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How can I change the amount of memory that the Store can use in Microsoft Exchange 2000 Server and l |
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The Exchange Store is responsible for interfacing with the
Exchange database files. Because these files are disk based, the Exchange server
caches as much information as possible and the Store uses as much of the
machine's memory as possible, up to a default maximum of approximately 858MB of
RAM. The Store releases this memory when other processes need to use it. For
instance, on a system with 1GB of RAM, you shouldn't be surprised if the Store
typically uses more than 700MB. Having hundreds of megabytes of free memory
serves no purpose, so the Store simply puts available memory to good use.
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You can change
the amount of memory that Exchange uses for its
cache by carrying out the following steps (although
you should fully test any such change because it
might effect system performance):
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Install
the Windows 2000 or later support tools from the
server OS installation CD-ROM.
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Start the
ADSI Edit utility, which is one of the support
tools--go to Start, Run, and type
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From the
left-hand pane, expand the root and expand the
Configuration item.
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Expand
Services (each item will be prefixed by CN=),
Microsoft Exchange, <name of your
Exchange Organization>, Administrative Groups,
<name of the administrative group>, Servers,
<Name of the server for which you want to modify
the Store memory information>.
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Select the
server. In the right-hand pane, you'll see a
list of components that you can change.
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Right-click CN=InformationStore, then select
Properties from the context menu.
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Select the
Attribute Editor and ensure that the "Show
optional attributes" option is selected.
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Double-click "msExchESEParamCacheSizeMax,"
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Although
the value appears blank, Exchange sets this
value to default to 219726. The value refers to
the number of 4KB sections, otherwise known as
pages. The system uses 4KB increments because
the Extensible Storage Engine (ESE) database
that Exchange uses stores data in 4KB sections.
Enter a new value equal to the number of 4KB
sections required. For example, to limit the
Store to use 50MB of RAM, you'd enter a value of
12500 (you would never set the value this low on
a production server--I'm just using it here as
an example). Because of virtual address space
limitations, Microsoft recommends that you enter
a maximum value no larger than 307200, which is
approximately 1.2GB of memory. You should
typically increase the default value of 219726
only if you have more than 2GB of memory. For
maximum efficiency, ensure that the value you
enter is a multiple of 8192 (i.e., 2 pages).
Click OK.
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Click OK
to close the InformationStore Properties dialog
box, then close the ADSI Edit console window.
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Before the
change can take effect, the value for the
setting you entered in Step 9 needs to replicate
across the forest. After the change has
replicated, you need to restart the Store on the
targeted Exchange server for the change to take
effect.
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