On Mon, 2006-05-01 at 13:22, Tom Arthurs wrote: > UPS does not protect against the tech behind the rack unplugging the > power cable, or an accidental power cycle from exercising the wrong > switch. :) Both are probably more common causes of failure than a total > power outage. > > Erik Myllymaki wrote: > > I have been in discussion with 3ware support and after adjusting some > > settings, the 3ware card in RAID 1 gets better performance than the > > single drive. I guess this had everything to do with the write (and > > maybe read?) cache. > > > > Of course now i am in a dangerous situation - using volatile write > > cache without a BBU. > > > > If I were to use a UPS to ensure a soft shutdown in the event of power > > loss, am I somewhat as safe as if I were to purchase a BBU for this > > RAID card? Nor does it prevent an electrician from dropping a tiny piece of wire into a power conditioner, causing a feedback that blows the other two power conditioners, all three industrial UPSes, and the switch that allows the Diesal generator to take over. When that happened to me, I had the only database server in the company to come back up 100% in tact. You can guess by now I also had the only database server with battery backed cache...
