Just recalled another issue where a Dell I ran into had a marginal hard drive on a Perc controlled RAID system. The drive hadn't been failed by the controller, but the system resources were sufficiently throttled that it caused extraordinary system lag across the entire host that guests lagged as well, and the symptoms presented on the guests was that they were using a lot of memory. I don't recall all of the details, and sadly my notes on the issue are with my former employer. I do recall that a reboot on the host caused the Perc controller to actually fail the drive, and the memory issues persisted until the drive was replaced and the RAID was rebuilt.
On Thu, Apr 27, 2017 at 12:08 PM, Heaton, Joseph@Wildlife < joseph.hea...@wildlife.ca.gov> wrote: > No. there are only 44GB assigned to guests, out of 64GB total. > > > > *From:* listsad...@lists.myitforum.com [mailto:listsadmin@lists. > myitforum.com] *On Behalf Of *Jonathan Link > *Sent:* Thursday, April 27, 2017 8:46 AM > *To:* ntsysadm@lists.myitforum.com > *Subject:* Re: [NTSysADM] Strange memory issue on a DC > > > > Is the host's memory over-subscribed by all of the guests? > > > > On Thu, Apr 27, 2017 at 10:11 AM, Heaton, Joseph@Wildlife < > joseph.hea...@wildlife.ca.gov> wrote: > > This DC is 2012R2. It is a VMWare guest. It has been running at 95%+ > memory utilization. I’m not sure for how long, but I happened to see an > alarm for CPU utilization on the guest when I was in vCenter yesterday > afternoon. When I RDP into the domain controller, it is very slow to > login. I open Task Manager, and on the Performance tab, Memory is at 98%, > and steady. I look at the Processes tab, and the memory shown as used > doesn’t add up. There are lots of processes using memory, but the largest > user is using around 100MB. The box has 4GB assigned. Looking at the > Details tab doesn’t shed any more light on the issue. So, our first > thought is some kind of memory leak, so we schedule and perform a reboot > last night. As soon as the box comes back up, I log in, and memory is > right back at 98%. I compare with a couple other DCs, and one of those has > around the same number of processes running, but its highest user is right > around 1GB, and its overall usage is around 60%. What other tools can I > use to help figure out where that memory is going? > > > > Thanks, > > > > Joe Heaton > > Information Technology Operations Branch > > Data and Technology Division > > CA Department of Fish and Wildlife > > 1700 9th Street, 3rd Floor > > Sacramento, CA 95811 > > Desk: (916) 323-1284 > > > > Every Californian should conserve water. Find out how at: > > SaveOurWater.com <http://saveourwater.com/> · Drought.CA.gov > <http://drought.ca.gov/> > > > > >
