The host memory usage

Similar Questions

• Questions on the host memory usage

  I was wondering if someone could give some insight on the following situation. We vSphere host set upwards with 32 GB of RAM. On this, we have 10 VMware View desktops and a couple Server VMs. We have configured each in order to have 2 GB of RAM. The host is showing an alarm for the host memory usage, but if you look at each of the virtual machines Windows XP, memory is granted way superior to the active memory. We have no reserve set and actions are set to normal. I wonder why the system reports a memory constraint when the largest part of the memory is alocating is not active.  In addition, the shared memory is showing 0. So this means that the memory page sharing does not locate? Am I missing something?

  ESX has called fresh General.  A virtual machine has 2 ways to manage memory.  a physical machine has one, physical RAM, and when this physical RAM disappeared, the operating system is left with only one option, Exchange.

  VM works the same way.  A material divides the virtual machine into small sections, only they have hard limits.  So your VM is 2G, the operating system and virtual machine sees only 2 GB of RAM.  When this RAM was gone, the operating system must decide where the extra RAM is come.  Since it is a Vritual machine, the RAM of the machine can ALSO be swapped.

  So, when you create a virtual machine, and you do not have reservations, you say that the Virtual Machine to get the RAM of the host, if this fails, get from a pagefile on the RAM disk.  If not THEN the operating system can use internal swap, but ESX requires a virtual machine to use his 'balloon' driver to lead you to the top of RAM internal and fool the operating system into thinking that he MUST use internal swap. It is probably where you are confused.

  The use of the RAM that you see is the virtual machine, taking all THE RAM of the host.  If the host has say 48GB of RAM, and you have the run of the 10 mV, which is more than 20 GB of RAM in use.  There is a LOT of RAM left other virtual machines, so in this case, the memory of the host is high (use), but not ACTIVE, which means allocated for the virtual machine, but the OS is not really 'use' for the moment.

  When you add multiple virtual machines, you will see this fall.  Keep in mind they can really share the memory too, so among those 20 VM with VM similar (like Windows), they are all windows (suggests) and 30% of that share these 20 VM, so 30% 20 GB is 7 GB, so 13 GB that is actually used, so in a perfect world, ideal conditions your host should be about 15 GB used probably less active 6 GB, but EACH VM shows 2 GB of memory host, right?

  It's normal.  When one approaches the limit of host memory that these figures will change, from OS and need and that the BONE... and to complicate things even more, reservations and VM limits and priority will ALSO skew the numbers.

  Isn't fun ESX?

• Relationship between memory of comments and the host memory usage

  Hello

  I noticed today that the memory usage of my cluster rose close to 90% in all of the blades. I checked and found that a number of virtual machines is everyone using over 3 GB of memory host. When I went in the performance monitor for each of these virtual machines, they used only a maximum of 400 MB.

  How the memory usage of comments relate to the host memory usage, and how I can reduce the amount of memory used host so I do not have a performance hit through the cluster?

  Running ESX 3.0.2, VC 2.0.2 Dell Poweredge servers with 2 processors 1.86 GHz quad core and 24 GB of RAM.

  See you soon

  Graeme

  You can learn more about memory usage http://www.vmware.com/pdf/esx3_memory.pdf and resource management guide http://www.vmware.com/pdf/vi3_35/esx_3/r35u2/vi3_35_25_u2_resource_mgmt.pdf

  If you found this information useful, please consider awarding points to 'Correct' or 'useful '. Thank you!!!

  Kind regards

  Stefan Nguyen

  VMware vExpert 2009

  iGeek Systems Inc.

  VMware, Citrix, Microsoft Consultant

• Do not allow the virtual machine to power on if the host memory usage over 75%?

  Hi all

  I'm looking for a way to do not allow the power of virtual machines on if the clutser average memory usage is greater than 75%, or if its corresponding host memory usage is greater than 75%.

  Any idea.

  Thank you very much

  Hey Valot,.

  One way to achieve this is HA admission control that does not allow a virtual machine to be turned on if the availability constraints are not met

  http://www.VMware.com/PDF/vmware_ha_wp.PDF

  Also chwck on http://www.yellow-bricks.com

  Concerning

  one

• Linked Clone - host memory usage

  Hello

  I have 2 separate infrastructure spacing to air both view currently running 4.0.1 with XP SP3 clients.

  Infrastructure 1

  • the host is HP DL380 G5 - 32 GB of RAM. (ESX 4.0 U1)

  • clones linked XP run at the host 400 MB average memory usage by linked clone

  Infrastructure 2

  • the hosts are 2 x HP DL380 G6 - 60 GB of RAM. (ESX 4.0 U1)

  • clones XP related work to the host 1035 MB average memory usage by linked clone

  These XP images are of the same generation, but on the more powerful G6 hosts, they run twice the host memory, which is make my ability to activate HA on this cluster.

  Does anyone know why these linked clones could be chewing so much more memory host? Half of them are not yet recorded.

  The cpu:s in the G6 is probably using "Main Pages", then the TPS will not take effect until the memory starts to be overcommited

  If this is the reason why there is no need to be worried, you can try to disable the support of large Pages by changing the following setting:

  Goto, dialog advanced settings, choose Mem. Mem.AllocGuestLargePage the value 0

  More about it in this thread:

  http://communities.VMware.com/thread/211585?start=0&TSTART=0

  Best regards

  Linjo

  If you find this information useful, please give points to "correct" or "useful".

• How can I check the JVM memory usage?

  Hi all
  
  I had a number of applications that run in Weblogic running in the same JVM. Is there a way to monitor the memory usage of the JVM heap for a particular application?
  
  If I do

  ps -ef | grep java

  I can see the process, but how can I check the FMV of each of the applications memory usage? Thank you very much.

  No Linux command will be made available within a JAVA virtual machine running an application server and understand how much his memory belongs to a specific web - app.

• The host memory, comments and memory

  I'm the stage of tests to understand how RAM is run on a host ESXi 5.x.

  I have create a new Windows Server 2008 R2 with 16 GB of RAM and installed VM.

  The virtual machine is running wit a logged-on user and no activity.

  vSphere client reports Host MEM - MB as 11325 (why not 16000?) and guest mem % 53% (decreasing very sloowly).

  Reports of Windows task manager memory is 1 GB.

  How can I read these data?

  What is the amount of RAM that is really used?

  How can I change the data in vSphere client, as the old good F5 produced no visible results?

  Concerning

  Marius

  Hi guy,

  If the host is not constrained memory, when you turn the virtual computer, assign the needs of memory from the operating system. Then, the memory is not recovered because it didn't claim to host you.

  I don't know why you see only 11000GB... can you give us screen printing, for this virtual machine, "resources Alocation"?

  Installed Vmware tools in the virtual machine?

  When you host is limited, so act balooning and the memory of the host for this computer virtual will decrease.

  Kind regards

  Leandro.

• Windows 2008 using all the it is assigned the host memory

  Hi all

  We have just started using ESX 4. Using the Update Manager I applied update 1 and all patches.

  I installed a couple of servers, most of them are windows 2003. However, I installed a windows 2008 machine and awarded 8 GB of memory.

  As you can see in the screenshot the guest uses very little, but still it shows that it uses 8 GB memory of the host.

  We had this same behavior with an earlier version of ESXi 4, but that is resolved now. (I don't know how, but I guess that through patch).

  There is not much to find on this, but I can't imagine I'm the only one, or I'm doing something wrong (also not entirely unlikely )

  Someone at - it ideas?

  This is an expected behavior of Windows from 6.0 (Vista / 2008).  See this article on Superfetch.

  Virtualization of happy!

  JP

  Please consider awarding points for correct or helpful answers

• the 50% memory usage and no vm

  Hello

  I recently bought two Dell r900 servers ESXi 3.5.0 build 111522 preinstalled.

  When I first started the serversm and them managed directly through the VI

  customer. I noticed something strange. The VI client said about 50%

  memory usage with absolutely no virtual machine running on the server. I have

  proceededto add servers to my vcserver. But vcserver also reports

  50% use of memory with nothing else running on the server.

  Screenshot:

  

  Specifications of the server: Dell PowerEdge r900 6 x Intel Xeon E7450 processor and controller @ 2, 40Ghz with 128 GB of memory. Does anyone know what causes this problem?

  Does anyone know what causes this problem?

  Concerning

  Nils Andreas Myhre

  Welcome to the VMware community forums.   See if this thread helps -http://communities.vmware.com/thread/128055.

• Check if the Oracle memory usage is critical

  Hi all

  I'm in Oracle Database 11 g Enterprise Edition Release 11.1.0.7.0 and I would like to know how if it is possible to detect any evidence that Oracle may encounter a problem of memory.

  I know how to get STATS$ SGASTAT and STATS$ PGASTAT for historical data from V$ SGASTAT and V$ PGASTAT respectively.

  But is there a calculation can be done and may indicate that Oracle is currently at a stage of critical memory use? Or any other given I can check (with the exception of newspapers) which could indicate such a thing?

  
  

  Thanks in advance.
  

  A symptom peut be continued use memory increase, once the database has been restarted, although there is no extraordinary use. This can be a problem that occurs in seconds, minutes, days, weeks, months or even years. Of course, if it takes some time, the problem is less a problem.

  More important is: measure, one of these functions underestimated in this DOCUMENT, plus monitoring does not even basic OK stuff, or more in depth things.

• Memory usage (%) vs. free memory (%)

  Hello
  
  Why is - this grid control has 2 parameters to measure the host memory usage? What is the difference?
  should I have them both? :/

  user9182826 wrote:

  rp0428 wrote:
  You have not yet provided the information request
  >
  Be more specific on what you look at.
  >
  What measures are you talking about and what is the reference of the doc for them you use?

  grid has 2 parameters that are a bit confused, 1 use of memory (%) and 2 of free memory (%), if we shouldn't be sufficient? I dnt undretsand the need for these two. maybe im missing the point

  Thank you

  for many or most * systems NIX running Oracle RDBMS, the operating system to work normally with less than 5% free RAM; regardless of the total RAM.

• Host memory consumption is higher than the comments its use (incl. Cached) and overhead?

  I'm under ESXi 5.1. I don't have any custom reserve configured for memory. I'm running in CVS 'Sandy Bridge' mode.

  I noticed earlier than expected host memory consumed on many of my guests. This example comments running Server R2 2012 with the latest version of VMware tools running.

  VMware reports

  

  The guest operating system reports

  

  My understanding is that the "Standby" and "Modified" on the client contains the ' cache ', and the 'Cached' memory prompt is the typical response to this question that I see when people seek only to the memory of 'In Use'. In my case, I'm factoring in the memory cache, my guest shows 3805 MB of real memory, yet my host shows 7.68 GB of memory consumed host, with only 68 MB of general consumption. According to my calculations, the virtual machine should be only consume about 4.28 GB of memory.

  Post edited by: bradduane Replace the values of text with screenshots.

  I think I found my answer in the guide 'Understanding memory resources management' here: http://www.vmware.com/files/pdf/mem_mgmt_perf_vsphere5.pdf

  Section "when to retrieve memory host" page 15:

  «In the high State, the use of global memory machine virtual comments is smaller than the size of the host memory.» Whether or not the host memory is overcommitted, the hypervisor will not recover memory via hot-air balloon or permutation. (It is true that when the limit memory VM is not set).

  If memory free host down to the low threshold, the hypervisor begins to find the memory using the balloon. Balloon happens before free memory has actually reached the soft threshold because it takes time for the balloon pilot to allocate and PIN memory physics reviews. Usually, the balloon pilot is able to retrieve the memory in a timely order to keep free memory in the host above the soft line. »

  I checked esxtop, pressing "m" for the display of the memory, and I see that hosts VMKMEM shows 'State', so the only memory of way either currently retrieved is by sharing the page. Only when I start to run out of memory of the host, that this State becomes 'soft' or 'hard', balloon or Exchange will be held in order to free the "free" memory of comments. ESXTOP show my 'minfree"than 940 MB, while it shows that I physically 6960MB of free memory.

• Memory of the host indicated in vCOPS v vCenter

  Hello

  One of the things that I find vCOPS is that a lot of things I thought I knew now goes out the window.

  Before vCOPS, we relied on vCenter and when the host started to use memory 80 or 85% report that it was time to add more RAM.
  It seemed that many people use this figure as a reference point.

  vCenter reports now that my guests are sitting at 90 and I get the occasional alarm.
  Normally I would have placed an order and more material. I have this presentation vCOPS VMware which tells me that some said vCenter is accurate.

  vCOPS says (under Details > workload) that my workload memory resembles 32%.

  Memory | Use meter displays the host memory as is vCenter but memory | demand is actually 32% of and this is the number I need.

  On the one hand, it's cool that everything is green in vCops, on the other hand, I'm nervous because fibrotic vCenter.

  I have to start ignoring vCenter, now that I have vCOPS running?

  
  See you soon

  Well, I said that the issue of memory management is complicated.   We try to make easy to use Ops vC, but obviously some of the complications come through.

  In any case, Yes, I think that it's ok to ignore what tells VC.  Since you are always run things a certain way according to VC, it is probably better to start overcommitting slowly.  (Evolutionary change is always better than revolutionary.)  But the general response is that Yes, VC alerts are generally much too conservative and aren't really take a variety of performance data into account.

• confused about the available memory after upgrade to ESXi 5.1

  Hi noobie question here

  After an upgrade to ESXi5.1 (wiped ESXi5.0 and installed fresh and imported 5.1 2 s previous VM), I can start is more two virtual machines when they use the 3 GB of RAM each. In ESXi5.0, it worked.

  I need to reduce 2.6 GB RAM for each virtual computer. The only thing that I see is this "total capacity" is 5.7 GB while the system has 8 GB of RAM. Please see the attached picture (I don't know what 'Full capacity' read in ESXi5.0, so I can't compare)

  I understand ESXi5.1 needs some overhead and that each VM needs some overhead, but I have yet an another 1.5 GB of RAM available for my VMs.

  8185 (ability)

  -2660-2640 (two machines)

  -231-194 (overhead for 2 virtual machines)

  = 2460

  Does this mean that ESXi5.1 uses 2.4 GB of RAM to run 2 virtual machines? The photo shows 984MB in use without the virtual machines are started. So start-2 VMs cause ESXi5.1 use 1.4 GB more RAM?

  If so, what form that would show? I am sure that it is me who is missing something, but please explain.

  Thank you

  Well Yes... somewhere down the line, the ESXi5.1 host memory usage was doped up to ~ 2 GB. In my system 32 GB, I use only 26 GB

  But even once, there are a few tweaks to release some 500MB in the configuration of the distribution of system resources tab. You can have a shot at him. But I wouldn't recommend it.

• Memory usage

  We have a few GSM7228 and 5300 network (successful) on LAN switches. All switches has 90% or more of average use memory permanently.

  The network works fine, but we are curious to know the high memory usage. Average CPU usage is less than 10%, response time is great & packet loss is 0%.

  Any idea what could cause high memory usage? Thank you.

  Thanks for the reply. The version of the installed firmware is 10.0.0.53.