greg freemyer tlvognmhkkorgmailcom thu feb 14 2008 959 randall r schulz wrote thursday 14 february 2008 0618 greg freemyer wrote per dont know measured load important measure short power surges particular im suspicious load raid1 resync could technique catch 10 msec spike etc surely capacitors power supply elsewhere would absorb brief demand spikes source logic circuits active transiently voice coil obviously spindle motors uniform demand drive spun much higher starting course im guessing disk seek activity seek activity getting faster faster takes power startstop heads skip around drive apparently dont solid psu sata drive starts encountering problems trouble theory would hoped drive motors etc would 12v electronics 5v really dont understand issue happens either especially since disk seeks order 1 2 millisecs relatively small cap handle fine go back reread one posts tejun heo said issue 12v supply new video cards sucking 12v power regardless reports seen 4 drives especially raid 5 seems actively one drive causing problems drives sharing psu lkmlide list first troubleshooting question type issue power drives separate psu saw one lead developers say 90 reported problems currently caused power issues kernel code want experiment using cheap external psu httpmodtowncoukmtarticle2phpidpsumod fyi sata apparently ground cable dont worry ground loops repeating ive read lkml list check curious greg greg freemyer litigation triage solutions specialist httpwwwlinkedincomingregfreemyer first 99 days litigation white paper httpwwwnorcrossgroupcomformswhitepapers9920days20whitepaperpdf norcross group intersection evidence technology httpwwwnorcrossgroupcom tue 05 aug 2008 194957 0500 opensuse ot much power pc really consume