Snapshot Step by Step
• Quiesce the processing to create a
synchronization point for snapshot to occur
•Flushbuffers, force any write completions
• Take the Snapshot to form a stable image at the
known point-in-time
• Release applications to resume normal
processing
• Backup the snapshot
Data Protection with Storage Networks SNIA Tutorial
Quiesce the application
⎯ this just means temporarily suspend. So you will suspend any new I/O
from starting. Next we
Flush the application buffers.
⎯ this forces any writes to complete. Because if the write hasn’t completed
we will get an inconsistent copy of data. Once the flush has been
performed all of the data on our storage area will be correct. Then we
can take our
Snapshot or Split the Mirror
⎯ now the application can be released and carry on working because we
now have our point in time copy.