- cross-posted to:
- linuxhumor@lemmy.ml
- cross-posted to:
- linuxhumor@lemmy.ml
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Commands like
ddare the best. Good ole greybeard-era spells with arcane syntax and the power to casually wipe out the whole universe (from their perspective ofc) if used haphazardly or not in respectful manner.What do you mean? Explicitly having to set
if=andof=is way harder to screw up than mixing up the order of arguments for e.g.cp.I could swear the argument order to “ln” swaps every now and then!
Unless you forget what if and of mean. With
cpit’s simply “cp what where”. Never had problems remembering that.is it really hard to remember infile and outfile?
No, but you’re just typing if and of, not infile and outfile, and the letters are right next to each other on a qwerty kbd. One can haphazardly misuse a lot of commands, it’s just that some commands may lead to nastier outcomes than others.
I never had any problems with
cpeither. But the post makes it seem likeddis somehow more error prone, which makes no sense to meWell, usually dd is not used as often as cp, so there’s a bigger chance of messing up the parameters, unless you’re careful and rtfm first.
Computer equivalent of vacuum decay in our universe…
IMHO, it was a mistake to make USB block storage use the same line of names also used for local hard disks. Sure, the block device drivers for USB mass storage internally hook into the SCSI subsystem to provide block level access, and that’s why the drives are called sd[something], but why should I as an end user have to care about that? A USB drive is very much not the same thing for me as a SCSI harddisk. A NVMe drive on the other hand, kinda sorta is, at least from a practical purpose point of view, yet NVMe drives get a completely different naming scheme.
That aside, suggest you use lsblk before dd.
Yeah lsblk, lsscsi, fdsik -l , go have a coffee, come back later and hit enter on dd
Yeah lsblk, lsscsi, fdsik -l , go have a coffee, come back later and hit enter on dd
Then realize you typed the command wrong and panic when you don’t get an error.
I still made the mistake, when I sleep deprived switched if and of somehow
My then girlfriend wasn’t exactly happy, that all here photos and music, which we just moved off old CDs, that couldn’t be read correctly anymore, and I spent quite some time to finally move themObviously the old CDs and the backup image were thrown out/deleted just a few days earlier, because I proudly had saved the bulk of it - and being poor students having loads of storage for multiple backups wasn’t in reach.
Backing them up again to fresh CDs was on the plan, but I quickly needed a live USB stick to restore my work laptop…Since then I’m always anxious, when working with dd. Still years later I triple check and already think through my backup restoration plan
Which is a good thing in itself, but my heart rate spikes can’t be healthyWhile we’re at it, can we also rename the hard drive block devices back to
hdinstead ofsdagain? SATA might use the SCSI subsystem, but SATA ain’t SCSI.At least sata is well on its way towards dying, so the problem will solve itself in some more years.
My machines all have nvme exclusively now, only some servers are left using sata. And I would say the type of user at risk of fucking up a dd command (which 95% of the time should be a cp command) doesn’t deal with servers. Those are also not machines you plug thumb drives into commonly.In 5-10 years we will think of sda as the usb drive, and it’ll be a fun-fact that sda used to be the boot drive.
does that mean that you dont use hard drives at all? how many storage have you got?
I have a nas with 32TB. My main pc has 2TB and my laptop 512GB. I expected to need to upgrade especially the laptop at some point, but haven’t gotten anywhere near using up that local storage without even trying.
I don’t have anything huge I couldn’t put on the nas.At this point I could easily go 4TB on the laptop and 8TB the desktop if I needed to.
Spinning rust is comparable in speed to networking anyway, so as long as noone invents a 20TB 2.5’’ hdd that fits my laptop for otg storage, there would be no reason something would benefit from an hdd in my systems over in my nas.Edit:
Anything affordable in ssd storage has similar prices in M.2-nvme and 2.5’'-sata format. So unless you have old hardware, I see the remaining use for sata as hdd-only.So unless you have old hardware, I see the remaining use for sata as hdd-only.
how many M.w slots do current motherboards have? a useful property of SATA is that it’s not rare to have 6 of them
M.2 nvme uses PCIe lanes. In the last few generations both AMD and intel were quite skimpy with their PCIe lane offering, generally their consumer CPUs have only around 20-40 lanes, with servers getting over 100.
In the default configuration, nvme gets 4 lanes, so usually your average CPU will support 5-10 M.2 nvme SSDs.
However, especially with PCIe 5.0 now common, you can get the speed of 4 PCIe 3.0 lanes in a single 5.0 lane, so you can easily split all your lanes dedicating only a single lane per SSD. In that configuration your average CPU will support 20-40 drives, with only passive adapters and splitters.
Further you can for example actively split out PCIe 5.0 lanes into 4x as many 3.0 lanes, though I have not seen that done much in practice outside of the motherboard, and certainly not cheaply. Your motherboard will however usually split out the lanes into more lower-speed lanes, especially on the lower end with only 20 lanes coming out of the CPU. In practice on even entry-level boards you should count on having over 40 lanes.As for price, you pay about 30USD for a pcie x16 to 4 M.2 slot passive card, which brings you to 6 M.2 slots on your average motherboard.
If you run up against the slot limit, you will likely be using 4TB drives and paying at the absolute lowest a grand for the bunch. I think 30USD is an acceptable tradeoff for a 20x speedup almost everyone on this situation will be taking.
If you need more than 6 drives, where you would be looking at a pcie sata or sas card previously, you can now get x16 pcie cards that passively split out to 8 M.2 slots, though the price will likely be higher. At these scales you almost certainly go for 8TB SSDs too, bringing you to 6 grand. Looking at pricing I see a raid card for 700usd, which supports passthrough, i.e. can act as just a pcie to M.2 adapter. There are probably cheaper options, but I can’t be bother to find any.Past that there is an announced PCIe x16 to 16 slot M.2 card, for a tad over 1000usd. That is definitely not a consumer product, hence the price for what is essentially still a glorified PCIe riser.
So if for some reason you want to add tons of drives to your (non-server) system, nvme won’t stop you.
that’s good to be aware of, but using nvme drives for lots of storage does not seem to be economical. (I assume) in most cases large amounts of storage like this is used for archival and backups, where speeds don’t matter over what good HDDs can do.
Oh yeah absolutely. As mentioned above I myself use spinning rust in my nas.
The difference is decreasing over time, but it’ll be ages before ssds trump hdds in price per TB.The difference now compared to in the past is that you are looking at 4TB SSDs and 16TB HDDs, not 512GB SSDs and 4TB HDDs, and in my observation the vast majority has no use for that amount of storage currently, while the remainder is willing or even happy to offload the storage onto a separate machine with network access, since the speed doesn’t matter and it’s the type of data you might want to access rarely but from anywhere on any kind of device.
Compare for example phones that are trying to sell you 0.25 or 0.5 TB as a premium feature for hundreds of usd in upmark.
If anyone had use for 2TB of storage, they would instead start at 0.5 and upsell you to 2 and 4 TB.I myself have 32TB of storage and am constantly asking around friends and family if anyone has large amounts of data they might wanna put somewhere. And there isn’t really anyone.
Even the worst games only use up so many TB, and you don’t really wanna game off of HDD speeds after tasting the light. And if you’d have to copy your game over from your HDD, the time it’d take to redownload from steam is comparable unless your internet is horrifically bad.
My extensive collection of linux ISOs is independent and stable, and I do actually share it with a few via jellyfin, but in all its greatness both in amount and quality it still packs in below 4TB. And if you wanna replicate such a setup you’d wanna do it on a dedicated machine anyway.If I had to slim down I could fit my entire nas into less than 4TB if I’m being honest with myself, in my defense I built it prior to cost-effective 4TB SSDs. The main benefit for me is not caring about storage. I have auto backups of my main apps on my phone, which copy the entire apk and data directories, daily, and move them to the server. That generates about 10GB per day.
I still haven’t bothered deleting any of those, they have just been accumulating for years. If I ever get close to my storage capacity, before buying another drive I’d first go in and delete the 6TB of duplicate backups of random phone apps dated 2020-2026.
I wrote a paper grouping together info of tons of simulations. And instead of taking out the measurement files containing the relevant values every 10 simulation steps (2.5GB), or the data of all system positions and all measured quantities every 2 steps (~200GB), I copied the entire runtime directory. For 431 simulations, 8.5GB per, totaling 1.8TB.
And then later my entire main folder for that entire project and the program data and config dirs of the simulation software, for another half a TB. I could have probably saved most of that by looking into which files contain what info and doing some most basic sorting. But why bother? Time is cheap but storage is cheaper.But to go for simply the feeling of swimming in storage capacity, you first need to experience it. Which is why I think noone wants it. And those that do already have a nas or similar setup.
Maybe you see a usecase that would see someone without knowledge or equipment need tons of cheap storage in a single desktop pc?
doesn’t the nas use spinning rust?
It does
S-ATA still is the only way to have more than two drives in the system.
My motherboard has 3 nvme bays.
If I saw the need, there are cheap pcie to nvme cards, since (non-sata) nvme is just directing pcie lanes to the ssd anyway.But like I said below, I don’t even have the need to get a single ssd at the currently maximum price-effective size of 4TB, no less two or three.
In my observation putting mass storage into your pc is dying in favor of either not needing that much storage, or putting it in a nas or other internet-accessible device.Even my non-IT friends do things like put their hdd in a usb enclosure and attach it to their (internet accessible) router.
Always
lsblkbeforedd. The order of /sdX might change from boot to boot. Only /nvme doesn’t change.First thing I do after loading the liveusb is write the “mylsblk” which does the much more sane thing of:
lsblk -o NAME,LABEL,PARTLABEL,UUID,SIZE,MOUNTPOINTSWhy is this?
It’s a design thing. BIOS can know NVMe disks’ location because they’re directly mounted to PCIe. SATA isn’t like this. Similar logic with the RAM slots.
deleted by creator
–status=progress. So happy when they added this.
If only I could remember to set
status=progress…I always end up using
killall -USR1from another terminalSo I don’t have to install ddrescue every time I clone a disk from a live USB anymore? Awesome
I am become dd, the destroyer of disks
“/dev/sdb? It’s sdb? With a B? Yep that’s the flash drive. Just type it in…
of=/dev/sdwhat was the letter again? B? Alright,/dev/sdb. Double check withlsblk, yep that’s the small disk. Are my backups working properly? Alright here goes nothing… <enter>”i always just
cat /dev/??? > /dev/nullto make sure the usb blinks
More like *screams into the void*
Me laughing with /dev/nvme0n1p1
well i mean, the original meme was referring to a usb device with an led…
That’s a good way of doing it
This is the only reason why I still use GUI for making Linux USBs. Can’t trust my ADHD ass to write the correct drive name. Also, none of my USB drives have a light.
Popsicle is pretty nice, it doesn’t let you choose the internal drives afaik.
Luckily, this problem will disappear soon as we’re moving to systems with only nvme drives. Kinda hard to mistake /dev/nvmexny for /dev/sdx.
Are we though? My RPI uses a SD card and is labels it as
sdand the same is true for virtual machines.The RPIs are moving to nvme too, though indeed a bit slower than desktop machines. My virtual machines use /dev/vdx, and I don’t typically connect USB drives to my virtual machines with the intent to flash them :)
I’m a cheap ass who mostly gets old hardware, so it’ll probably be a while before I get to see the benefits of that.
Well, try not to shred too many SATA SSDs then until you get there 🤡
You all still have a LED inside USB flashdrive?
Yep! I just installed Void about ten minutes ago off a 2GB stick from the mid-2000s. Somehow, those little sticks just keep going!
Same! I have a 4gb white SanDisk stick, from like 12-14 years ago and is still working 💀💀 it even died on me once, and started working again after a few days 😳😳
Keep them around. I was playing with and testing some ~15 years old mobos for work, and they would not boot from any USB3.0 stick I tried. Same images on an 8GB USB2.0 stick booted with no problem.
Name and shame: Biostar motherboard
Don’t worry, you can still buy USB 2.0 sticks nowadays.
They’re priced almost the same as USB 3.whatever sticks. Literally. Add an euro or 2 and double the capacity and go to usb 3.0
for an usb, it might work. For such an old hard drive, it won’t. Linux will refuse to boot
I don’t think so. Block device is a block device.
Maybe you have better knowledge, please elaborate.
i know it from experience. When i wanted to install a modern Linux on a 2009 hdd, it installed, but simply refused to boot, even though hdsentinel said the hdd is 100℅ healthy
?
I buy them specifically with LED. It s helpful for data transfer, but also helpful for doing a flash of new OS to old nas hardware… You have to hold reset button in on nas until you see it start to read USB (by LED) then you know you can release the reset button.
We seriously need a series of DD-Command 4 Dummies guides<br> Also you guys have USB drives with lights ???
Remember kids, always lsblk before you dd
heh i do it hardcore, my USB has no light ;)
Don’t confuse if and of!
don’t cross the streams
/dev/disk/by-id/xxx works for me. Never made a mistake.
Reminds me of the DOS days of my youth.
fdisk does not stand for friendly disk.
