Sun Power Supplies
Can any one help with this technical query?
On a Sun V880 there are 3 power supplies (PSU0, PSU1 and PSU2) Only 2 are required for normal running with the 3rd for redundancy.
On our site all three power supplies are connected to a mains outlet supply.
One of the PSU is connected to a supply with no mains backup supply while the other two are fed from a supply with battery backup.
Is there a way to find out which 2 out of 3 supplies are being use to power the box and which is the redundant switch over supply. All three appear to be drawn load.
If they switch over from say PSU 0, 1 to PSU 1, 2 during a fault condition, is there a way, once fault is removed to get then Sun box to manually switch back to using the original two PSU抯
Have search the web but having difficulty finding anything relating to this.
[864 byte] By [
inge] at [2007-11-25 23:35:00]
# 1
You wrote "All three appear to be drawn load." You are correct
according to Site Planning Guide, page 36 (PDF 52 0f 68):
http://sunsolve.sun.com/data/816/816-1613/pdf/816-1613-15.pdf
"In a 2+1 configuration (that is, three power supplies are installed, with two power supplies delivering enough power for the entire system), all three power supplies are turned on and are delivering power. Each supply delivers approximately 33% of the power needed by the system. If one supply fails, the supplies that are still online will each provide 50% of the power needed to keep the system running."
They don't switch. 3 good supplies share the load as seen in prtdiag -v. Pull a power cord on your test/lab system and watch load go up on remaining 2 good supplies. Plug it back in and watch all 3 resume sharing total load.
