normal as long as spinning low rpms
Yep, they are. Just checking.
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normal as long as spinning low rpms
I can confirm that the backplane you are using (SuperMicro SAS2-846E1) does, indeed, dual-link with LSI controllers. I have tested with 9201-8i, 9211-8i, 9205-4i4e, 9207-8i and IBM M1015 flashed to LSI firmware.
In theory, since the Supermicro backplane is built using an LSI SAS2x36 chip - which fully supports dual-linking - you should be successful with any SAS Raid or HBA that also supports dual linking. Certainly anything based on the LSI 2x08 or 3x08 should be safe.
I think you have to pull it out, you should be able to pull it out just a little so you don't have a gaping hole in the back though.
I think you have to pull it out, you should be able to pull it out just a little so you don't have a gaping hole in the back though.
I tried that, but it still alarms.
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.
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.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
I've always wondered why people keep removing the 2nd PSU in home use. Does it drain extra watts or what?
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.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.
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!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
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.
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)The order doesn't matter, the ports are not explicitly defined.
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*
Currently using the 846EL1 backplane, and have a spare 846TQ backplane (direct attached). Was wondering if anyone has experience with both, and if there really is a gap in performance, especially if all 24 bays are populated?