# NVMe Benchmark: Pre-Firmware Update (GXA7401Q)

> **Date**: 2026-04-02 10:35 CET
> **Device**: Samsung PM9A1 (MZVL2512HCJQ-00B00), 512GB
> **Serial**: S675NF0R703667
> **Firmware**: GXA7401Q (pre-update)
> **OS**: Manjaro Linux, kernel 6.12, KDE 6.5.6
> **NVMe slot**: /dev/nvme0n1 (root drive)

## SMART Health Data

| Metric | Value |
|--------|-------|
| Critical Warning | 0 (healthy) |
| Temperature | 51°C (Sensor 2: 64°C) |
| Available Spare | 100% |
| Available Spare Threshold | 10% |
| Percentage Used | 19% |
| Data Units Read | 17.97 TB |
| Data Units Written | 94.19 TB |
| Host Read Commands | 683,328,216 |
| Host Write Commands | 1,651,377,088 |
| Controller Busy Time | 9,265 min |
| Power Cycles | 884 |
| Power On Hours | 4,926 h (~205 days) |
| Unsafe Shutdowns | 88 |
| Media Errors | 0 |
| Error Log Entries | 0 |

## hdparm Results

| Test | Throughput |
|------|-----------|
| Cached Reads | 7,349.97 MB/sec |
| Buffered Disk Reads | 741.99 MB/sec |

## fio Benchmarks (4K block, libaio, iodepth=32, 30s per test)

### Sequential Read

| Metric | Value |
|--------|-------|
| Bandwidth | 1,554 MiB/s (1,630 MB/s) |
| IOPS | 398,000 |
| Avg Latency | 80.16 µs |
| P99 Latency | 128 µs |
| P99.9 Latency | 186 µs |

### Sequential Write

| Metric | Value |
|--------|-------|
| Bandwidth | 1,305 MiB/s (1,368 MB/s) |
| IOPS | 334,000 |
| Avg Latency | 95.53 µs |
| P99 Latency | 163 µs |
| P99.9 Latency | 255 µs |

### Random Read

| Metric | Value |
|--------|-------|
| Bandwidth | 1,409 MiB/s (1,477 MB/s) |
| IOPS | 361,000 |
| Avg Latency | 88.42 µs |
| P99 Latency | 141 µs |
| P99.9 Latency | 200 µs |

### Random Write

| Metric | Value |
|--------|-------|
| Bandwidth | 1,135 MiB/s (1,190 MB/s) |
| IOPS | 291,000 |
| Avg Latency | 109.78 µs |
| P99 Latency | 190 µs |
| P99.9 Latency | 334 µs |

### Random Read/Write (70/30)

| Metric | Read | Write |
|--------|------|-------|
| Bandwidth | 919 MiB/s (964 MB/s) | 394 MiB/s (413 MB/s) |
| IOPS | 235,000 | 101,000 |
| Avg Latency | 94.72 µs | 95.05 µs |
| P99 Latency | 149 µs | 149 µs |

## Test Configuration

```text
fio-3.41
Block size: 4096B
IO Engine: libaio
IO Depth: 32
Direct IO: yes
Runtime: 30s per test
File size: 1GiB
Directory: /tmp (on NVMe root drive)
```

## Assessment

- Drive health is good: 0 media errors, 0 error log entries, 100% spare
- 19% endurance used after ~205 days powered on (within normal range)
- Sequential performance consistent with PCIe 4.0 x4 NVMe expectations
- Random IOPS strong for a client-grade TLC SSD
- Temperature under load: 51-64°C (well within spec)

## Next Steps

- Apply firmware update to GXA7802Q
- Re-run identical benchmarks post-update
- Compare results in `docs/tech/nvme-benchmark-post-gxa7802q.md`