# Hardware and Storage

Published articles for Hardware and Storage.

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## Replication Lag on AWS FSx: The Hidden EC2 Single-Flow Bandwidth Limit

DevFeed: [Replication Lag on AWS FSx: The Hidden EC2 Single-Flow Bandwidth Limit](<https://devfeed.tech/articles/replication-lag-on-aws-fsx-the-hidden-ec2-single-flow-bandwidth-limit-14112.md>)

Original publisher: [Read original article](<https://www.percona.com/blog/replication-lag-on-aws-fsx-the-hidden-ec2-single-flow-bandwidth-limit/>)

Author: Pablo Svampa

Published: 2026-08-25T21:00:16Z

Content type: article

Language: en

Sources: [Blog - Percona](<https://devfeed.tech/sources/blog-percona.md>)

Topics: [Amazon Web Services](<https://devfeed.tech/topics/aws.md>), [PostgreSQL](<https://devfeed.tech/topics/postgresql.md>), [Amazon EC2](<https://devfeed.tech/topics/amazon-ec2.md>), [Replication](<https://devfeed.tech/topics/replication.md>), [cloud-infrastructure](<https://devfeed.tech/topics/cloud-infrastructure.md>), [Network](<https://devfeed.tech/topics/network.md>), [Monitoring](<https://devfeed.tech/topics/monitoring.md>)

Tags: [aws](<https://devfeed.tech/tags/aws.md>), [database](<https://devfeed.tech/tags/database.md>), [ec2](<https://devfeed.tech/tags/ec2.md>), [hardware-and-storage](<https://devfeed.tech/tags/hardware-and-storage.md>), [insight-for-dbas](<https://devfeed.tech/tags/insight-for-dbas.md>), [monitoring](<https://devfeed.tech/tags/monitoring.md>), [network](<https://devfeed.tech/tags/network.md>), [postgresql](<https://devfeed.tech/tags/postgresql.md>), [replication](<https://devfeed.tech/tags/replication.md>), [storage](<https://devfeed.tech/tags/storage.md>)

### AI overview

This Percona case study examines PostgreSQL replication lag on an EC2 instance using Amazon FSx over NFS. Although AWS reported healthy storage with substantial provisioned capacity remaining, vmstat showed persistent I/O blocking and wait, indicating a bottleneck somewhere across the storage and network path, including an EC2 single-flow bandwidth limit.

### Source excerpt

A recent case in our Percona Support team started with a familiar complaint. A PostgreSQL standby lagging behind its primary. Although the problem was simple, it brought a specific flavor that's worth sharing. The customer had already reached out to AWS Support about the storage layer behind the database, an Amazon FSx filesystem mounted over ... Continued The post Replication Lag on AWS FSx: The Hidden EC2 Single-Flow Bandwidth Limit appeared first on Percona.