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Windows Server 2008 R2 Thread, Exchange 2010 - Back Pressure in Technical; Hellooooo! Have come across a problem which has me confused (not a difficult occurrence to be fair). Please understand that ...
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    Exchange 2010 - Back Pressure

    Hellooooo!

    Have come across a problem which has me confused (not a difficult occurrence to be fair). Please understand that my knowledge of Servers is somewhat limited and have adopted this, and have never built a server.

    1) I have a Linux Mailserver feeding into an Exchange 2010 Server.
    2) Recently i started having mail flow issues and they would hold on the Linux server and not be delivered. I dug up a variety of errors and have arrived at the conclusion that i have an 'Exchange Back Pressure' issue which is, based on the event logs, due to insufficient disk space. However, the partition where my Exchange is installed has 2.5GB of space.
    3) There appears lots of information about what the causes of 'Back Pressure' are but, nothing very definitive on how to resolve it. Do i need to buy Easeus and resize my partitions? Even when their appears to be space available.

    One thing i have discovered is that after a restart of the server, i buy myself about 3-4 days where everything works fine again.

    Any help or advice on this would be excellent. Thanks in advance.

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    You need to either change the threshold for back pressure i.e reduce this, but I don't recommend this for your env as it seems like something is chewing up the diskspace.

    Or you need to investigate what is chewing up the disk space where the event is being logged.

    Or you need to increase the partition. Now you can use 3rd party tools but the supported way be through Windows management, dependent on disk/type. Or stand up another Exch server and move services/mbxs across.

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    This is my Event log. Does this offer anything else to consider. Looks like the Queue folder has an issue but, the mail.que inside it is in a normal state. What does this mean?
    Also, if my mail flow stops and i restart the server, it picks up again. Surely this would not change the disk space. Hmmm, more and more confused, i am.

    ================================================== ============================================

    Log Name: Application
    Source: MSExchangeTransport
    Date: 09/11/2013 01:00:33
    Event ID: 15006
    Task Category: ResourceManager
    Level: Error
    Keywords: Classic
    User: N/A
    Computer: XXXXXXX.xxxxxxxxxx.local
    Description:
    Microsoft Exchange Transport is rejecting message submissions because the available disk space has dropped below the configured threshold.
    The following resources are under pressure:
    Queue database logging disk space ("C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\data\Queue\") = 94% [Medium] [Normal=92% Medium=94% High=96%]
    Physical memory load = 96% [limit is 94% to start dehydrating messages.]
    The following components are disabled due to back pressure:
    Inbound mail submission from the Internet
    Mail submission from Pickup directory
    Mail submission from Replay directory
    Content aggregation
    The following resources are in normal state:
    Queue database and disk space ("C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\data\Queue\mail.que") = 94% [Normal] [Normal=94% Medium=96% High=98%]
    Version buckets = 0 [Normal] [Normal=80 Medium=120 High=200]
    Private bytes = 3% [Normal] [Normal=71% Medium=73% High=75%]
    Batch Point = 0 [Normal] [Normal=1000 Medium=2000 High=4000]

    Event Xml:
    <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    <System>
    <Provider Name="MSExchangeTransport" />
    <EventID Qualifiers="49156">15006</EventID>
    <Level>2</Level>
    <Task>15</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-11-09T01:00:33.000000000Z" />
    <EventRecordID>2366586</EventRecordID>
    <Channel>Application</Channel>
    <Computer>XXXXXXX.xxxxxxxx.local</Computer>
    <Security />
    </System>
    <EventData>
    <Data>
    The following resources are under pressure:
    Queue database logging disk space ("C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\data\Queue\") = 94% [Medium] [Normal=92% Medium=94% High=96%]
    Physical memory load = 96% [limit is 94% to start dehydrating messages.]
    The following components are disabled due to back pressure:
    Inbound mail submission from the Internet
    Mail submission from Pickup directory
    Mail submission from Replay directory
    Content aggregation
    The following resources are in normal state:
    Queue database and disk space ("C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\data\Queue\mail.que") = 94% [Normal] [Normal=94% Medium=96% High=98%]
    Version buckets = 0 [Normal] [Normal=80 Medium=120 High=200]
    Private bytes = 3% [Normal] [Normal=71% Medium=73% High=75%]
    Batch Point = 0 [Normal] [Normal=1000 Medium=2000 High=4000]
    </Data>
    </EventData>
    </Event>

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    You could move your queue to another disk/partition? It's probably ideal for performance anyway....
    It doesn't change the disk space but that is a DB, it can grow and shrink....
    Change the Location of the Queue Database: Exchange 2010 Help

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