March 25, 201313 yr I am the perfect case study... I am running unRAID 5RC12a as a VM on ESXi v5.1. The hardware is as follows: MB: From a Lenovo ThinkStation D20 PSU: Same as above...I think it is 1Kw CPU: 2x Xeon E5530 (1 CPU - 1 Core dedicated to unRAID) Memory: 20GB DR3 1066 ECC (3GB dedicated to unRAID) Controllers: 2x AOC-SASLP-MV8 HDs: 3x 128GB Kingston SSDNow v100 8x 2TB drives...6 data, parity and cache Case: Norco RPC-4220 So, anyone who owns a Norco 4220 or 4224 are well aware of the 2 rear 80mm fans and how much air they push (not to mention how loud they are). Here is my issue... If I have those fans connected to one of the main feeds from the PSU via 4pin molex (which is the same feed that goes to the backplanes), my parity checks start out @ 130MB/s. After about two minutes, it has gone down to about 30MB/s and keeps going down. If I disconnect the fans, parity check starts @ 130MB/s and levels off to about 105MB/s and stays there. If I use 2 different fans (not nearly as powerful) that plug into the MB, parity check starts @ 130MB/s and levels off to about 105MB/s and stays there. Is there something wrong with the chassis fans that the 4220 comes with? Is it bad having the power for them inline with the power for the backplanes? FYI...I can replicate all 3 scenarios and results at will. John
March 25, 201313 yr I would first check how you have the data cables ran. Are they parallel with the power cables? Grouped together? If so run change the cable runs a little and see if it improves. I think it was Joe L that has a post in a thread talking about this, but I can't seem to find it right now.
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