Yep, they are. Just checking.
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New Supermicro 24-bay Chassis - Help setting up
- Thread starter eptesicus
- Start date
Yep, they are. Just checking.
Besides one cable going to the uplink port on the backplane were does the second one go? The other two are for cascading and duplication I thought
cp_kirkley
Limp Gawd
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Thats what she said.
pull out one of your PSU. only put one in the slot (bottom or top does not matter).
you can leave it empy or make asimple cover from plastic. yes hard plastic not cardboard.
Not that I've noticed, and I'm basing that off of my UPS. I only removed the 2nd PSU because of the fan noise. I tried unplugging one of the fans, but the machine wouldn't boot. Which, I'd say is a nice feature, but these things are too loud. Granted, it's my own fault for using a server chassis at home, but I gotta try and find out how to quiet the noise of the PSU fans.
what is you psu model number?
I know 501P that I have is kind of quite with humming noise for the fan
I think 501P(platiunum) and 920P(platiunm) has only one fan.
1k2p (gold)has two fans
but all runngin with low rpms...
I have 501P and 1k2P that only one psu installed
I have two PWS-1K21P-1Rs. I'm keeping an eye out for the 920s on ebay.
ask SyC to sell one for you
do you on ebay? I saw one last week , the price was ~$70+$16 shipping. kind of pricey
if you want to rip-off supermicro PSU in the case, this is easy..
you can replace with regular Desktop PSU (get a good one, I trust seasonic gold/platiunum PSU). I did this on old model of SM, before knowing newer PWM PSU is not a jet engine noise.
if you need to make pretty quite, I can take a picure of my old 4U supermicro.
TeeJayHoward
Limpness Supreme
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- Feb 8, 2005
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One in, two out. That's how I look at it. On the SC846's we have here at work, one cable connects to the HBA. The other two connect to a SFF-8087-to-SFF-8088 converter card, which then connects to an external JBOD like this. On the "E26" chassis backplanes, you've got 2 in, four out.
Because they are pointless most of the time. Dual PSU is for redundancy not just from a PSU dying but a circuit going down as well. So they are mainly used for PSU1 going to battery backup A and Circuit A. While PSU2 goes to battery backup B and circuit B.
Then they can also drain extra power. When you have say a platinum PSU They are only rated between certain amounts of draw. Usually above 50% so if you have two PSU's and each is at 25% your efficiency went down and a single PSU would operate at a lower cost. Then you have added heat/cooling to it as well.
Right, that's what the manual tells you, but the expander is an LSI SAS2X36, which supports dual-linking for extra bandwidth. I'm not sure why SuperMicro doesn't put this in the manual... probably to get people to buy the E26 variants.
The order doesn't matter, the ports are not explicitly defined. Any two can be used for uplink, leaving the last one for daisy chaining. I have an IBM M1015 (flashed to 9211-8i IT) connected to both the uplink and the 8087 directly to the left of the uplink (when looking at the backplane from the back) and it works just fine!
Exactly, I think if you have 2 PSUs, it will balance the load between them, reducing efficiency if you have a low workload. But more (most) importantly in a home environment, the fan noise is reduced.
TeeJayHoward
Limpness Supreme
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Huh. Didn't know that. Sure enough, the Supermicro manual lists only the rightmost port as being for the HBA. (Appendix E, page E-13 of the SC846 manual linked)
They really need to update that if dual-linking works. *shakes fist*
No. They really don't need to update anything.
Remember that they consider what you are doing an unsupported use. It will work - but if they update their manual to document it then they are somewhat on the hook to answer questions about it and test it and maintain it through their support organization. They really don't want to do that (and, frankly, you don't really want them to do it either - longer argument than I want to type here). That's why their manual is a bit thin. They document only the parts that they intend to support.
Its a bit like racing your car. You can put fat tires on it or make more intrusive racing mods, but don't expect Ford to help you do it. Don't expect to find the "if you want to race this car" section of the owners manual. You've got to do your own homework and become a "car guy" if you want to make mods.
Same here. You've got to take the time to research and learn how it really works inside if you want to make application that the manufacturer did not intend. So in this case - go read about the LSI SAS2x36 expander chip used inside the backplane and get to that "aha!" moment for yourself when you really understand.
Assuming you've got the SAS2 EL1 and not the SAS1 EL1. If you've got the SAS1 backplane quickly find a trashcan for it and install the TQ. Otherwise, it depends entirely on what you are filling the drive bays with and what you are connecting them to.
If you are filling the drive bays with consumer SATA drives and connecting it to a good HBA (LSI 2008/2108 based) then no, you probably won't notice a difference, even if you are using the TQ backplane and multiple HBAs.
If you are using 15k SAS drives you might notice - but probably not.
If you are using the direct attached (TQ) backplane but then connecting through an expander to get the 24 drives exposed to your HBA then you've just re-created the thing you got with the expander backplane. They are equiv. configs and you'll see no difference.
If you are using all SSD and connecting to multiple HBAs to get the 24 drives exposed then yes - you'll notice a large difference in performance using the direct attached method.