Data Replication Using SnapMirror16-5
When it is time to update the mirror, another snapshot is created on filerA. The
snap
list command on filerA generates the following display after /vol/vol1/filerB_vol2.2 is
created on filerA:
Volume vol1
working....
%/used %/total date name
-------- ---------- ------------ --------
0% ( 0%) 0% ( 0%) Nov 17 10:52 filerB_vol2.2 (busy)
0% ( 0%) 0% ( 0%) Nov 17 10:51 filerB_vol2.1
1% ( 0%) 0% ( 0%) Nov 17 10:00 hourly.0
1% ( 0%) 0% ( 0%) Nov 17 00:00 nightly.0
1% ( 0%) 0% ( 0%) Nov 15 16:00 hourly.1
1% ( 0%) 1% ( 0%) Nov 15 15:00 hourly.2
After filerB_vol2.2 is transferred from filerA to filerB, both the filerB_vol2.1 and
filerB_vol2.2 snapshots exist on filerB.
On filerA, however, filerB_vol2.1 is no longer needed and is deleted; only filerB_vol2.2
remains.
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The filer fails to replicate data if it cannot find the required snapshots in the source
and destination volumes. This section provides an example illustrating what happens
if you inadvertently delete a snapshot required for data replication.
In this example, data is replicated from /vol/vol1 of filerA to /vol/vol2 of filerB. Suppose
you use the snap delete command on filerA to delete the

filerB_vol2.2

snap-
shot. When filerB tried to update the mirror according to the schedule in the
snapmirror.conf file, it could not find the snapshot to determine what incremental
changes are required in the mirror.
As a result, filerB displays the following error message.
The source filer requires a complete transfer. The destination volume
is online and must be offline for a complete transfer.
FilerA displays the following error message:
Destination filerB could not accept a complete transfer.
These messages mean that filerB tries to create a baseline version of the mirror, but
doing so requires that the mirror on filerB be taken off-line.
To proceed, use the vol offline command to take the mirror off-line and reboot
the filer. At the next scheduled mirror update, the filer creates a baseline version of
the mirror.