---
title: "Chapter 5: Storage Tiering, Lifecycle Governance & EBS Rightsizing — Cloud Economics | TinyCTO"
description: "Object storage lifecycle cascades, S3 Intelligent-Tiering, incomplete multipart abort, and EBS gp2 to gp3 online migration."
image: "https://tinycto.tv/assets/cloud-economics/cloud_economics_manuals_og.jpg"
canonicalUrl: "https://tinycto.tv/cloud-economics/manuals/05-storage-tiering-lifecycle"
locale: "en"
---

# Chapter 5: Storage Tiering, Lifecycle Governance & EBS Rightsizing

## 1. Executive Summary & Problem Statement
Storage costs are insidious because storage is an **accumulative asset**. Unlike compute, which drops to zero when turned off, unmanaged object storage and unattached block storage volumes continue billing 24/7/365 indefinitely.

Engineering teams routinely commit three major storage blunders:
1. Leaving petabytes of old operational logs in Standard S3 storage indefinitely (\$0.023/GB/month).
2. Leaving provisioned IOPS on EBS gp2 volumes instead of modern gp3 volumes (paying 20% higher base rates).
3. Ignoring abandoned incomplete multipart uploads that invisibly accumulate millions of billable storage chunks.

---

## 2. Object Storage Lifecycle Rules & S3 Intelligent-Tiering
Automated lifecycle rules transition data to lower-cost tiers based on access age:

```
[Day 0]       S3 Standard ($0.023/GB)            ──> Active access
[Day 30]      S3 Standard-Infrequent Access ($0.0125/GB) ──> Infrequent lookups
[Day 90]      S3 Glacier Flexible Retrieval ($0.0036/GB)  ──> Compliance archive
[Day 365]     S3 Glacier Deep Archive ($0.00099/GB)       ──> Statutory retention
[Day 2555]    Permanent Deletion (7 Years)
```

### Terraform S3 Lifecycle & Multipart Abort Policy
```hcl
resource "aws_s3_bucket_lifecycle_configuration" "finops_tiering" {
  bucket = aws_s3_bucket.data_lake.id

  rule {
    id     = "abort-incomplete-multipart-uploads"
    status = "Enabled"

    abort_incomplete_multipart_upload {
      days_after_initiation = 7
    }
  }

  rule {
    id     = "intelligent-tiering-and-archive"
    status = "Enabled"

    transition {
      days          = 30
      storage_class = "INTELLIGENT_TIERING"
    }

    transition {
      days          = 90
      storage_class = "GLACIER"
    }

    expiration {
      days = 2555 # 7-year regulatory retention
    }
  }
}
```

---

## 3. EBS Block Storage: Migrating gp2 to gp3
AWS gp3 volumes provide 3,000 IOPS and 125 MB/s baseline throughput regardless of volume size, at a **20% lower storage cost** ($0.08/GB vs $0.10/GB for gp2).

Migrating online without downtime using the AWS CLI:
```bash
# Query all gp2 volumes in the current region
aws ec2 describe-volumes \
  --filters Name=volume-type,Values=gp2 \
  --query "Volumes[*].VolumeId" --output text | tr '\t' '\n' | while read vol; do
    echo "Modifying volume $vol to gp3..."
    aws ec2 modify-volume --volume-id "$vol" --volume-type gp3
done
```

---

## 4. Unattached EBS Volume Sweeper
Unattached EBS volumes are pure waste. A nightly serverless cron job audits volume attachment status:
```bash
# Detect unattached (available) EBS volumes
aws ec2 describe-volumes \
  --filters Name=status,Values=available \
  --query "Volumes[*].[VolumeId,Size,CreateTime]" --output table
```
Volumes in `available` state for $> 14$ days should be snapshotted and purged.

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