On Thu, Jul 16, 2015 at 5:54 PM, Karel Gardas <gard...@gmail.com> wrote: > On Fri, Jul 17, 2015 at 12:15 AM, Paolo Aglialoro <paol...@gmail.com> wrote: >> Just a thought about technical feasibility of the whole operation: if such >> loud fan cooling is needed, this means there's a lot of heat generated. So, >> heat will be ur no 1 enemy. > > The heat produced is a side effect of consumed electricity. You do > have T1000 so you can measure how much it consumes, but I would guess > to be around 200W max. CPU is around 70-80W. So those are two 100W > light-bulbs or just middle-range PC. Do you need to produce that much > noise for cooling PC? IMHO not, the problem is with the size of the > fan, you need much bigger fans rotating much slowly yet pushing same > or more air. There will be a need to have kind of wind tunel around > CPU and perhaps also dimms. Drives should be ok like the remaining of > the board. Just a bit of moving air should be enough here. The size of > fan is also the reason behind the need to completely replace PSU. > You are probably right that the box will not boot or it'll switch off > shortly after power up due to missing fans. I think there exist some > trick(s) how to convince the board that the "atttached" fan are ok and > rotating at appropriate speed. I guess those are PWM fans, so this > should do the job: http://www.techidiots.net/notes/fake-fan-sensor -- > if those are not PWM, then the trick will be different, but still > possible IMHO.
The PSU of the T1000 uses '4-connector' fan, as far as I know - and I know very little after trying to hack into this PSU to make it's fan do less noise - the fourth connector is used for 'sending rotating speed', so I tried to make it do a lot less noise by under voltaging it, like all other fans in the T1000 (3 pin fans) but the PSU and the System Controller detects that the fan isn't rotating at the speed it told it to do and after three tries the PSU shuts down and _bricks_ itself, giving you a nice message in SC telling you to 'PSU: fan problem, replace FPU' - or something like that... >> U could go liquid cooling over the CPU, but what about the rest of the >> board? And what about the missing fans? Will the system turn on/run/boot? >> >> And, btw, just stick with original PSU, it's been DESIGNED for that board. > > That's the question. Is it really designed for the board? Or is it > just rebranded ATX PSU for 1U case? > I fix the heating problem by opening the case, putting a piece of paper in the chassis sensor and dedicating a 40cm diameter standing fan to cool my T1000... - having its integrated (except PSU) fans undervoltaged >> One last remark: this machine features neither USB nor optical drive > > No USB? Hmm, that means no keyboard nor mouse so no workstation but > still possible silent server. > You use serial to admin it... >> (although the creator of opensxce claims he could boot by directly >> attaching a sata DVD, I never succeeded in getting openbsd/solaris CD boot >> this way on my T1000), so it's either a netinstall box or you gotta rework >> the HD on some other sparc64 hw before (at least some bootloader plus >> bsd.rd on it). And before this also update OBP to latest possible >> version.... > > Netinstall should not be problem here. > > Thanks for the comments! > Karel >
