SGI....

[Sebastian Brückner]

Sridhar Ayengar schrieb:
> Sebastian Brückner wrote:
>> I know that those machines are supposed to run continuously but it 
>> can't be quite normal that every other time I power it up one of the 
>> supplies dies. Any hints? Is there a way to fix those things or to 
>> prevent them from blowing up altogether?
> 
> Are you sure that you've wired your premises electrics correctly?  That 
> could cause power supplies to keep blowing.

Well... that could be the cause. I'm running the machine off a 16A fuse 
although it is designed for 25A IIRC.
Of course the fuse could blow on power up but I didn't expect that to do 
any damage to the power supplies... maybe that was a very bad idea(tm)?

> Do you have enough power supplies for the boards and other options you 
> have installed in the system?  That could be doing it too.  Or if you 
> had a boardset with an unfused short in it or something, although I 
> would think there's probably fuses in the backplane or something.

After losing supplies with the original configuration (24 CPUs, ~18 SCSI 
channels, 1.5GB RAM) I stripped the machine to a fairly minimal 
configuration (something like 4 cpus, 512mb ram, no extra scsi). The 
problem didn't go away.

Once it boots (and doesn't blow as soon as I turn it on) it runs without 
problems. And since it worked in that exact configuration for years for 
the previous owner (continuously powered on though) I expect it to be 
fully working. He also said that he often had to replace the power 
supplies after power cuts, so it might just be normal...

Sebastian