BSD Distributions & High-Security/Storage Networking
TrueNAS Core Administration
TrueNAS Core packages FreeBSD and ZFS into a managed storage appliance. Throughput depends on pool layout, network stack tuning, and the protocol in use. Most performance problems come from mismatched record sizes, undersized caches, or a single saturated link rather than from ZFS itself.
要点
- Design pools around workload IOPS and record size, not raw capacity alone.
- Use mirrors or appropriately sized RAIDZ vdevs based on resilience and performance needs.
- Tune MTU and checksum offload consistently across the entire network path.
- Benchmark SMB, NFS, and iSCSI separately, since each has different bottlenecks.
- Monitor ARC hit rate and adjust memory allocation against other services.
- Schedule scrubs and snapshots to avoid competing with peak workloads.
- Test failover and disk replacement procedures before a real failure.
- Keep configuration backups so the appliance can be rebuilt quickly.
常见问题
Is TrueNAS Core still supported?
It remains maintained, though the vendor's focus has shifted toward the Linux-based Scale product.
Why is my throughput lower than the link speed?
Protocol overhead, single-stream limits, disk layout, and client tuning usually explain the gap.
Should I use deduplication?
Only with enough memory and a clear benefit; it can severely hurt performance when misapplied.
How much RAM does ZFS need?
Enough for metadata and a useful ARC. There is no universal number, so measure your working set.
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