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Merged
merged 2 commits into from
Apr 4, 2018
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Sgb docsp 2098 #3279

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dcc6e23
Clarify instructions on balloon driver.
Apr 4, 2018
1e3b720
better para breaks
Apr 4, 2018
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17 changes: 7 additions & 10 deletions source/includes/extracts-production-notes-base.yaml
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Expand Up @@ -6,20 +6,17 @@ content: |
to your virtual machines than the physical machine has available. When
memory is overcommitted, the hypervisor reallocates memory between the
virtual machines. {{software}}'s balloon driver {{balloonDriverLiteral}} reclaims the
pages that are considered least valuable. The balloon driver resides
inside the guest operating system. When the balloon driver expands,
pages that are considered least valuable.

The balloon driver resides inside the guest operating system. When the balloon driver expands,
it may induce the guest operating system to reclaim memory from guest
applications, which can interfere with MongoDB's memory management and
affect MongoDB's performance.

You can disable the balloon driver and {{software}}'s memory overcommitment
feature to mitigate these problems. However, disabling the balloon driver
can cause the hypervisor to use its swap, as there is no other available
mechanism to perform the memory reclamation. Accessing data in swap
is much slower than accessing data in memory, which can in turn affect
performance. Instead of disabling the balloon driver and memory
overcommitment features, map and reserve the full amount of memory for
the virtual machine running MongoDB. This ensures that the balloon
Do not disable the balloon driver and memory
overcommitment features. This can cause the hypervisor to use its swap which
will affect performance. Instead, map and reserve the full amount of
memory for the virtual machine running MongoDB. This ensures that the balloon
will not be inflated in the local operating system if there is memory
pressure in the hypervisor due to an overcommitted configuration.

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