MongoDB Shard & Oplog Sizer

Calculate sharding boundaries and prevent replication failure by sizing Oplogs correctly.

Target Dataset Size (TB)

Write Throughput (MB/s)

Target Oplog Window (Hours)

Max Storage per Shard (TB)

Min Shards

Oplog Size

8438 GB

⚠️ Massive Oplog required. Consider lowering the retention window or separating write-heavy workloads.

Cost per Shard Node

AWSBest

$1,082.80

GCP

$1,283.42

Azure

$1,417.05

CPU: 16 coresRAM: 64.0 GBStorage: 4775 GB

About MongoDB Sharding

Calculate WiredTiger cache size, shard thresholds, and IOPS requirements.

Accurate infrastructure sizing prevents unexpected cloud budget blowouts while guaranteeing SLA compliance and system reliability under peak traffic.