Brian Mathis wrote: > On Wed, Jan 5, 2011 at 9:47 AM, mcclnx mcc <mcclnx at yahoo.com.tw> wrote: >> we have several R900 servers with PERC 6/E card in it. Recently it we >> getting some message on /var/log/message say change to "write back" and >> change back to "write through". >> >> We figure out it is PERC 6/E card battery weak. My questions are: <snip> > > Please install and learn about the Dell Open Manage Monitoring tools, > and also read user guide for PERC/6 on Dell's web site. You seem to > be flying blind here and just guessing at what's going on. They have > a yum repository where you can "yum install" the software. Or go to the LSI website, and d/l MSM, and install that ("MegaRAID"), which gives you a nicer GUI than the one you get when you boot the system, and hit <ctrl-somethingorother> <snip> mark