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Adequate network bandwidth between pools.
•
Free space in each pool to accommodate the volume and snapshot reserve for the volume.
•
You cannot enable SyncRep on a volume for which traditional replication is configured, and
you cannot enable traditional replication on a volume for which SyncRep is configured. See
the "Disabling Replication" topic in the online help for instructions on disabling traditional
replication on a volume.
•
You cannot enable SyncRep on a volume that is bound to a group member.
6.2.6
How SyncRep protects volume availability
In normal SyncRep operation, in which the volume is in sync, the pools containing the SyncActive and
SyncAlternate volumes contain identical data. Volume writes are accepted as shown in Fig 15.
Figure 15 SyncRep
1.
The iSCSI initiator sends a write to the group.
2. Data is simultaneously written to both the SyncActive and SyncAlternate volumes.
3. The SyncActive and SyncAlternate volumes confirm to the group that the writes are complete.
4. The write is confirmed to the iSCSI initiator.
6.2.7
SyncAlternate volume unavailable
If the group can write to the SyncActive volume, but can no longer write to the SyncAlternate, initiator
access to the volume continues without disruption, as shown in Figure 16.
March 2013
Dell EqualLogic Configuration Guide v14.1
6-51
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