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Using Schedules for Remote Data Protection Pack
additional snapshots may be retained by the
system at any given time. These two additional
snapshots include the snapshot that is in the
process of being copied, and the last fully
synchronized snapshot. A fully synchronized
snapshot is one that has completed copying so
that the remote snapshot is a complete mirror of
its corresponding primary snapshot.
Up to two additional snapshots may be retained
by the system at any given time.
Because the system will never delete the last fully
synchronized primary snapshot, a remote copy
schedule may retain N+2 copies for a retention
policy of N (the currently copying remote snapshot
plus the last fully synchronized snapshot). Using
the example above, if you have a retention policy
for your remote copy schedule of 2 primary and 5
remote snapshots, the system may retain up to 4
primary and 7 remote snapshots for a period of
time.
Table 1.4. Snapshot retention policy and maximum number of
snapshots retained in system
Remote Schedule
Retention Policy
Maximum Number of
Snapshots Retained
n of primary snapshots
x of remote snapshots
n + 2 primary snapshots
x + 2 remote snapshots
n of hours for primary snapshots
x of hours for remote snapshots
n + 2 primary snapshots older than n
x + 2 remote snapshots older than xx
n of days for primary snapshots
x of days for remote snapshots
n + 2 primary snapshots older than n
x + 2 remote snapshots older than xx
n of weeks for primary snapshots
x of weeks for remote snapshots
n + 2 primary snapshots older than n
x + 2 remote snapshots older than xx
Understanding Remote Data Protection Pack 11