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Exchange 2016 Back Pressure
This morning I wasnt recieving any external emails so I check my exchange 2016 box and notice this error
Event 15006, MSExchangeTransport
Microsoft Exchange Transport is rejecting message submissions because the available disk space has dropped below the configured threshold.The following resources are under pressure:
Used disk space ("D:\Microsoft\Exchange Server\V15\TransportRoles\
Used disk space ("D:\Microsoft\Exchange Server\V15\TransportRoles\
Overall Resources
The following components are disabled due to back pressure:
Mail resubmission from the Message Resubmission component.
Mail submission from Pickup directory
Mail submission from Replay directory
Mail resubmission from the Shadow Redundancy Component
Inbound mail submission from the Internet
The following resources are in normal state:
Private bytes
Queue length[Submission]
System memory
Version buckets[D:\Microsoft\Excha
Queue database and disk space ("D:\Microsoft\Exchange Server\V15\TransportRoles\
My D: drive is 602GB and I have 96GB free so I'm sure why this was back pressure was triggered or I'm just not understanding the formula.
I plan on adding addition disk space to this drive but I would like to understand what the threshold is so I dont run into this problem again. For the moment I have it disable through the EdgeTransport.exe.config.
Can someone tell how I can determine what the threshold for disk space?
Event 15006, MSExchangeTransport
Microsoft Exchange Transport is rejecting message submissions because the available disk space has dropped below the configured threshold.The following resources are under pressure:
Used disk space ("D:\Microsoft\Exchange Server\V15\TransportRoles\
Used disk space ("D:\Microsoft\Exchange Server\V15\TransportRoles\
Overall Resources
The following components are disabled due to back pressure:
Mail resubmission from the Message Resubmission component.
Mail submission from Pickup directory
Mail submission from Replay directory
Mail resubmission from the Shadow Redundancy Component
Inbound mail submission from the Internet
The following resources are in normal state:
Private bytes
Queue length[Submission]
System memory
Version buckets[D:\Microsoft\Excha
Queue database and disk space ("D:\Microsoft\Exchange Server\V15\TransportRoles\
My D: drive is 602GB and I have 96GB free so I'm sure why this was back pressure was triggered or I'm just not understanding the formula.
I plan on adding addition disk space to this drive but I would like to understand what the threshold is so I dont run into this problem again. For the moment I have it disable through the EdgeTransport.exe.config.
Can someone tell how I can determine what the threshold for disk space?
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What are the resources available on the Exchange server ... how many CPU/cores, memory, disk space available?
How is your paging file configured ... amount of RAM + 10MB?
Take a look at these references if you haven't already...
How is your paging file configured ... amount of RAM + 10MB?
Take a look at these references if you haven't already...
I have 4 cores, cpu is at 10%
16GB memory, setting at 79%
Disk space for my exchange drive 602GB 96GB free.
pagefile 16GB
The error is pointing to disk space and I'm trying to determine how it is calculated since I have 96GB free.
16GB memory, setting at 79%
Disk space for my exchange drive 602GB 96GB free.
pagefile 16GB
The error is pointing to disk space and I'm trying to determine how it is calculated since I have 96GB free.
The formula is
100 * (<hard drive size in MB> - 500 MB) / <hard drive size in MB>
In your case
100 * ( 602 x 1024 - 500) / (602 x 1024) = 99% which is roughly 7gb of free space you should be fine with 96 gb no matter what, are you sure it is not on another drive?
More info https://technet.microsoft.com/en-us/library/bb201658(v=exchg.160).aspx
100 * (<hard drive size in MB> - 500 MB) / <hard drive size in MB>
In your case
100 * ( 602 x 1024 - 500) / (602 x 1024) = 99% which is roughly 7gb of free space you should be fine with 96 gb no matter what, are you sure it is not on another drive?
More info https://technet.microsoft.com/en-us/library/bb201658(v=exchg.160).aspx
Thats what I thought, my C: is 100GB with 28GB free. It only has the OS installed.
The error points to D:
I have CU1 installed, I know CU3 has been released. I wonder if its a bug.
The error points to D:
I have CU1 installed, I know CU3 has been released. I wonder if its a bug.
Really curious behavior.... Any chance you had something filling out the disk and now it's not anymore or are you still seeing this behavior?
I had to disable it through the EdgeTrasport.exe.config and restart the transporter service in order for mail to work. its still disabled.
Re reading your OP you said it is only rejecting external emails so it is in the medium range and not high
But even though for 602 gb 96% that's 24 gb free space
But even though for 602 gb 96% that's 24 gb free space
Can you run
[xml]$bp=Get-ExchangeDiagn
What's the output
[xml]$bp=Get-ExchangeDiagn
What's the output
Resource : PrivateBytes
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=75 HighToMedium=73 LowToMedium=72 MediumToLow=71]
Pressure : 4
Resource : QueueLength[SubmissionQueu
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=15000 HighToMedium=10000 LowToMedium=9999 MediumToLow=2000]
Pressure : 0
Resource : SystemMemory
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=94 HighToMedium=89 LowToMedium=88 MediumToLow=84]
Pressure : 79
Resource : UsedVersionBuckets[D:\Micr
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=1500 HighToMedium=1000 LowToMedium=999 MediumToLow=800]
Pressure : 2
Resource : DatabaseUsedSpace[D:\Micro
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=99 HighToMedium=97 LowToMedium=96 MediumToLow=94]
Pressure : 86
Resource : UsedDiskSpace[D:\Microsoft
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=99 HighToMedium=90 LowToMedium=89 MediumToLow=80]
Pressure : 86
Resource : UsedDiskSpace[D:\Microsoft
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=99 HighToMedium=90 LowToMedium=89 MediumToLow=80]
Pressure : 86
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=75 HighToMedium=73 LowToMedium=72 MediumToLow=71]
Pressure : 4
Resource : QueueLength[SubmissionQueu
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=15000 HighToMedium=10000 LowToMedium=9999 MediumToLow=2000]
Pressure : 0
Resource : SystemMemory
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=94 HighToMedium=89 LowToMedium=88 MediumToLow=84]
Pressure : 79
Resource : UsedVersionBuckets[D:\Micr
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=1500 HighToMedium=1000 LowToMedium=999 MediumToLow=800]
Pressure : 2
Resource : DatabaseUsedSpace[D:\Micro
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=99 HighToMedium=97 LowToMedium=96 MediumToLow=94]
Pressure : 86
Resource : UsedDiskSpace[D:\Microsoft
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=99 HighToMedium=90 LowToMedium=89 MediumToLow=80]
Pressure : 86
Resource : UsedDiskSpace[D:\Microsoft
CurrentResourceUse : Low
PreviousResourceUse : Low
PressureTransitions : [PressureTransitions: MediumToHigh=99 HighToMedium=90 LowToMedium=89 MediumToLow=80]
Pressure : 86
So now you are at low and no backpressure however you are at 86 % and backpressure will move to medium at 89% (following your output) that's 3 % breathing space which might be the trigger / issue
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