HorstG

11 ms·

31.
by HorstG 7y ago
This is exactly what overprovisioning is: The sum of possible future allocations is greater than available space.
32.
by HorstG 7y ago
Yes. RAIDz (without the "1") was the original RAID5-equivalent, RAIDz2 is equivalent to RAID6. However since nobody really knows what the hell z1 and z2 is and z1 is easy to mix up with RAID1 for nonZFS people, calling it z5 and z
33.
by HorstG 7y ago
ZFS does overprovision all filesystems in a zpool by default. Create 10 new filesystems and 'df' will now display 10x the space of the parent fs. A full fs is handled differently than your volume manager running out of blocks. But
34.
by HorstG 7y ago
And after donating credentials, the donor and IT are better off just claiming the password was "phished" ( winkwink ) when caught.
35.
by HorstG 7y ago
Why? What is bad about playing around with leftover hardware?
36.
by HorstG 7y ago
Performance wasn't robust, especially on dead disks and rebuilds, but also on pools with many (>100) filesystems or snapshots. Performance would often degrade heavily and unpredictably on such occasions. We didn't loose data mo
37.
by HorstG 7y ago
I think the optimal number of RAIDz5 disks is 3, if you just want performance. But this wastes lots of space of course. Also, the number of SAS/SATA-channels per controller and the topology of expanders is important. Thats why I don&#x
38.
by HorstG 7y ago
Education might not be the same as research in this license's terms. And there are even software vendors picking nits about writing a thesis being either research or education, depending on their mood and purse fill level...
39.
by HorstG 7y ago
"Proven" is a maybe impossible standard: Kernel devs hint at the GPLonly exports having been useful in certain cases they prefer not to discuss on a ML. https://lore.kernel.org/lkml/20190110131132.GC20217@kroa
40.
by HorstG 7y ago
Some features such as Raid5 were still firmly in "don't use if you value your data" territory last I looked. So it is important to be informed as to what can be used and what might be more dangerous with btrfs
41.
by HorstG 7y ago
Rust and Go both can have C-based libs linked to their address space thus exposing them to the same problems ASLR diminishes (I accidentially wrote "solves" here. ASLR solves nothing, it just makes exploits harder. It's a hol
42.
by HorstG 7y ago
Alcohol cools by widening the blood vessels in your skin and extremities. This makes you feel warmer, yet it lowers your overall average and core temperature. This is what makes alcohol in cold weather so dangerous: it really helps your col
43.
by HorstG 7y ago
Stripe size could have been a problem, though we just went with the default there afair. Most of the first tries was just along the Sun docs, we later only changed things until performance was sufficient. Dedupe wasn't even implemented
44.
by HorstG 7y ago
Actually, this matters a lot in many enterprises. Beancounters hate excess capacities, so there are never enough spares and everything is always almost full. Maybe SV is different...
45.
by HorstG 7y ago
Most non-hobbyist RAID hardware does online-scrub just fine (not that I would recommend wasting money on such hw). Btw, ZFS scrub is not only a RAID-block-check but also a partial fsck, so its not really comparable.
46.
by HorstG 7y ago
Group your disks in bunches of 4 or 5 per Raidz, no more. And have them on the same controller or SAS-expander per bunch. Use striping over the bunches. Don't use hotspares, for performance maybe avoid RAIDz6. Try out and benchmark a l
47.
by HorstG 7y ago
We had a bunch of Thumpers (SunFire X4200) with 48 disks at work, running ZFS on Solaris. It was dog slow and awful, tuning performance was complicated and took ages. One had to use just the right disks in just the right order in RaidZs wit
48.
by HorstG 7y ago
Hardware tooling is bad. Like really lifesuckingly bad. Download yourself some free Xilinx IDE and try to do some Verilog Hello World on a cheap demo board. Blink a LED or something. Its so bad you will want to scream: Dog slow sythesis (~c
49.
by HorstG 7y ago
Yes, making the bombs themselves seems to be easy. The difficulty comes from U232-contamination which decays into strong gamma emitters, making handling difficult. However, there seem to be paths for the production of pure U233 from chemica
50.
by HorstG 7y ago
They are not wrong, but also not right in all scenarios. Truth very much depends on the reactor design. Thorium is often associated with Gen4 reactors which are responsible for the claims of superior safety. Not much, but some of the safety
51.
by HorstG 7y ago
It is useless to make claims about a particular fuel without looking at a concrete reactor design. Leftover isotopes for example are very dependent on neutron flux and neutron energy as well as general breeding properties of the reactor. Th
52.
by HorstG 7y ago
There is such a system in Germany, called Grüner Punkt or Duales System. They tax manufacturers' packaging and run the collection and recycling from that tax income. Imho it didn't help all that much. I did not find numbers for th
53.
by HorstG 7y ago
Upgrading Windows7 to Windows 10 usually needs a hardware upgrade. And installing windows and office and decrappifying it takes ages. Rather replace with your favourite Linux, no hardware upgrade necessary, LibreOffice is included, Spyware,
54.
by HorstG 7y ago
But the outcome would probably just be a law exempting politicians from the location tracking.
55.
by HorstG 7y ago
Yes. Namespace support has been a great source of CVEs, and disabling all kinds of unneeded namespace functionalities is one of the first steps when hardening a Linux kernel.
56.
by HorstG 7y ago
afaik (second hand) CO2 is used for safety reasons, humans can sense a CO2 poisoning but not an excess of nitrogen.
57.
by HorstG 7y ago
We do. But the bureacracy responsible for enforcement is toothless, understaffed, intransparent and sometimes maybe even corrupt: https://de.m.wikipedia.org/wiki/Bayern-Ei-Skandal https://m.faz.net/akt
58.
by HorstG 7y ago
Another possibly related factor in univerity cafeterias: The kitchen personell are public employees, underpaid but unfireable. As our cafeterias head chef told me, this causes them to not caring one tiny shred about anything. The chef can&#
59.
by HorstG 7y ago
The Cybertruck can't be brutalist because it us not ugly enough... At least it is far less ugly than anything properly called brutalist. Its rather nice, comparable (but not as good) as e.g. the Lamborghini Countach and similar designs
60.
by HorstG 7y ago
From the employee side, there should not be an extra cost to pay. The problem is with companies and bosses wanting people to come to the office. That is what needs to be fixed, therefore the company needs to be taxed, not the employee. Taxi

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