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When talking about backups, it's important to talk about them in a context where they're usable. That means you need to know that you can restore them, and the only way to know that is to ensure that it's semi-automated (ie. you don't have to put in a lot of effort), programmatic (ie. it's consistently repeatable), and that it's something you regularly do do (heh). There's a bunch of professional-sounding words when it comes to having disaster recovery procedures called recovery point objective and recovery time objective, but all they amount to is how much time it takes you to restore (which you only know if you practice, as above), and how much you stand to lose if you suffer catastrophic hardware loss, respectively. Depending on how paranoid you are, you may also want a disaster recovery method that doesn't use the same filesystem as your primary storage - even though I trust zfs more than anything I've ever used (because I've seen it cope with things no other filesystem could), I have a separate system in place that takes care of the most important things without relying on zfs' otherwise excellent disaster recovery techniques.
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Dec 8, 2022 20:33
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nm
Mr. Crow fucked around with this message at 20:38 on Dec 8, 2022 |
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Dec 8, 2022 20:35
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One way backups/clones (without some kind of snapshotting or shadow copy) is dangerous because it is very possible to delete files and next time a scheduled sync happens those files are deleted on the "backup" location. Edit: you see businesses with those kinds of naive backups who get hit with cryptolockers and their backup system overwrites everything with the cryptolocked files.
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Dec 8, 2022 20:39
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Klyith posted:zfs/btrfs send | zfs/btrfs receive Weirdly I tested this with btrfs and it seemed to work slower than an rsync. Might just be the version of btrfs was jank, mind you.
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Dec 8, 2022 22:43
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We have a zfs send backup that we've never tested a restore on, because we don't have the hardware capacity to do it. It scares the hell out of me.
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Dec 8, 2022 23:03
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xzzy posted:We have a zfs send backup that we've never tested a restore on, because we don't have the hardware capacity to do it. It scares the hell out of me.
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Dec 8, 2022 23:14
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waffle iron posted:One way backups/clones (without some kind of snapshotting or shadow copy) is dangerous because it is very possible to delete files and next time a scheduled sync happens those files are deleted on the "backup" location. You want incremental backups that only backup the diffs between versions and let you restore an arbirary backup that you've still got retained. Dupliciti and Deja Dupe both let you do that. It's both more space efficient and safer as it avoids the danger you talked about. You probably also want to do an image backup at least once after you've setup the incremental backups too so if it gets completely nuked for some reason you can restore the image, and have all the incremental backups already setup on that restored version which you can then also restore. I do a monthly image of my server in addition to running Dupliciti every night. I consider it just part of the ~hour of maintaince I need to do on it each month. Dupliciti requires no hands on time from me, but the image does.
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Dec 9, 2022 00:38
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Tesseraction posted:Weirdly I tested this with btrfs and it seemed to work slower than an rsync. Might just be the version of btrfs was jank, mind you. Are you using rsync -c to do checksums? Because if not, you're testing apples and oranges. Btrfs & ZFS do checksums, rsync does not by default. (TBQH I think bitrot is kinda a boogieman most of the time, but if you like the idea of checksums in your storage you should also like checksums in your backup process.) But anyways if you're using btrfs snapshots, the second time you do it you use: btrfs send -p <source/previous snapshot> <source/current snapshot> | btrfs receive <destination> And that should be faster than rsync without checksums because it doesn't have to do any comparisons at all. It's just replaying the diff between the two snapshots. You have all the thoroughness with no overhead.
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Dec 9, 2022 01:57
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If btrfs is anything like zfs, btrfs send | receive also functions at a record (or whatever equivalent btrfs uses) level, meaning if you have huge files but there's only a tiny change in the middle, only that tiny change gets sent. This might not matter for Linux^wFreeBSD isos, but if you're storing virtual machines, makes a big difference.
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Dec 9, 2022 08:58
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LTO tapes with some periodic complete backups that don't get recycled in to the tape pool to soon. Ideally two copies, one kept offsite in a fireproof safe. In the NotPetya attack, Maersk got lucky that a luckily timed powercut in Nigeria turned a server in to an offline backup that has the only remaining copy of domain controller data. Always have some offline backups.
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Dec 9, 2022 12:05
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i've been using proxmox backup server at work for about a year now and it's amazing. backing up our entire internal infrastructure every 30 minutes, because it uses bitmaps to only backup dirty blocks, so it takes like half a minute to do the entire thingPablo Bluth posted:LTO tapes with some periodic complete backups that don't get recycled in to the tape pool to soon. Ideally two copies, one kept offsite in a fireproof safe. use backblaze for offsite backups imo
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Dec 9, 2022 12:19
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Most butt solutions for backup have terrible RTO unless you're willing to pay for a shipping container full of drives, Backblaze included.
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Dec 9, 2022 15:22
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BlankSystemDaemon posted:Most butt solutions for backup have terrible RTO unless you're willing to pay for a shipping container full of drives, Backblaze included. Your plugin is showing 
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Dec 9, 2022 15:37
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BlankSystemDaemon posted:Most butt solutions for backup have terrible RTO unless you're willing to pay for a shipping container full of drives, Backblaze included. the only time you'd actually use data on an off-site backup is after something like a fire/flood, it doesn't matter if it takes a week to restore because it'll take a month to fix the server room lol
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Dec 9, 2022 15:47
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Klyith posted:My bad, apologies. No worries, no reason to know before 🙂
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Dec 9, 2022 19:58
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I'm building a new gaming/programming machine for Christmas, for the GPU I have already decided to go AMD for obvious reasons (I want Wayland and KDE). When it comes to CPU, as far as I can tell there aren't many features that will make a difference between Intel and AMD. Intel has HAAXM which is unnecessary on Linux due to KVM, and I guess Zen4 AMD has AVX512 support which might matter at some point? When it comes to the motherboard, I guess that's the important part due to various driver quality (I've been burned by Broadcom being a pain before). What manufacturers should I look for for sound, WiFi, and Bluetooth?
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Dec 11, 2022 14:12
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NihilCredo posted:When it comes to CPU, as far as I can tell there aren't many features that will make a difference between Intel and AMD. Intel has HAAXM which is unnecessary on Linux due to KVM, and I guess Zen4 AMD has AVX512 support which might matter at some point? AM5 motherboards aren't cheap, though they aren't silly-expensive like they were at launch. If AMD supports AM5 as well as they did AM4, where a launch board is viable to upgrade with a new CPU several years later, NihilCredo posted:When it comes to the motherboard, I guess that's the important part due to various driver quality (I've been burned by Broadcom being a pain before). What manufacturers should I look for for sound, WiFi, and Bluetooth? On AMD, it looks like almost all AM5 mobos with built-in wifi are coming with a new "AMD" branded wifi chip which is actually make by mediatek. On the good side: it's pretty standard across the whole range, it has linux drivers in kernels newer than 5.17, and it's not realtek garbage. On the bad side: it's not the Intel AX. I dunno, googling it on reddit doesn't show massive numbers of complaints. Some people report problems but it seems low volume and by non-experts, so I might just write it off as people blaming the first thing they see that's different. On Intel mobos, you pretty much always get an Intel wifi module. Built-in sound is gonna be realtek everywhere. Their newest thing, the 408x chips, are weird things that actually connect via the USB bus (fine) and seem to have slight differences on each mobo (ugh). Realtek doesn't do much linux support. That particular chip seems worth avoiding. The current trend on high end mobos seems to be that they pair realtek audio with a fancy DAC chip instead of using the built-in DAC in the realtek chips. But the fancy DAC is still inside the high-EMI case... IMO if audio is something important to you -- you have some nice headphones and care about listening environment etc -- get an external USB audio interface. I can recommend the Schiit all-in-one USB DAC/amps which are not expensive and 100% linux friendly (they use a standard USB audio spec). It's a permanent upgrade, you never have to care about mobo audio again.
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Dec 11, 2022 15:26
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NihilCredo posted:gaming/programming
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Dec 11, 2022 15:39
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NihilCredo posted:I'm building a new gaming/programming machine for Christmas, for the GPU I have already decided to go AMD for obvious reasons (I want Wayland and KDE). It will take time to find out exactly which parts to get, but AMD does offer ECC memory support on their consumer chips, if that is a thing that you are interested in.
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Dec 11, 2022 15:48
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For the audio stuff, if you just need something to hook up headphones, get the cheap Apple dongle. It's good enough unless you need something that can output more power. That's when you start looking into headphone amps from companies like JDS Labs, Topping, Schitt, and more.
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Dec 11, 2022 15:52
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Kibner posted:It will take time to find out exactly which parts to get, but AMD does offer ECC memory support on their consumer chips, if that is a thing that you are interested in. Are there any consumer motherboards that report ECC faults?
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Dec 11, 2022 17:52
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Subjunctive posted:Are there any consumer motherboards that report ECC faults? The latest firmware update for the Gigabyte B650E Aorus Master mentions "Add ECC DIMM support" but I've not found anyone who's able to validate that NMIs are generated.
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Dec 11, 2022 18:02
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Subjunctive posted:Are there any consumer motherboards that report ECC faults? For AM4 I know that the Asus x570 ACE WS does. I haven't looked into AM5 mobos, though.
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Dec 11, 2022 18:07
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Kibner posted:For AM4 I know that the Asus x570 ACE WS does. I haven't looked into AM5 mobos, though. That’s a serious fuckin’ motherboard, nice.
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Dec 11, 2022 18:09
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Klyith posted:On AMD, it looks like almost all AM5 mobos with built-in wifi are coming with a new "AMD" branded wifi chip which is actually make by mediatek. On the good side: it's pretty standard across the whole range, it has linux drivers in kernels newer than 5.17, and it's not realtek garbage. On the bad side: it's not the Intel AX. The B550 I picked up to build a secondary desktop on also had that, which I only discovered after installing OpenSUSE 15.4 on it and the wifi didn't work. Installed Tumbleweed for the newer kernel and it's been fine since. For sound I personally just use my GPU to drive speakers, and rely on Bluetooth for headphones/earbuds. I haven't really used onboard audio for years now between those two things.
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Dec 11, 2022 21:30
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All Realtek is garbage.
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Dec 11, 2022 21:42
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I have a weird issue where Linux sometimes opens Zoom when I've been using xscreensaver for a while. Is there a fix for this? It's very odd.
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Dec 15, 2022 22:40
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F_Shit_Fitzgerald posted:I have a weird issue where Linux sometimes opens Zoom when I've been using xscreensaver for a while. Is there a fix for this? It's very odd. I never heard of this and it's been ages since I've used xscreensaver, but it got me thinking. It used to be that it would lock the computer after a while(5-10 minutes or so, configurable somewhere). To unlock it it would launch xlock, to ask for a password. Now, I don't know how it launches xlock, but it could be using xdg-open. And that determines what application to launch for a particular file (such as your default browser if the argument is an url). And then somehow, xdg-open is told to launch zoom for whatever argument it gets, as that's the preferred application for that particular file or url that it got as a param. I'd mess around the preferred applications list of your DE, see what is Zoom set to open.
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Dec 15, 2022 23:52
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If you quit your browser and then xdg-open opens it, and one of the tabs is a Zoom link (which of course is the case) then it’ll trigger the Zoom client opening.
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Dec 16, 2022 01:50
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Got a weird one, not exactly sure what to do here and a quick google gave me mostly Windows advice that doesn't seem applicable here. I got a home theater thing that I run Debian Sid on (was running stable, but I like Sid I like when poo poo breaks and I gotta learn to fix it, and there was a package that was actually too old in current stable and made it so I couldn't do some stuff, a bluetooth thing, long story but doesn't matter because it is fine in Sid.) It's a laptop with an nvidia gpu, proprietary driver (I doubt that matters here, but it might), then over hdmi to my receiver and out to a projector/5.1 speaker setup. 5.1 is setup and working with pulse, at least for the most part. In the Jellyfin client, works fine I get 5.1, in Firefox it also works fine. But, I was using Chrome for all that stuff, I used to have trouble with Firefox and playing videos on it back in the day and just ended up using Chrome for media pc stuff. I only use Chrome for this and Firefox on every other computer I use, so I don't actually know much about what to do when Chrome breaks. It used to be working, but I had to go with just stereo for a couple months while I replaced a receiver. Now, new receiver so back to 5.1, and no matter where I'm playing a video from in Chrome, netflix, youtube, wherever, it will only play in stereo. I feel like it has to be a Chrome problem if Firefox and everything else plays in 5.1 and this is the only thing not working. I'd blame Sid but, Chrome isn't coming from Debian's repos. So, I dunno, anyone heard of this before or have any idea what I would do to even figure out why it's not working? It doesn't matter much since I can just use Firefox but if I leave it unfixed it's gonna bug me.
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Dec 16, 2022 03:04
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Can we calculate when Debian will run out of Toy Story characters?
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Dec 16, 2022 06:48
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VostokProgram posted:Can we calculate when Debian will run out of Toy Story characters? There's no fixed schedule for Debian releases but I counted 109 characters on https://en.wikipedia.org/wiki/List_of_Toy_Story_characters Cant wait for Debian Bonnie's Mom and Debian A toy robot with suction cups that allow it to stick to the wall, which plays music for the bath toys Going by the amount of time it took for the last 10 named releases (not counting bookworm or anything named after) and taking that as an average, we have 174.8 years of named Debian releases left. Unless they make another toy story in that time. BrainDance fucked around with this message at 07:39 on Dec 16, 2022 |
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Dec 16, 2022 07:33
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Volguus posted:I never heard of this and it's been ages since I've used xscreensaver, but it got me thinking. It used to be that it would lock the computer after a while(5-10 minutes or so, configurable somewhere). To unlock it it would launch xlock, to ask for a password. Subjunctive posted:If you quit your browser and then xdg-open opens it, and one of the tabs is a Zoom link (which of course is the case) then it’ll trigger the Zoom client opening. OK, I'll look into that; thanks. The funny thing is that I rarely even use Zoom.
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Dec 16, 2022 16:36
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BrainDance posted:. Unless they make another toy story in that time. By that time we will be on toy story 57
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Dec 16, 2022 17:27
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nm
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Dec 16, 2022 19:34
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What is the right way for a process limited by cgroups to figure out how much memory it has available to it before it's going to get OOMKilled? I see a CLI tool called "cgget", but I'd really like a library. It looks like in cgroup v1 you could check /sys/fs/cgroup/memory/memory.limit_in_bytes from the process being controlled by the cgroup, but that's gone in v2 and instead /sys/fs/cgroup/memory.max is there. Do I have to write code to check both, if I want to run inside of cgroups v1 and v2?
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Dec 19, 2022 20:12
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I have 2 different ZFS mirror pairs in an Ubuntu 20.04 machine. One is SATA SSDs, the other NVMe, different drive vendors. Both pools get repeated checksum errors. I'm skeptical that I have 4 failing drives. All the hardware and OS install are ~2 years old. What is going on? Scrubs are fine and occasionally fix data, usually no-op. Mostly asking out of curiosity, the machine is due a repave and probably without ZFS this time.
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Dec 19, 2022 21:49
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Mao Zedong Thot posted:I have 2 different ZFS mirror pairs in an Ubuntu 20.04 machine. One is SATA SSDs, the other NVMe, different drive vendors. Both pools get repeated checksum errors. I'm skeptical that I have 4 failing drives. All the hardware and OS install are ~2 years old. What is going on? Scrubs are fine and occasionally fix data, usually no-op. Mostly asking out of curiosity, the machine is due a repave and probably without ZFS this time. Have you tested the RAM lately? In the past I had a machine that would slowly get more and more corrupt until I had to reinstall, and after a lot of testing it turned out to be ever so slightly bad RAM that was causing errors to build up over time.
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Dec 19, 2022 21:53
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CaptainSarcastic posted:Have you tested the RAM lately? In the past I had a machine that would slowly get more and more corrupt until I had to reinstall, and after a lot of testing it turned out to be ever so slightly bad RAM that was causing errors to build up over time. I haven't, I should. That does seem like a likely candidate.
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Dec 19, 2022 21:54
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Does linux make things specifically obtuse for users? Like I'm supposed to mount a /dev/something folder to my docker so home assistant can use my USB bt dongle. But I have no idea which /dev/something it is. Lsusb lists these: Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002 Device 002: ID 8087:0025 Intel Corp. Wireless-AC 9260 Bluetooth Adapter Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Tablet Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Like.. which one it is. No idea.  /dev folder has all kinds of folders but the names are not self-explanatory: code:Edit: apparently I just had to install "bluez" and use /var/run/dbus as the folder instead of /dev/bus.. Ihmemies fucked around with this message at 22:47 on Dec 19, 2022 |
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Dec 19, 2022 22:30
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