Mark Hahn <h...@mcmaster.ca> > I'm not overly fond of soprano choral works either, but they're not > _inherent_ to 1u-ism. I have some 1u's with centrifugal fans that are in > their, uh, probably 7th year of service. jeez.
Are these on the CPU heat sink or in the chassis? I am currently disassembling a rack which used these on the CPU: http://www.dynatron-corp.com/products/cpucooler/cpucooler_model.asp?id=86 These were horrifically load 1U units, and I had thought it was mostly because of the many itty bitty fans in the case. Apparently, they were not entirely at fault. One motherboard was recycled into a scavenged desktop case for use testing disks. That test system emits a piercing 6 KHz note which is unbearable without ear plugs. The fan is rated just below 50 dBa, but subjectively, it is painfully loud, as if it emits all of that sound energy in a very narrow frequency band. My impression is that these CPU fans were not especially reliable - I know the fellow who ran it had to replace several of them. (Possibly because things were a bit toasty inside the dual motherboard 1U cases.) Back to the original subject: is it my imagination or do none of the system vendors specify the L10 or MTBF ratings for the case and CPU fans they use? At least, I can never seem to find that info on vendor web sites. Buyers really should not have to tear down a test system, or specially request the information, in order to determine the expected component lifetimes. Yet case, PS, and CPU fans are the most likely things to fail in a server, with the disks bringing up a close second. Regards, David Mathog mat...@caltech.edu Manager, Sequence Analysis Facility, Biology Division, Caltech _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
