On 2013-07-19 1:01 PM, John R Pierce wrote: > On 7/19/2013 5:51 AM, Darr247 wrote: >> On 2013-07-19 3:54 AM, Gordon Messmer wrote: >>>> Regardless of your storage, your system should be powered by a >>>> monitored UPS. Verify that it works, and the drive's cache shouldn't >>>> be a major concern. >> It should also be a 'true sine wave' output when running on battery. >> Many UPS units output a 'stepped approximation' (typically pulse width >> modulation), which some computer power supplies may not like. > virtually all PC and server power supplies now days are 'switchers', and > could care less what the input wave form looks like. they full wave > rectify the input voltage to DC, then chop it at 200Khz or so and run it > through a toroidal transformer to generate the various DC voltages. > > Heh... go ahead and use stepped approximation UPS's then. What do I know; I'm just a dumb electrician. _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos