What is SnapMirror ? What are Sync, Semi Sync and Async modes of SnapMirror ?
NetApp SnapMirror software combines disaster recovery and data distribution in a streamlined solution that supports today's global enterprises. SnapMirror is a very cost-effective solution with efficient storage and network bandwidth utilization and provides additional value by enabling you to put the DR site to active business use.
SnapMirror replicates data from a source volume or qtree to a partner destination volume or qtree, respectively, by using Snapshot copies. Before using SnapMirror to copy data, you need to establish a relationship between the source and the destination and Updates the destination to reflect incremental changes on the source, as per the schedule you specify.
The result of this process is an online, read-only volume or qtree that contains the same data as the source at the time of the most recent update.
What are three modes of SnapMirror :
Sync: Replicates writes from a source volume to a secondary volume at the same time it is written to the source volume. Snap mirror Sync is used in environments that have zero tolerance (ZERO RPO) for data loss.
Semi-Sync: It is between the Async and sync mode with less impact on performance. It can configure a snapMirror sync replication to lag behind the source volume by a user-defined number of write operations or milliseconds. ( Data loss can not be more than 10 seconds :) , Why ? I will explain in my next post - Mechanism behind Semi- Sync, stay tuned)
Async: Replicates snapshot copies from a source volume or qtree to a destination volume or qtree. Incremental updates are based on schedules or are performed manually using the snapmirror update command. It works both in volume level and qtree level.
NetApp SnapMirror software combines disaster recovery and data distribution in a streamlined solution that supports today's global enterprises. SnapMirror is a very cost-effective solution with efficient storage and network bandwidth utilization and provides additional value by enabling you to put the DR site to active business use.
SnapMirror replicates data from a source volume or qtree to a partner destination volume or qtree, respectively, by using Snapshot copies. Before using SnapMirror to copy data, you need to establish a relationship between the source and the destination and Updates the destination to reflect incremental changes on the source, as per the schedule you specify.
The result of this process is an online, read-only volume or qtree that contains the same data as the source at the time of the most recent update.
What are three modes of SnapMirror :
Sync: Replicates writes from a source volume to a secondary volume at the same time it is written to the source volume. Snap mirror Sync is used in environments that have zero tolerance (ZERO RPO) for data loss.
Semi-Sync: It is between the Async and sync mode with less impact on performance. It can configure a snapMirror sync replication to lag behind the source volume by a user-defined number of write operations or milliseconds. ( Data loss can not be more than 10 seconds :) , Why ? I will explain in my next post - Mechanism behind Semi- Sync, stay tuned)
Async: Replicates snapshot copies from a source volume or qtree to a destination volume or qtree. Incremental updates are based on schedules or are performed manually using the snapmirror update command. It works both in volume level and qtree level.
No comments:
Post a Comment