I/O allowance by access attribute

Even when the access attribute is assigned to a GAD volume, the initial copy
and pair resynchronization operations are not controlled. The following table
shows whether server I/O is allowed or not for the listed GAD status and
access attribute.
GAD statuses
Mirrored Read/Write
Read Only or
Protect
Read/Write
Read Only or
Protect
Mirroring Read/Write
Suspended (when
Read Only or
the I/O mode of
Protect
the primary volume
is Local and the I/O
Read/Write
mode of the
secondary volume
Read Only or
is Block)
Protect
Suspended (when Read/Write
the I/O mode of
Read Only or
the primary volume
Protect
is Block and the I/O
mode of the
Read/Write
secondary volume
is Local)
Read Only or
Protect
Block Read/Write
Read Only or
Protect
Read/Write
2-18
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
Access attribute
P-VOL S-VOL
Read/Write
Read/Write
Read Only or
Protect
Read Only or
Protect
Read/Write
Read/Write
Read Only or
Protect
Read Only or
Protect
Read/Write
Read/Write
Read Only or
Protect
Read Only or
Protect
Read/Write
Read/Write
Read Only or
Protect
System requirements
I/O
P-VOL
Ends normally Ends normally
Depends on the Ends normally
attribute*
Ends normally Depends on the
attribute*
Depends on the Depends on the
attribute* attribute*
Ends normally Rejected
Depends on the Rejected
attribute*
Ends normally Rejected
Depends on the Rejected
attribute*
Rejected Ends normally
Rejected Ends normally
Rejected Depends on the
attribute*
Rejected Depends on the
attribute*
Rejected Rejected
Rejected Rejected
Rejected Rejected
S-VOL