Raid6硬盘兼容性咨询及故障硬盘替换选型问题

Hey Steve, sorry to hear your RAID6 has dropped into degraded mode after 65k+ hours of runtime—your archive setup has definitely earned its keep! Let’s walk through your replacement options to make sure you pick a compatible, reliable drive.

First, let’s address the core compatibility question: the ST6000NM019B 6TB Exos drive is absolutely a viable replacement for your failed ST5000NM0024-1HT, and here’s why:

• Interface Compatibility: Your Silicon Image SiI 3132 is a SATA II controller, but modern SATA III drives (like the Exos 6TB) are fully backward-compatible with SATA II interfaces. The controller will just run the new drive at SATA II speeds, which is totally fine for an archive NAS with minimal workload.
• Capacity Requirements: For RAID6, the replacement drive only needs to have a capacity at least as large as the failed drive’s usable capacity. Your original 5TB drive’s usable space is what the RAID array is built around, so the 6TB drive will work perfectly—the controller will only utilize the first 5TB during the resilver process, and the remaining 1TB will sit unused (you can leverage this extra space later if you ever replace all drives with 6TB models and expand the array).
• Lineage & Reliability: Both the original ST5000NM0024 and the ST6000NM019B are Seagate Exos (formerly Constellation) enterprise-grade drives, which are designed for 24/7 operation and long-term archival use. This matches your NAS’s workload perfectly, so you won’t be sacrificing reliability by switching to this model.

A few extra tips to make the replacement go smoothly:

• Double-check that your NDL-2810R’s drive bays support 3.5-inch enterprise drives (they almost certainly do, since it’s an 8-bay NAS designed for this type of hardware).
• Before swapping the drive, if at all possible, back up your most critical small files to an external drive. RAID6 has double redundancy, but resilvering is a high-stakes operation—better safe than sorry, especially with your array being 90% full.
• During the resilvering process, avoid putting any extra load on the NAS (no large file transfers, no intensive scans). Let it focus on rebuilding the array to minimize the risk of issues.
• If you ever want to use that extra 1TB of space later, you can replace each drive in the array one by one with 6TB models (waiting for each resilver to finish before swapping the next), then expand your Btrfs filesystem to utilize the full capacity.

Hope this helps—you’ve got this, and that Exos drive should get your archive back to full health in no time!

备注：内容来源于stack exchange，提问作者cz.steve