Re: How to verify/fix High Disk Read Latencies in Exch2003 ?

The Troubleshooting Analyzer tool just showed one single user which presents
higher RPC latency than normal, what doesn't indicate a broad problem in the
server according to the report.

Can you confirm whether high Physical Disk/%Disk Time is a good indication
of bottlenecks ?

"Marlon Brown" <MarlonBrown@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:OTPdwvUHGHA.524@xxxxxxxxxxxxxxxxxxxxxxx
> Darn. I think this is an actual issue.
> I am running Perfmon Physical Disk/% DiskTime:
> The paritition in which the information store is mounted shows %DiskTime
> utilization of 80-100 steady. I will run the Troubleshooting Analyzer to
> see what I get.
>
> The servers have the databases installed on a SAN drive, Raid 1+0, with
> 143GB free disk space (70% free disk space). Not sure what could be
> causing such latency...
>
>
> "Andy David - MVP" <adavid@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
> message news:5flvs1lebbmao8t6ps1eufgmt1rncukoud@xxxxxxxxxx
>> On Thu, 19 Jan 2006 09:58:04 -0800, Marlon Brown
>> <MarlonBrown@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>>>MOM2005SP1 keeps warning that various Exchange 2003 Servers experience
>>>the
>>>issue below:
>>>
>>>High Disk Read Latencies for the past 10 minutes
>>>PhysicalDisk: Avg. Disk sec/Read: 0 C: value = 0.059590036231884. The
>>>average over last 10 samples is 0.05959.
>>>
>>>Can you indicate what's the best way to troubleshoot and fix this ?
>>>I think the first step would be by running Perfmon and setting manual
>>>Disk
>>>counters to see whether this is an actual problem. Can you point me a
>>>document or tell me the counter parameters I should be looking for to
>>>determine whether this an actual issue ? Also, if you know how to improve
>>>this in case it is an actual issue, I would appreciate your input.
>>
>>
>> Start here:
>> http://www.microsoft.com/Downloads/details.aspx?familyid=4BDC1D6B-DE34-4F1C-AEBA-FED1256CAF9A&displaylang=en
>>
>> Microsoft Exchange Server Performance Troubleshooting Analyzer Tool
>> v1.0
>>
>>
>> Make sure you have the latest firmware and updates for your Raid
>> Controllers and disks.
>>
>>
>> Have you sized your servers appropriately?
>>
>> http://www.microsoft.com/technet/prodtechnol/exchange/2003/library/highavailgde.mspx
>>
>
>


.

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