>> Lot of reported problems turn out to be power supplies not designed to >> carry a Sata load. Apparently sata drives are very demanding and many >> "good" power supplies don't cut the mustard. > > Well, the server itself only has a single PATA drive as its boot drive, and > the only peripheral card is the SATA controller. It's a new chassis (6 > months) with a 550 Watt supply, so it's unlikely to be the culprit, even > though the CPU is 125 Watts. The RAID chassis is a 12 slot system with a > 400 Watt supply and 11 drives. I suppose I could try changing the RAID > supply to a 600 or 700 watt model, but really 400W should be enough for 11 > drives and 3 port multipliers. According to the spec sheets, the most power > hungry drives in the mix (Hitachi E7K1000) require an absolute maximum of 26 > watts. If all the drives were the same, that would be 286 watts. > Especially given the Western Digital drives and the one Seagate (not part of > the array) drives are specified to have somewhat lower power consumption, > 400W should be fine. It may or may not be as simple as you describe. A lot of modern PSUs have multiple rails. Each rail is independent and provides some number of watts. So if your CPU / graphic rail(s) are getting 300 watts out of your 550, then that only leave 250. And that can be split among 2 or 3 rails as well. It definitely gets complicated. Or you may have a simple design where all the 5v lines are tied together, same for +12v,-12v. OTOH, if your having issues with power you should be seeing sata transmission errors reported in the kernel log. I don't recall your saying, but I assume you've been watching that and nothing is showing up during these events? Greg -- Greg Freemyer Head of EDD Tape Extraction and Processing team Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer First 99 Days Litigation White Paper - http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
