[-] Hopfgeist@feddit.de 11 points 11 months ago

mixing drive models is certainly not going to do any harm

It may, performance-wise, but usually not enough to matter for a small self-hosting servers.

[-] Hopfgeist@feddit.de 7 points 1 year ago* (last edited 1 year ago)

I'm not touching that post again. But a small rant about typesetting in lemmy: It seems there is no way whatsoever to put angle brackets in a "code" section. In an overzealous attempt to prevent HTML injection, everything in angle brackets is just removed when posting (although it remains there in preview). In normal text, you can use "<", but not inside "code" segments, where it will be retained verbatim.

8
submitted 1 year ago* (last edited 1 year ago) by Hopfgeist@feddit.de to c/selfhosted@lemmy.world

I know that for decades now, hard disks don't really reveal their actual internal geometry (which is complicated anyway, since inner cylinders may have fewer sectors than outer cylinders, etc.), and present fictional geometries to satisfy legacy software, but I found it weird anyway.

I have a ZFS raidz2 NAS which originally consisted of 8x2 TB SAS disks and is now in the process of being live-upgraded to 8x4 TB (change disks one by one, resilver, change, resilver, etc ...)

I now have four of the disks replaced, and in NetBSD they all report different geometries. They all report the exact same number of total blocks, so it's not actually an issue, but still strange.

sd0 at scsibus0 target 0 lun 0: <SEAGATE, ST4000NM0023, GE11> disk fixed

sd0: 3726 GB, 330809 cyl, 10 head, 2362 sec, 512 bytes/sect x 7814037168 sectors

sd1 at scsibus0 target 1 lun 0: <SEAGATE, ST4000NM0023, GE11> disk fixed

sd1: 3726 GB, 348145 cyl, 10 head, 2244 sec, 512 bytes/sect x 7814037168 sectors

sd3 at scsibus0 target 3 lun 0: <IBM-B040, ST4000NM0023, BC5P> disk fixed

sd3: 3726 GB, 342419 cyl, 10 head, 2282 sec, 512 bytes/sect x 7814037168 sectors

sd7 at scsibus0 target 7 lun 0: <IBM-B040, ST4000NM0023, BC5P> disk fixed

sd7: 3726 GB, 341874 cyl, 10 head, 2285 sec, 512 bytes/sect x 7814037168 sectors

Two of them are IBM-branded (although they are in fact all Seagate Constellation ES.3), so I might expect slight differences, but even those with the same branding and the same revision present different geometries.

Anyway, probably just a curiosity, it will be interesting to find what the remaining four disks will show.

I might add that the older 2 TB disks (Seagate Constalleation ES, IBM-branded) all show the exact same geometry:

sd2 at scsibus0 target 2 lun 0: <IBM-ESXS, ST32000444SS, BC2D> disk fixed

sd2: 1863 GB, 249000 cyl, 8 head, 1961 sec, 512 bytes/sect x 3907029168 sectors

sd4 at scsibus0 target 4 lun 0: <IBM-ESXS, ST32000444SS, BC2D> disk fixed

sd4: 1863 GB, 249000 cyl, 8 head, 1961 sec, 512 bytes/sect x 3907029168 sectors

sd5 at scsibus0 target 5 lun 0: <IBM-ESXS, ST32000444SS, BC2D> disk fixed

sd5: 1863 GB, 249000 cyl, 8 head, 1961 sec, 512 bytes/sect x 3907029168 sectors

sd6 at scsibus0 target 6 lun 0: <IBM-ESXS, ST32000444SS, BC2D> disk fixed

sd6: 1863 GB, 249000 cyl, 8 head, 1961 sec, 512 bytes/sect x 3907029168 sectors

[-] Hopfgeist@feddit.de 9 points 1 year ago

RAID is generally a good thing but don’t get complacent, follow the 3-2-1 method

To expand on that: Redundant drive setup and backups serve completely different purposes. The only overlap is in case of a single disk failure, where RAID (or similar) may save the data.

Redundancy is all about reducing downtime in case of single hardware failures. Backups not only protect you from data loss in case of multiple simultaneous failures, but also from accidental deletion. Failures that require restoration of data almost always involve downtime. In short: You always need backups (unless it's strictly a local cache, and easily recreatable), but if you want high availability, redundancy may help.

3-2-1-rule for backups, in case you're unfamiliar: 3 copies of important data, on 2 different media, with 1 off-site.

[-] Hopfgeist@feddit.de 17 points 1 year ago

That's a very narrow-minded view. I thought the same thing when the iPad was new. But I changed my mind.

Sitting on the sofa and watching movies or reading news is a good application, a laptop is too clunky for that, and a phone screen is too small.

Also use as an air-navigation device (not only) light aircraft, and replacement for paper charts in airline operations. There are many legitimate uses where tablets are exactly what you want. If it's not for you, fine.

13

I have two Dell T320 servers, which work great. But I'd like to have some more CPU power, so think about upgrading to the T420. It is almost the same, except that on the T420 main board, which seems to be otherwise the identical PCB, the second CPU socket is actually installed. (In the T320 it's just empty soldering points.) My question is: Is the air baffle the same, or do I need a new one if I swap out the main board? I am aware that I will need a second CPU heatsink.

Thanks.

[-] Hopfgeist@feddit.de 10 points 1 year ago

One urgent thingis that the EU follow the UK in abandoning the ill-conceived "client-side scanning", aka Chat-Control.

1
Möwe auf Langeoog (pixelfed.de)

Davon flogen so viele so tief, dass der Schnappschuss nach nur ein paar Versuchen passte.

[-] Hopfgeist@feddit.de 5 points 1 year ago

Same here. It just says "nginx has been successfully installed" or something like that. It serves the appropriate directories or redirects to the respective virtual machines for other (sub) domains.

1

We have several phones in our family, and all connect just fine, but not the 8T. Two of the working phones are OnePlus 6T on the same LineageOS version. Are there known problems specifically with the 8T?

The phone charges fine when connected to the car, but the car does not recognize an android auto-capable phone. With the other phones, the AA icon appears instantly on the car screen, but nothing happens with the 8T. We upgraded to the latest lineageos build and tried different cables but no change.

The car is a 2019 Peugeot 5008 II, if that matters.

[-] Hopfgeist@feddit.de 4 points 1 year ago

What are the advantages of raid10 over zfs raidz2? It requires more disk space per usable space as soon as you have more than 4 disks, it doesn't have zfs's automatic checksum-based error correction, and is less resilient, in general, against multiple disk failures. In the worst case, two lost disks can mean the loss of the whole pack, whereas raidz2 can tolerate the loss of any 2 disks. Plus, with raid you still need an additional volume manager and filesystem.

[-] Hopfgeist@feddit.de 5 points 1 year ago* (last edited 1 year ago)

ZFS raidz1 or raidz2 on NetBSD for mass storage on rotating disks, journaled FFS on RAID1 on SSD for system disks, as NetBSD cannot really boot from zfs (yet).

ZFS because it has superior safeguards against corruption, and flexible partitioning; FFS because it is what works.

[-] Hopfgeist@feddit.de 6 points 1 year ago

For large storage, ECC helps a lot for avoiding storage corruption. In combination with a redundant architecture in zfs it is almost bullet-proof. (Make no mistake, redundant storage is no substitute for backups! You still need those.)

One option is to use comparatively old server hardware. I have some pretty old stuff (around 10 years) that uses DDR3 RAM, which is dirt cheap, even with ECC (somewhere around 1 €/GB). And it will be fast enough by far for most applications. The downside is higher power consumption for the same performance. The Dell T320 I have with eight 3.5" SAS disks and 32 GB RAM uses some 140 W of power, to give you a ballpark figure.

[-] Hopfgeist@feddit.de 6 points 1 year ago

What's your problem with DAVx^5? It's completely and permanently free and fully-featured on f-droid. Only the PlayStore version costs money. The authors don't want to make money, but motivate you to move away from Google infrastructure.

If you only need address/phone number sync, then nextcloud is probably overkill, but I use it, and it works great. Also for calendar sync and file storage.

(You don't need to put the community name in the title, especially not with "@", which signifies usernames. Communities are prefixed by "!".)

24
submitted 1 year ago by Hopfgeist@feddit.de to c/liftoff@lemmy.world

Many news apps also have this issue: when I follow links for some time, basically surf the fediverse, it is awkward to return "home": you have to traverse your entire journey backwards. It would be nice to have the taskbar at the bottom all the time, maybe configurable or with auto-hide. Or maybe I am missing something.

Other than that, very impressed so far! 👍 Great work!

[-] Hopfgeist@feddit.de 7 points 1 year ago

Gold-plating the connectors is actually one of the few things that does make sense. When new, they won't sound better, but they corrode less, which can, sometime in the future, make a difference, albeit very slight: surface oxidation can form a tiny capacitor. That said, I think you'd be hard-pressed to tell the difference to chrome-plated ones. But unlike lots of other esoteric "high-end" nonsense, this one has at least theoretical technical merit. And the micrometer-scale galvanic gold-plating isn't expensive, either.

[-] Hopfgeist@feddit.de 15 points 1 year ago

The BBC just reported that he resigned.

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Hopfgeist

joined 1 year ago