[DOCS-2395] Backup FAQ - Initial Sync load Created: 11/Dec/13  Updated: 11/Jan/17  Resolved: 13/Jan/14

Status: Closed
Project: Documentation
Component/s: None
Affects Version/s: None
Fix Version/s: 01112017-cleanup

Type: Task Priority: Major - P3
Reporter: Meghan Gill Assignee: Tim Slavin
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Participants:
Days since reply: 10 years, 10 weeks ago

 Description   

can we add a question along the lines of:
What is the load on the database during the initial sync?



 Comments   
Comment by Steve Briskin (Inactive) [ 11/Dec/13 ]

The impact on the DB should be similar, if not identical, to syncing a new secondary.

The backup agent scans every Collection in every Collection (minus any blacklisted namespaces that they configured). Data is read in $natural order, so I/O should be sequential. From an impact perspective I expect I/O reads to spike, data to get evicted from the working set, and outgoing bandwidth to spike.
There is no throttling in the agent, it consumes data from the DB as fast as it can deserialize, compress, and push data to BRS.

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