Safety Engineer, Dad, Husband, Pilot, Musician. Not necessarily in that order.

Ingenieur für funktionale Sicherheit, Vater, Ehemann, Pilot, Musiker. Nicht notwendigerweise in dieser Reihenfolge.

  • 2 Posts
  • 16 Comments
Joined 1 year ago
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Cake day: June 11th, 2023

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  • 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.



  • Yes. I use a G7 N36L as an offsite-backup server in my second apartment. Works great with NetBSD and zfs, using rsnapshot to make remote backups every night.

    Since it is only active for an hour and a half each night, it is my only server to put the disks into powersave mode the rest of the time. Computing eprformance is so low that I don’t even run a folding@home client. It usually cannot finish any work package before the deadline.





  • 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.


  • 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 “!”.)






  • I found nextcloud easier to set up than many other services, plus it comes with cloud file storage and other goodies as a bonus.

    It is even easy on such obscure platforms as NetBSD in an nvmm-backed qemu virtual machine runnning on a NetBSD host.

    (EDIT: well, it wasn’t really trivial, the database (PostgreSQL in my case) setup and connection is not necessarily obvious to someone who hasn’t done it before, but the fact that it works without real complications on very diverse platforms is a testament to its clean code.)




  • I also signed up to Mastodon, mostly to support the digitalcourage.social server, but probably won’t be using it a lot. I didn’t use Twitter, either, but Reddit. I will probably continue to use /r/flying and /r/synthesizer, as they are so niche that I cannot expect anything comparable here.

    I’ll have to figure out how to post with Mastodon account on Lemmy.