- ZFS's design requires RAM to be perfectly reliable, or at least report imperfections. Undetected bitrot in RAM can and will destroy your entire ZFS pool. Thus, a machine with ECC RAM installed is a requirement.
- As if that weren't enough, ZFS eats huge amounts of RAM. The current guideline is 1 GiB of RAM per TB of disk spindles, with 8 GiB as a practical minimum.
- ZFS assumes it has perfect knowledge of disk writes in-flight, and as such doesn't play well with RAID controllers, which can silently re-order writes. If your machine has a RAID controller, the RAID features should be turned off. Don't worry, ZFS has its own RAID features. However:
- Because drive densities are now approaching drive error rates (10**13 bits of storage, with manufacturers quoting uncorrectable errors every 10**14 bits read), ZFS RAID-Z1 is no longer considered sufficient to ensure storage integrity, and you should plan for RAID-Z2 (two parity drives).
- For the same reason as turning off RAID, a "production" FreeNAS/ZFS installation should not be run in a virtual machine. It's okay if you're just test-driving it to get a sense of what it can do, but a live system should run on actual hardware.
- Using ZFS's de-duplication feature is officially discouraged. It may seem like a great idea, but it will gobble all your RAM and return very little benefit. On average, you're better off using compression.
When ZFS dies, it dies in a big and fairly comprehensive way, and ZFS will die if you under-provide it. In any event, you should RTFM before contemplating a build, and know the trade-offs you're getting in to.
I don't have time to correct all the errors in the parent post. So very briefly:
- The 6502 had three 8-bit registers: A, X, and Y. A was the accumulator, and received the result of all arithmetic operations. X and Y could hold temporary data, arithmetic operands, and be used as index registers for memory load/store. There was also an 8-bit stack pointer register, SP, hard-mapped to the range 0x0100 - 0x01FF.
- The 8080 had the 8-bit registers A, B, C, D, E, H, L, and a 16-bit stack pointer. In addition, the registers B & C, D & E, and H & L could be used to hold 16-bit quantities for some instructions.
- The Z80 had all the registers of the 8080, plus a shadow copy of the registers for quick use by interrupt service routines.
- The 6502's zero page (0x0000 - 0x00FF) got special treatment by the CPU, using only a single byte to address a location. As such, zero page usually got treated by software as a pile of "slow registers."
- No instruction on the 6502 executed in fewer than two clock cycles. The fastest 6502 I ever saw was 2 MHz.
- By contrast, 4 Mhz Z80 chips were widespread.
- The Z80 helped popularize dynamic RAMs by containing a very basic DRAM refresh counter. The 6502 had no such thing; DRAM refresh was usually provided by custom logic, usually part of the video controller.
- S-100 machines had huge power supplies because they had huge numbers of slots (eight or more being common), and had to have enough reserve power for all of them.
- There was nothing special about the 6502's memory access patterns, and 6502 would get starved out like any other CPU if another device held the bus. On the C-64 in particular, every eight video lines, the VIC would grab the bus for 40 uSecs to fetch the next row of character cells, holding off the 6502 the whole time. This led to all kinds of problems with timing-sensitive operations, and was directly responsible for transfers to/from the 1541 floppy drive to be glacially slow.
You dismissed out of hand real conditions in China, which I addressed, because they're like, you know, the fucking topic.
YOU brought up the topic of movie production being included in GDP. I addressed it because YOU brought it up, asshole.
I brought up specifics vs. aggregates because YOU started talking about the steel industry for no reason.
I addressed YOUR points, which often were off the original topic, and you fault ME for addressing YOU?
Then you foe me. Wow. That's special. Consider it mutual, you ignorant, time-wasting shithead.
Signed, Emmett Watson
P.S. If you really want to understand Seattle, you better start watching reruns of Almost Live.
GDP should contain movie production costs. Do you even know what GDP is? What makes you think making a movie and selling it is ultimately any different from making a John Deere tractor and selling it? It's the economy, stupid. Even if US GDP is fudged slightly (which could be said of practically any economic metric), the PRC's is drastic. At least 5%, and when you're talking about the second largest economy on Earth, that's hundreds of billions of dollars.
What point is there on zooming in on x or y industry? Sure there are growth sectors in any country, but we're talking about aggregates. I mentioned that the growth in usage of electricity in China doesn't match GDP because, most economists agree, electricity is one of those things that goes up in demand commensurate to the growth in all other sectors, because basically everything needs energy to run. As for specific economists, I'm not paid to be your research bitch. I've spent a lot of years following news and events in China, and if you really want to learn something do your own reading. The first several articles all deal with this issue.
BWAaaaaHAHAHAHAHAHAHAHA! Oh wait, you're serious?
Do you have any idea what the debt load is of the provincial governments? Do you even know that provinces and other lower levels of the Chinese government are taxing their constituents months, sometimes years in advance to try to maintain solvency?
Do you know that the statistics on things like the expansion of electrical power usage do not line up in any even remotely sane way with the CCP's claims of GDP growth and many economists believe that their rate of growth is now the same as the stagnant West?
Do you know anything about the economic reality in China at any level above shit you make up to promote your pet theories?
The PLA and PLAAF are sizable, formidable forces, and a land war with China would be a nightmare, but the PLAN is a joke, at least to the US. To the small navies of its neighbors, it's serious business, but then they all ultimately depend on US intervention for defense anyway. SEATO4EVAR
I occasionally go two months without opening my front door. I use my garage door as an ersatz front door.
By the same token, people who were deaf who through new surgical methods are made to be able to hear, actually have a very hard time adapting to it. We who can hear take for granted the period in infancy when we develop the mental capacity to reflexively filter out background noises and such. People who were deaf lack the automatic mental controls, and in a sense, can't stop hearing, which makes it hard for them to focus on specific sounds (and hard to sleep). It's so bad that some even have the surgery reversed and voluntarily go back to being deaf because to them it's better than a sense of hearing that they can't control.