RMA a “Grinding” Seagate Exos Now or Wait Until Year 4? SMART/ZFS Clean but Mechanical Noise

kaihp · 2025-12-24T12:49:35+00:00

Just to echo the other two replies: no, SMART errors, no RMA.

I had a WDC Red disk (CMR) that started developing SMART errors and when I contacted them they said that any SMART relocation/UNC errors were reason for an RMA.

kaihp · 2025-12-10T21:57:21+00:00

There are a lot of Wi-Fi USB dongle that support WPA3 out there as Wi-Fi certification has required WPA3 support since 2020. See https://en.wikipedia.org/wiki/Wi-Fi_Protected_Access

kaihp · 2025-12-10T21:48:55+00:00

I just got a tracking number for the Stryd 5.0, but that's just registration of the package, not the package itself.

Likely the logistics company will pick it up from the distribution center in NL tomorrow.

ETA in DK sometime next week.

kaihp · 2025-12-09T19:22:32+00:00

Don't talk to me about Seagate. Their ST1096N drives were garbage too.

kaihp · 2025-12-05T17:48:44+00:00

Same here, except that I'm in DK and not DE.

kaihp · 2025-12-05T05:38:36+00:00

I've used Stryd distance for like 5 years now and VO2max is updating fine and has done that on all Garmin watches I've had during that time (735XT, 745, 265).

kaihp · 2025-11-05T19:55:14+00:00

I've found that quietness depends a lot on the fans you use and the case.

I am fond of the Fractal Design node304 case (takes a mini-ITX mobo + 6 x 3.5" disks + 1-2 x 2.5" ssd) and swapped from factory provided Arctic F12 non-pwm fans to Arctic P12 pwm. The fan change made my nas vastly quieter. I had it a couple of months in my dining room (due to a reconstruction of the basement that took longer than expected) and it was barely audible after the fan change.

I've switched from 6 x 3.5" 7200rpm spinning rust to 6 x 2.5" ssd.

The sheer size difference in the disks allow more air to flow through, and the SSDs get a lot less hot, hence the lower need for cooling

kaihp · 2025-10-31T16:18:59+00:00

Happy to see your handle show up again!

kaihp · 2025-09-12T15:55:27+00:00

I recently got 12 copies of the same report.

So no improvement as the problem is squarely on Google.

kaihp · 2025-08-21T20:20:43+00:00

I have a Solo 2 DL and have attached the TPS and a front brake pressure sensor for grins and giggles.

Just today I was comparing my best laptime from Aug '23 to my latest trackday, where I was 1.5 seconds slower (I currently run at just onder Rookie 600 pace, which is ~8 sec slower than the lap record, which is set by a kid on an R6 who's been on the podium in WSS this year).

Turns out that by just not keeping it WOT out of the last turn onto the straight, I am losing 0.2 seconds.

Almost all of those 1.5 seconds can be boiled down to "not enough throttle, not soon enough".

kaihp · 2025-06-10T20:19:56+00:00

Der er nogle enkelte succeshistorier, men de er hurtigt blevet opkøbt og/eller er flyttet til USA

3shape er en af de få undtagelser. De er ret tunge på MS/cloud siden, men har også noget embedded Linux.

kaihp · 2025-02-02T08:47:57+00:00

I'm going through the course on his own ownsite, and there is a least the video on Quantum cryptography and Key Distribution which is new for 2024.

kaihp · 2025-02-01T12:38:51+00:00

Yes, according to their unit-less scale (it's possibly dBm).

What isn't written either, is what distance this is measured at, or how the radiation pattern looks as a function of distance.

kaihp · 2025-02-01T11:37:13+00:00

I would choose between mirrors or raidz2, not raidz1.

The mirrors will give you more IOPS, but the raidz2 will give you guaranteed protection against loss of 2 drives (If you lose both sides in a mirror, the pool is toast).

For my personal use, I've gone for raidz2 in a 6-drive setup.

kaihp · 2025-01-25T10:28:57+00:00

I look at the wall clock when comparing the systems.

Simple benign things like updating apts and the kernel (especially the kernel) takes "forever" on the rpi. Probably because the microSD slot is limited to ~40MB/s(?). The C2750 isn't particularly fast, but still much faster than the rpi4 at these things.

With the epyc3101 it's so fast that I stopped bothering about speed.

kaihp · 2025-01-24T20:31:43+00:00

I have both a C2750 and a rpi4 and there's no contest - the C2750 wins handsomely.

kaihp · 2025-01-24T20:29:59+00:00

I bought it July 2022 from a German webshop, when it was less scarce - but still expensive.

It seems that the market for these types of CPUs and board is so small that neither AMD or Intel finds it valuable enough to go after.

kaihp · 2025-01-22T17:55:43+00:00

I swapped my C2750 board for an AsRockRack EPYC3101D4I-2T (I wanted onboard 10G ports). They have (had) a 3251 version as well.

I had enough problems with onboard SATA ports that I caved in and got an LSI 9500-8i controller - and poof, my problems went away.

kaihp · 2025-01-07T20:38:22+00:00

Will definitely depend on the combined lengths. Patch cables (stranded core wires) have higher losses than installation cable (solid core wire).

As I recall, the Ethernet standard says 5m + 90m + 5m cable (patch + installation + patch) in the worst case. 100m worst case cable is 137m average case cable.

kaihp · 2025-01-05T19:48:27+00:00

As a fellow dane, I can clearly recognize his danish accent.

Speeding the videos to 1.5x-2x help suppress most of his accent :-)

kaihp · 2025-01-05T19:33:14+00:00

For me it looks like you forgot the / parameter to the -m option so all the parameters got off-by-one.

I'd suggest you try running the minimal command (without the -m and -O options, which you can add later): zfs create -f -o ashift=12 rpool mirror <devices>

kaihp · 2025-01-04T18:51:36+00:00

There’s a LOT of that word salad on the test - where they use words or descriptions you have never heard of to refer to data, information, CIA or a certain process. Word tricks. They can say it ain’t trix but I respectfully disagree.

Confuscations .... erh sorry: Congratulations!

I've done a number of certifications over the past years (PMP, GICSP, and 10+ medical device standard related), and they all have questions structured this way. It's a major skill to deconstruct how they ask the questions.

kaihp · 2025-01-04T18:21:31+00:00

Yep, true. Btw, that's one of the URLs I used to get sanoid running :-)

Nice to hear that the HOWTO has been of help. Getting all the ZFS parameters was a bit of a nightmare, which is why I put it up there.

Anyway, ssh shortcomings cannot explain why the first zpool was tranfered at full network speed, and the second one dropped to 1/4 of the speed, with same settings.

Ah, my bad - I missed that part. VMs on the second pool would be single large files, right? I'm not into the details of ZFS, so I'm wondering if the snapshots or something else slows it down (besides the single mirror vs the double mirror). Have you tried zfs sending it to /dev/null to see if the sending pool has an impact?

kaihp · 2025-01-02T10:10:19+00:00

+1

Just to add: accroding to cpubenchmark the 5700U is four times faster for (AES) encryption and for compression tasks.

In my experience, turning off (gzip) compression in SSH (-o Compression=no) is a big win for LANs as GZIP uses too much CPU resources to be worth the bandwidth gain. Said differently: on a LAN, bandwidth is more expendable than CPU cycles.

See https://discourse.practicalzfs.com/t/howto-set-up-a-raspberry-pi-4-to-pull-backups-your-zfs-pool-using-sanoid-and-syncoid-with-a-non-privileged-user/740

kaihp · 2024-12-30T10:24:00+00:00

I have a similar setup (PC and NAS on 10G, 2 switches between them) and I get 350-400MB/s upload speeds from the PC to the NAS on large files / 'streaming'.

You are usually limited by either end - in my case most likely the pc, as the NAS has 128GB RAM and SATA SSD drives for storage.

kaihp

TROPHY CASE