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RAID Calculator
1. Disks configuration
Configured disks (0 disks) :
2. RAID Level
3. Performance & Hardware Settings (Optional)
Calculation Results
4. TCO Calculator (Total Cost of Ownership over 5 years)
Everything You Need to Know About Hardware & Traditional RAID Calculations
Choosing the optimal storage configuration is critical for balancing data safety, disk performance, and budget. Whether you are deploying a enterprise DAS/SAN storage array, configuring a hardware RAID controller (LSI, MegaRAID, Perc), or setting up a Linux MDADM array, our RAID Calculator predicts your exact net usable capacity after accounting for parity overhead, formatting loss, and dedicated hot spares.
Why Use a Hardware RAID Calculator?
Traditional hardware and software RAID levels manage data redundancy across physical disk drives using striping, mirroring, and parity blocks. Understanding the key trade-offs between standard RAID levels is essential before array initialization:
RAID 0 :Combines all drives for maximum performance and 100% capacity efficiency, but offers zero fault tolerance. A single drive failure results in total data loss.
RAID 1 (Mirroring):</strong> Duplicates data across paired drives for high fault tolerance and fast read speeds, incurring a 50% capacity loss.
RAID 5 (Single Parity): Distributes parity across all disks. Tolerates a single drive failure while balancing cost and capacity (requires a minimum of 3 drives).
RAID 6 (Double Parity):Uses dual distributed parity blocks to survive up to two simultaneous drive failures. Essential for high-capacity SAS/SATA HDD arrays during rebuild cycles.
RAID 10 (1+0 Striped Mirrors): Combines the performance of RAID 0 with the redundancy of RAID 1. Ideal for I/O-intensive database servers and mission-critical enterprise environments.
Array Performance, IOPS, and Write Penalties
Raw storage space is only half the equation. Parity-based RAID configurations introduce a write penalty (e.g., 4 I/O operations per write on RAID 5, and 6 I/O operations on RAID 6). Our calculator automatically estimates total read/write throughput, array IOPS, and hardware controller overhead to help you prevent storage bottlenecks under peak workloads.
Why Use a Dedicated RAID Performance Calculator for Your Server?
Calculating usable storage on hardware controllers isn’t as simple as multiplying disk size by drive count. Binary vs. decimal conversions (TiB vs. TB), filesystem formatting reserves, controller overhead, and hot-spare assignments directly reduce your array’s real net storage.
Our online RAID Calculator simulates drive combinations, models controller throughput limits, and computes expected IOPS for both HDD and SSD configurations—ensuring you build a cost-effective, high-reliability storage server.
Optimize Your Server Performance with Our Free Admin Tools
Maximizing array uptime and disk performance requires continuous benchmark analysis and rebuild risk assessment. Explore our suite of specialized utilities designed for systems engineers and hardware admins:
<a href=”https://raidzfscalculator.com/fio-results-viewer/” target=”_blank” rel=”noopener” title=”FIO Benchmark Log Visualizer”>FIO Benchmark Visualizer</a>:</strong> Transform complex JSON output logs from <code>fio</code> performance benchmarks into interactive charts tracking IOPS, throughput (MB/s), and latency under multi-threaded stress tests.
<a href=”https://raidzfscalculator.com/rebuild-time-calculator/” target=”_blank” rel=”noopener” title=”RAID Array Rebuild Time Estimator”>RAID Rebuild Time Estimator</a>:</strong> Calculate how long your RAID controller will take to rebuild a degraded array after a drive swap, helping you evaluate secondary drive failure risks during rebuilding.
<a href=”https://raidzfscalculator.com/bottleneck-analyzer/” target=”_blank” rel=”noopener” title=”Hardware Bottleneck Calculator”>PC & Server Bottleneck Calculator</a>:</strong> Identify if your PCIe bus bandwidth, RAID controller cache, or CPU speed is bottlenecking your overall storage system throughput.
Hardware & Enterprise RAID Calculator
Accurately size hardware RAID controllers, Linux MDADM arrays, and NAS enclosures. Model net formatted capacity, write penalties, array IOPS, hot spare configurations, and 5-year Total Cost of Ownership (TCO).
Why Use Our Hardware RAID Calculator?
Enterprise Controller Precision
Standard drive capacities do not translate 1:1 into usable storage. Our calculator factors in hardware controller overhead, binary-to-decimal conversion (TB to TiB), parity calculations, and filesystem formatting reserves.
IOPS & Write Penalty Modeling
Parity-based arrays (RAID 5 & RAID 6) create significant write penalties (4x and 6x I/O operations per write). Predict actual random workload throughput before deploying storage nodes.
5-Year TCO & Energy Sizing
Estimate long-term storage investment. Compute initial disk and controller acquisition costs alongside active operational costs like power consumption (Watts), cooling, and spare replacement.
Engineered for System Admins & Integrators
Flexible Array Topologies
Configure drive groups, dedicated global hot spares, and custom read/write ratios tailored to your specific application requirements.
Multi-Drive Mix & Sizing
Simulate drive capacity boundaries across enterprise SAS HDDs, NVMe SSDs, and SATA drives to avoid mismatched capacity waste.
Automated Validation Checks
Built-in logic prevents impossible configurations (such as RAID 5 with less than 3 drives or RAID 6 with less than 4 drives).
Mobile-Friendly Interface
Designed for quick on-site calculations on smartphones, tablets, or desktop web browsers without plug-ins or logins.
Instant Benchmark Estimation
View real-time estimates for total array read/write throughput (MB/s) and random read/write IOPS directly during editing.
Enterprise Workload Profiles
Presets optimized for virtualized environments, transactional SQL databases, CCTV video surveillance, and cold backup archives.
This calculator provides conservative estimates based on standard storage mathematics and typical hardware controller behavior. Actual operational throughput and storage utilization may vary depending on:
- RAID Controller Cache size, Battery Backed Write Cache (FBWC), and queue depth.
- Hardware vs. Software RAID implementation (e.g., LSI MegaRAID vs. Linux MDADM).
- System bus interface limits (PCIe bus generation and lane count).
- Filesystem overhead (NTFS, EXT4, XFS sector alignment and metadata allocation).
- Workload profile (sequential vs. small block 4K random I/O).
Recommendation: Use these calculated metrics as a baseline for hardware procurement, then validate performance under real workloads using tools like fio or Iometer.
Typical Use Cases
IT Infrastructure Integrators
Rapidly design storage proposals for clients. Present clear, line-by-line total cost of ownership estimates and technical justifications for hardware RAID level choices.
Storage & Systems Consultants
Evaluate capacity trade-offs, drive failure fault tolerance, and IOPS overhead when auditing existing SAN/DAS setups or planning server migrations.