If that were true, esx would not scale at all. Given good hardware you can achieve much more than that. I have had upwards of 12 vm's (one exchange and one sql) running on a 4 disc R10 array with fast SAS drives. It wasn't as fast as bare metal but adequate.
jlc -----Original Message----- From: Charlie Kaiser [mailto:[email protected]] Sent: Friday, May 22, 2009 12:08 PM To: NT System Admin Issues Subject: RE: Performance problem on VMwareServer2 - gah How are the physical drives configured? We usually put no more than one VM on a spindle. The conflicts between two VMs on one spindle produce unacceptable bottlenecks in my experience. *********************** Charlie Kaiser [email protected] Kingman, AZ *********************** > -----Original Message----- > From: [email protected] [mailto:[email protected]] > Sent: Friday, May 22, 2009 10:49 AM > To: NT System Admin Issues > Subject: Performance problem on VMwareServer2 - gah > > Thought I'd ask our resident gurus... > > I have a brand new HP DL360 server. 8GB memory, 2 quads, 3 > SAS drives with a P400i/512 controller w/BBWC. > > I am running Windows 2003 R2 Enterpise on the host machine. I > also created > (4) VMs (each 75GB in size, preallocated) each with a Single > vCPU, and 2GB of memory, running Windows 2003 R2 Enterprise. > NOTE -- These VMs have NOTHING on them except the O/S. No > applications, no nothing. > > I have serious performance problems as it relates to the VMs > becoming unusable for a periond of 15 minutes or so every now > and then.... I am noticing, on the HOST, that the logical > disk - % write time performance counter just shoots up 100% > for as much as 10-15 minutes (see attachment > diskusage1.jpg) and then slowly comes down back to near zero > (see attachment diskusage2.jpg). The graphs show a total time > duration of 16 minutes - FYI... > > During this high spike of Disk Write % on the host, the VMs > themselves are doing NOTHING. Again, they are PLAIN OS > installed with nothing installed. > Performance monitoring on those VMs shows barely ANY > activiate at all, while the host shows 100% disk write %. So > it's definitely the host, it seems, causing the poor > performance. Also, notice in Attachment diskusage2.jpg the > slow decline of Disk Write %... This ALWAYS happens after a > period of 100% disk write % usage.... it trails off slowly > like that over a 10-15 minute period before it come down to > zero again. > > Any idea what is causing this? I'm thinking about giving up > and going to ESXi. ?? > > picture1 - > http://communities.vmware.com/servlet/JiveServlet/download/126 > 0005-23055/dis > kusage1.jpg?tstart=0 > > picture2- > http://communities.vmware.com/servlet/JiveServlet/download/126 > 0005-23054/dis > kusage2.jpg?tstart=0 > > Thanks all! > > Remember the true meaning of Memorial Day! > JR > > > -------------------------------------------------------------------- > mail2web.com - Enhanced email for the mobile individual based > on MicrosoftR Exchange - > http://link.mail2web.com/Personal/EnhancedEmail > > > > ~ Finally, powerful endpoint security that ISN'T a resource > hog! ~ ~ > <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
