Hello Comrades,
Thanks for all your advice about setting up Linux. It was a success. The problem is that I’m now I’m intrigued and I’d like to play around a bit more.
I’m thinking of building a cheap-ish computer but I have a few questions. I’ll split them into separate posts to make things easier. Note: I won’t be installing anything that I can’t get to work on Linux.
Question about storage and swap memory.
I plan to install an SSD of maybe 128–256GB for the system files and a larger HDD for storage. I would partition the SSD so that I could install a few different distros without losing any installation. This way I can commit to some longer experiments before deciding which distro to use.
The question is: should I have the swap partition on the SSD (with the OS partition) or (separately) on the HDD?
And if I install multiple distros, do I need a different swap partition for each one? For example, if I install 16GB RAM, do I need a 16GB partition for, say, Mint, Debian, and Ubuntu? Or can I let them ‘share’ the swap partition?
Are there any additional security/privacy risks of installing more than one distro on the same SSD card?
Ideally, swap should go on the fastest storage you have. Also ideally, you want to have enough memory that you never need to swap anyway. If you have enough ram, you don’t really need swap at all.
You can definitely share swap partitions between dual booted OSes. You can even share home directories if you wanted.
No obvious additional risks that I can think of.
If you have enough ram, you don’t really need swap at all.
This isn’t really true. Swap is important for things other than acting as a memory reserve. Even if it was only used that way, it can still improve performance by paging out unused memory (such as from application startup that then isn’t used).
There are other benefits too. This link goes into details.
I’ve seen and read that before, and while I don’t have any hard data, anecdotally, my machine with 64GB ram does not have a swap file or partition and runs just fine. I have had similar results on a 32GB laptop.
The link doesn’t really go into any specific real world use cases where swap is critical, and mostly discusses the memory contention issues. Still, worth a read for anything thinking about turning swap on or off.
I don’t think the point is that swap is critical. Whether that is true will depend on your workload and hardware. But the point is it makes memory management better and more efficient. Whether you notice a difference in performance or not is again dependent on your workload & hardware. I personally see no reason to not dedicate a couple gigs to swap even with lots of memory on a personal system.
If you have a reasonable amount of RAM, you don’t even need swap, but it depends on what you need. If you do need it, it should be on your fastest drive, but it doesn’t need to be large, even something like 2 GB can be enough. You can share swap between OSes that shouldn’t be an issue, you will just to manually configure it with each one.
Also, as someone already said it might be a good idea, if you want to try multiple distros to share your home folder between OSes it should make things easier for you and save some space as well. Overall, 256 GB if you want to install multiple distros is pretty small, but it depends on what you install/what distro it is. Remember to partition your drive well, it is annoying to have to resize your disk partitions with data on it.
- Where I live SSD storage has become very cheap and the price premium for going from 200 GB class SSDs to 500 GB class is insignificant. So I’d suggest going with an entry-level 500 GB SATA SSD like the WD Blue in the first place.
- Following from that my opinion is that SSDs are big and durable enough to put swap on them without an issue, assumed that you won’t be swapping constantly. This heavily depends on the amount of RAM in the system. My old-ish laptop only has 8 GB of RAM so I run it with an additional 8 GB of swap file on the internal SSD. My main PC has 32 GB of RAM and I run it without any swap. In any case you’d want to put swap on the fastest storage possible so that your system stays somewhat responsive during swap usage.
- You can share swap partitions without any issue since swap is usually wiped/overwritten on boot.
- Every OS on your system can read any data from any disk/partition. If you want to have secure separation you need to encrypt the data.
I didn’t realise how much the price has come down for SSDs, so I see your point.
Do SSDs get worn down quite quickly, then, like USB drives?
If this is the case, is it worth getting a second, small SSD just for swap memory or would that be overkill?
On the contrary it’s better to get a bigger SSD since the writes for swap usage get distributed more evenly across the larger memory pool. Modern SSDs can take a lot of writes before degrading since their controllers are very smart. USB drives get worn out a lot faster since they lack redundancy in storage and good memory controllers.
That’s helpful, thanks.
If you don’t mind, could I ask another question, seeing as you seem to know about this topic. If I save, say, 5gb worth of pdfs, does that 5gb worth of space get worn down by virtue of storing the data? Or do drives wear down when data is deleted, added, deleted, added, moved, etc? I think it’s the latter but don’t want to assume. If it’s the former, it might be safe to save a backup onto a drive once and to store this for a long time—would it wear down the drive to e.g. read that data and/or copy it to another drive?
I would recommend you using a separate drive for each OS. If you want to test several distros, better to use virtual machines.
Absolutely go with SSD. As others have said, the price premium between a tiny 128 gig ssd and even a 1 tb ssd is comparatively tiny these days so I’d recommend going with at least 500 gigs. A m.2 PCIe ssd (i.e. small and flat) is also much faster than a 2.5’ SATA (large and boxy) ssd and the price premium is negligible these days, but make sure your motherboard has an m.2 slot - most recent cpu platforms should have one.
If you live in a country where websites such as Amazon deliver, I would recommend going to PCPartpickers and sorting through the options by price/gig (here is an example of my parameters – https://pcpartpicker.com/products/internal-hard-drive/#t=0&sort=ppgb&page=1).
At time of writing the best priced SSD seems to be the M450 1 tb for 25 USD, which is a ridiculous sale that I would personally jump on. (it is an m.2 so see above note).
Hard drives are only really good for cheap mass storage (e.g. if you have literal mountains of photoshop projects) and servers these days (e.g. those 6 or 14 tb disks from seagate), or if you’re building a computer out of literal trash with scavenged hard drives in which case i would refrain from saving anything important on them.
Handy website! $65 for 2tb m.2 SSD – prices have got a lot cheaper since the last time I built a PC. Are there any brands that you would advise to avoid?
As for the m.2 slot, would you advise that I start with the best motherboard within my budget and build up from there?
I don’t have mountains of data. Mostly I work with texts. I’ve made do with 128GB (plus a USB as a backup) for about five years now. It’s been a pain at times but I think 150GB would do me. Considering the price nowadays, I’ll likely go for a TB, maybe split on separate drives, using one as an internal data back up. Any reason why that’s a terrible idea? I’ve heard that HDD might last longer, so might be a better option than an SSD for an internal backup. Would you agree?
Even though there are lots of vendors, most SSD components are sourced from just a few companies: the NAND is from SK Hynix/Micron etc., and the controller is from Silicon Motion/Phison etc. Some of the larger vendors (Intel, Samsung, Crucial, Hynix, WD) produce their components in-house and are also more reputable, but the actual differences most of the time are minuscule. I would recommend purchasing from one of those vendors, but at lower price points (e.g. Intel’s 670p or Crucial’s P3) they often use cheaper QLC NAND which throttle the sustained write speeds when copying lots of files, and also have lower endurance. Laptop users generally don’t have a problem with these if all they need is snappy-enough everyday use, but professional users (e.g. copying tons of photos) might lose time or reliability depending on their use case. If I’m penny-clinching, I would recommend picking out the cheapest drives with the characteristics you desire (e.g. pcie generation and capacity), then doing your research as to componentry. If I wasn’t trying to save every last penny right now, I would probably get the Crucial P5 Plus 1TB because it’s from a reputable brand and a noticeable improvement over cheaper drives ($49). At higher capacities, I’d be more inclined to simply get the best of the best considering how cheap the (gen 4) prices are right now, or at least close to it such as with the samsung 980 pro 2TB.
For motherboards, having an m.2 slot is probably not an issue if you’re buying new. my advice would be to pick a chipset that supports the cpu you want (e.g. z790/b760 for intel’s latest, x670/b650 for am5), then sort by price while looking for the other qualities you might want first (e.g. overclocking, xmp, onboard wifi, networking, decent onboard audio). speaking of motherboards, what cpu do you think you’ll get?
I’m not qualified to speak on redundancy or backups.
