UhClem

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About UhClem

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  1. I've looked into "staggered spinup" for a DIY DAS. The key search term you want to research is "disk PUIS" ... Power Up In Standby. It looks a little tricky, but quite doable. (That isn't a solution for me because my drives are connected via a SAS expander.) [I don't use Unraid.]
  2. Before recommending a seller, I'd like to make sure we are seeking the best solution. Based on your system specs (mobo/cpu), you actually have 5 PCIe g3 x8 slots -- OR only 3 slots if one (or two) need to supply x16 lanes (each). If it is the latter case (you need to "free up" an x16 slot, then I'd suggest considering a SAS(/SATA) expander, which can use one of the soon-to-be x0 slots (expanders only use a PCIe slot for power (no signals/lanes) and a place to live). If it's the former case (you want to repurpose an x8 slot now used by an H200, then, yes, probably a 16 (
  3. Thanks! Good points. I think that spec'd endurance (e.g., 600 TBW for 860 EVO 1TB) won't be an issue, for all but extreme use cases. (For a data point, I used a 860 EVO 500GB in a DVR (DirecTV HR24) for the last year. It had ~8000 hours and ~30 TBW when I secure-erased it. Sadly, I didn't think to do any write-performance tests before the erase.) An "extreme use case" might be an array for multi HD security cameras [e.g. 4 feeds @ 10GB/hr each (24/7) =~ 350 TBW/year]. Note, though, that you need a near-server-level NVME to exceed 1 PBW rating (for 1 TB device). As you said, t
  4. A question, please ... [I might be missing something, since I don't use Unraid.] : For an all-SSD array, wouldn't turbo-mode alleviate the parity-dominating aspect (with no detrimental side-effects)? ["good" SSDs (sata), and in decent "trim", will get write speeds very close to their read speeds, no?]
  5. 520-byte format Although this is more common on SAS drives, it is still a possibility on SATA drives. Beyond explicit disclosure by the re-seller, it could be indicated in a Model #. In many cases, but not all, there are tools available to re-format such drives. (It is not a common issue ... so ... just a heads-up)
  6. Yes. And, it is a drag to have to "re-buy" (different) cables. But, if it helps to rationalize/justify going with the 71605, note that you might get some added flexibility and/or future-proofing. The 71605 is a low-profile card (be sure to get the bracket you want/need); and it is PCIe Gen3, so it would likely suffice if you only gave it 4 (g3) lanes (=~ 12x275).
  7. Maybe the answer is "staring you in the face". See (currently) 3 threads below this one, same sub-forum. (LSI is not the only game in town ...)
  8. [ Assuming that: also means using a separate 8088 input connector [else there's a tiny chance that the (single?) 8088-IN is flaky] ] Then, I suspect that you might have a glitchy H810 controller. In either case, if you have a 8088=>4xSata breakout cable, you could "test" the H810 independent of the MD1200.
  9. "Was that nine chips, or only eight? In all this excitement ..." -- Dirty Harry 😀
  10. Check locally for the Adaptec ASR-71605. PCIe 3.0 x8 6G SAS/SATA 16-port. Supported by Unraid. Handles throughput of at minimum 4500 MB/s (8 x 560 SSDs), and very likely ~6000. Found one on ebay.de for ~60eu. Link
  11. Sort of ... it shouldn't be used for one of the six array drives, since that would further divide the 650-700. But, it could/should be used for the cache drive; then it could only (slightly) impact mover operations, and only if TurboWrite was enabled. The (2-port?) add-in card would connect array drives 5 and 6. A "full-spec" PCIe x1 Gen2 card (e.g. ASM1061-based) , giving ~350 MB/sec, would not lower the "ceiling" of ~160 (for 4) on the mobo SATA. The only improvement would be that the cache SSD could operate at full (SataIII [~550]) speed, but that is moot, since, as your cach
  12. No limitation! -- for at least another decade (Since you mentioned that you'd be running 6 newer (ie, faster) array drives,) The SATA controller in the N40L (and 36L + 54L) has a maximum (combined) throughput limitation of ~650 MB/sec. With 4 array drives on the built-in SATAs (and 2 on the add-in), that would limit your "parallel" operations (parity-check, rebuild, Turbo-write) to 160 MB/sec, but many/most newer drives are capable of 200-250 MB/sec max (130-150 min). To maximize your array performance, you'd want to be very selective in your choice of add-in SATA card.
  13. Congratulations! (And, what do you mean "almost"? [such a bargain, too.])
  14. How about this: [from your 800k syslog] lines 759-763 Mar 11 07:50:54 Tower kernel: ahci 0000:04:00.0: SSS flag set, parallel bus scan disabled Mar 11 07:50:54 Tower kernel: ahci 0000:04:00.0: AHCI 0001.0200 32 slots 2 ports 6 Gbps 0x3 impl SATA mode Mar 11 07:50:54 Tower kernel: ahci 0000:04:00.0: flags: 64bit ncq sntf stag led clo pmp pio slum part ccc sxs Mar 11 07:50:54 Tower kernel: scsi host7: ahci Mar 11 07:50:54 Tower kernel: scsi host8: ahci Then searching for 0000:04:00 leads to: [line 373] Mar 11 07:50:54 Tower kernel: pci 0000:04:00.0: [1b21:0612] type 00 class 0x0
  15. Ultra320 SCSI is 320 MB/sec ... 12 drives ... even w/ 2 ports running is ~50 MB/sec per drive [if it can really share its bandwidth reasonably] --"Patience is a virtue."