Re: [9fans] Hardware recommandations for new CPU and file servers
On Thu, 06 Jun 2013 08:48:14 +0200 lu...@proxima.alt.za wrote: > > What capacity and features were you looking for? > > I'm looking to eliminate the 220V circuit between UPS and PSU > altogether, I believe it to be archaic and inefficient. I'm also > looking for multiple inputs, so that eventually it will be possible to > connect the PSU directly to solar panels as well as to any available > generator (this is Africa: lots of sun, but the demand for electricity > outstrips the supply). You might want to google "living off the grid" (which, I am sure, makes people in the poorer nations laugh). You should be able to find stuff about 12V appliances, DC-DC converters, etc. etc. > I've done some homework and I'm not happy with commercial offerings as > available here. I'm looking for a circuit that can be built by an > amateur and will power a single conventional desktop computer (let's > say 300W), while at the same time it can be scaled to supply as many > such desktops as needed. Given the handful of DC supplies required by > the average motherboard, the idea of stacking PSUs makes a lot of > sense to me. But what is the market? In places with very unreliable electric supply people either make do without electricity or if it is affordable use diesel generators (and now roof mounted solar panels with inverters). On the RaspberryPi.org site there is an article about setting up RaspberryPi computers in a rural school in Ghana. I think something like that may be a more appropriate solution. You can find relatively simple designs for low power supplies but generating 300W will be nontrivial. Particularly if you are want to build many Still, a laudable goal. Have you checked out various do-it-yourself sites?
Re: [9fans] Hardware recommandations for new CPU and file servers
> Still, a laudable goal. Have you checked out various > do-it-yourself sites? I think I have a cultural inability to search the web, but I certainly did try. That I actually found a single supplier of Li-Ion battery backed-up PSUs for desktop computers suggests that there is the engineering savvy and possibly even a marketplace for such devices. The marketplace itself is not terribly relevant, I'd be satisfied with a higher unit cost if in some way it was possible to add capacity in steps. Being able to build it from readily available components (deep discharge lead-acid batteries are one annoyingly unavoidable expense) is important and one would like modules that can be trusted to last a long time - if necessary by over-engineering them a little. I will have a look at off-the-grid suggestions, but I fear they tend to focus on pre-built modules and in my opinion the hobbyist can focus on issues that commercial companies prefer to avoid, such as quality and long-term reliability. ++L
Re: [9fans] Hardware recommandations for new CPU and file servers
> if it is affordable use diesel generators I have a UPS that won't sync with the generator, there are engineering excuses for this, but it's ridiculous that two expensive pieces of equipment can't cooperate to solve the problem they are designed to address. It's that type of absurdity that makes me think progress has lost the plot. ++L
Re: [9fans] Fossil disk usage over 100%?
In article <20130603202129.ga84...@intma.in>, kh...@intma.in says... > > On Mon, Jun 03, 2013 at 03:41:39PM -0400, erik quanstrom wrote: > > which is to say that the thesis that fossil sucks is refuted. > > > > - erik > > *now* I know what you guys meant by 'snarky comments.' > > "Just the place for some Snark!" the 9fan cried, > As he landed his Apples with care; > Supporting each mac on the top of the tide > By a lanyard tied off to his Air. > > "Just the place for some Snark! I have said it twice: > That alone should encourage the macs. > Just the place for some Snark! I have said it thrice: > What I tell you three times is true." > (much awesomeness snipped) "The Hunting of the Fossil" FTW !! Well done! =Aaron
Re: [9fans] Hardware recommandations for new CPU and file servers
> For something low power you can use an external power brick and a "picoPSU" > DC-DC converter with 12V in and 5V + 12V out with appropriate connectors. Yes - I use picoPSU with both atom and core i5 (low-power 2500T model), and find them very reliable. Besides being fanless they take up hardly any space in a small case.
Re: [9fans] Hardware recommandations for new CPU and file servers
I just use old thinkpads from the scrapyard. schrotti is an old x20 with broken screen, connected is one sata hdd via pcmcia. The main file server is an x60 with docking station and pcmcia sata card, together this gives me 4 sata ports. You just need the right cables (ebay china). In terms of webscale there is no power shortage or anything as I have more thinkpad power converters than light switches. batteries hold longer than 1 hour, so i don't need special gear. You just have to plug-in more thinkpads, enable pxe-boot in bios and off you go. 12TB is easy with 4*3TB drives Some friends have my backups in their living rooms so they can listen to my music or watch my films. Of course there is no need for enterprise-class magnets or jet engines. Redundancy gets created by creating more demand for my data. On 6/6/13, Richard Miller <9f...@hamnavoe.com> wrote: >> For something low power you can use an external power brick and a >> "picoPSU" DC-DC converter with 12V in and 5V + 12V out with appropriate >> connectors. > > Yes - I use picoPSU with both atom and core i5 (low-power 2500T model), > and find them very reliable. Besides being fanless they take up hardly > any space in a small case. > > >
[9fans] 9n
Hi, I have copied at sources.lsub.org/9n a copy of a modified plan 9 kernel that has a new mount table and mount driver, (everything near namec changed), along with a variant of fossil that speaks 9P2000.ix aka 9pix. See 9n.README for the details. It's experimental, so use with caution. I'm using it at my terminal but it's too young to be reliable. I also copied at 9nbits in the same server a few files that might be needed (the new kernel has a new OBEHIND open flag to enable write behind for files and thus has a new fdflush syscall). At http://lsub.org/export/9pix.pdf you have a TR describing the changes made. We also have a nix mark II that has these and other changes, and it's likely we will make it public at the old lsub nix site, but we are still changing it and fixing bugs there, so don't hold your breath. Besides this, the new nix has a new scheduler and a new memory manager. If anyone gives a try to any of this, and finds out any problem, please, concat us off list and we'll try to help. Our main tree has quite a few changes and it's likely I forgot to copy some bit or made some other mistake :) enjoy.
Re: [9fans] 9n
On Jun 6, 2013, at 7:40 PM, Francisco J Ballesteros wrote: > concat > us Since concat'ing us may be disgusting, I should have written "contact us". sorry.
