Brief, illustrated by the guest is smaller than the configured memory

Hello

We organize our virtual machines with the external supplier and asked us to set the virtual host (RHEL) 1024 MB

At the end of that this has been done, I logged the guest and/cat/meminfo showed less than:

cat/proc/meminfo

MemTotal: 896108 kB

MemFree: 18848 kB

Buffers: 304120 kB

Cache: 378700 kB

SwapCached: 0 kB

Active principles: 253004 kB

Inactive: 486740 kB

HighTotal: 0 kB

HighFree: 0 kB

LowTotal: 896108 kB

LowFree: 18848 kB

SwapTotal: 2097144 kB

SwapFree: 2097144 kB

Sale: 252 kB

Writeback: 0 kB

AnonPages: 56932 kB

Mapped: 14356 kB

Slab: 120860 kB

PageTables: 4008 kB

NFS_Unstable: 0 kB

Bounce: 0 kB

CommitLimit: 2545196 kB

Committed_AS: 149664 kB

VmallocTotal: 34359738367 kB

VmallocUsed: 1784 KB

VmallocChunk: 34359736183 kB

HugePages_Total: 0

HugePages_Free: 0

HugePages_Rsvd: 0

Hugepagesize: 2048 kB

I asked supplier what is the reason and that this was their response:

"Memory is less, on vm servers, because there is an overpass (128-200 MB), which is deducted from the total memory, if you need more RAM you ask accordingly."

This explanation does not seem right, because I think General cool knowledge happens on the hypervisor and comments should receive all the memory configured, if there are no limits set by resource management policies.

They sent me a screenshot of VMclient which shows

Memory: 1024 MB

Overhead: 104,53 MB

Use of the memory of the host: 855 MB

Memory usage comments: 471 MB

Is there a bad configuration on their side, or am I missing something here?

There may be a missunderstanding. When you assign 1024Mo to the guest who is the amount of memory the burst enables the OS. Point.

If you ask me, your provider is pulling on your legs.

Some useful links:

http://pubs.VMware.com/vi35/resmgmt/vc_rm__jumpstart.3.3.html

Find what

"Memory of the Virtual Machine.

Each virtual machine consumes memory based on its configured size, more the additional memory overhead for virtualization.

Configured size.

The configured size is a building maintained by the virtualization for the VM layer. This is the amount of memory that is presented to the guest operating system, but it is independent of the amount of physical RAM that is allocated to the virtual machine, which depends on the resource (shares, booking, limit) parameters explained below.

For example, consider a virtual machine with a configured size of 1 GB. When the guest operating system starts, he believes that it is running on a machine with 1 GB of physical memory. The actual amount of memory physical host allocated to the virtual machine depends on its resource settings memory and memory on the host ESX Server contention. In some cases, the virtual machine may charge the full 1 GB. In other cases, he could receive a small stipend. Whatever the actual distribution, the guest operating system continues to behave as if it is running on a machine with 1 GB of physical memory dedicated. "

here: http://pubs.vmware.com/vi35/resmgmt/vc_basic_mgmt.4.17.html

AWo

VCP / VMware vEXPERT 2009

\[:o]===\[o:]

= Due to a lack of employees, human beings humans are working here. -Treat it with care, they are rare. =

Tags: VMware

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