Suspend Types - HP XP P9500 User Manual

Table 26 Pair status descriptions
Status
Simplex
Pending Duplex
Duplex
Suspended
(see "Suspend
types" (page 62))
Suspended
(see "Suspend
types" (page 62))

Suspend types

This section discusses pairs that are suspended by the user (suspended-delete pair to RCU), and
pairs that are suspended by the system (Suspended).
You can suspend a pair when the initial copy operation is complete.
◦ You must suspend a pair must be to perform ICKDSF maintenance on the M-VOL or to
access the R-VOL (read-only mode). Continuous Access Synchronous Z pairs are also
suspended when the CGROUP FREEZE/RUN command is processed.
◦ When you suspend a pair, the main system ensures synchronization by completing any
pending update copy operation according to the user specified drain/purge suspend
option before changing the status to Suspended.
Pairs are suspended by the main system only, for any of the following reasons:
The user released the pair from the remote system.
◦
◦ An error condition related to the remote system, the R-VOL, or an update-copy operation.
◦ When the remote system cannot execute DFW (DASD fast write) to the R-VOL (when the
PPRC DFW-to-R-VOL-Required option is specified).
The main system cannot communicate with the remote system.
◦
62 Monitoring and maintenance
Description
This volume is not currently assigned to a Continuous
Access Synchronous Z pair.
The initial copy operation for this pair is in progress.
This pair is not yet synchronized.
The pair is synchronized
Updates from the host to the M-VOL are
duplicated in the R-VOL.
The user has split the pair.
The pair is not synchronized.
When a pair is suspended from the main system,
that system changes the status of the M-VOL and
R-VOL to Suspended.
When a pair is suspended from the remote
system, the remote system changes the status of
the R-VOL to Suspended. The main system detects
this (if path status is normal) and changes M-VOL
status to Suspended.
When a pair is release from the remote system,
that system changes the R-VOL status to Simplex.
The main system detects this (if the path status is
normal) and changes the M-VOL status to
Suspended. The pair must be released from the
main system in order to change M-VOL status to
Simplex.
The main system has suspended the pair due to
an error condition.
The pair is not synchronized.
If the main system cannot keep the pair
synchronized for any reason, it changes the status
of the M-VOL and R-VOL (if possible) to
Suspended.
Access to M-VOL Access to R-VOL
Read/write Read/write
Read/write Read only
Read/write Read only
Read/write
Read only if
R-VOL write
option is
disabled.
Read/write if
R-VOL write
option is
enabled.
Read/write Read only
Read only if M-VOL
fence level is Data.