Re: Exchange 2003 Performance issues with Entourage Clients

It's really a function of what format the mail in the mailbox exists in and
the format the client retrieves/submits it. MIME format messages are stored
in the STM and MAPI format in the EDB. If a WEBDAV (or POP or IMAP) client
retrieves messsages from or sends messages to a MAPI client on the same
store, a number of message attributes will be promoted from MAPI to MIME or
vica versa.

Depending on direction, content conversion takes place in either the
"working directory" or the system temp directory. In that it impacts other
users on the store, I'm guessing it's the IO for content conversion in the
working directory that is the issue (by default, the working directory is in
the same location as the first database). To prevent the content conversion
IO from impacting other users, the solution is to point the working
directory to an isolated spindle or set of spindles.

To change the location of the working directory, edit the registry

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
Value name: Working Directory
Value type: REG_SZ
Value data: path to the desired location ie X:\exchsrvr\mdbdata

and restart the IS




<james.sanger@xxxxxxxxxxxxx> wrote in message
news:149fbc1c-0c22-46f4-ba8c-c663a39a8e87@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
We currently have an issue since move mailboxes from one Exchange
2003
server to another. This was due to the need to upgrade server
hardware.

We have 22 Entourage users that are scattered across two Information
Stores. 10 on the first store and 12 on the second store.


We are getting very high disk writes on the second information i.e.
the store with 12 entoruage users. The first store is unaffected.


We have investigated that the issue is caused by the Entourage users
by asking all Entourage clients to disconnect from the Exchange 2003
server. We have then asked them to connect to the server one by one.
We have found that with one of the Entourage users connected, they
cause high disk writes. This has been mointored using PerfMon. This
is effecting the performance for all users with Outlook clients
complaining of slowness when switching calendars or shared mailboxes.


We have researched this issue and I must say it is a common one.


The article:-


http://www.macwindows.com/041107d.html


states that the issue has arisen due to the move of the entourage
user
mailboxes as there email has not been converted to Non MAPI hence
causing high disk writes as each mail is read everytime it is
accessed.


We have followed through all the fixes listed and have got some
improved performance but the issue is still not resolved.


Can anyone please advise on any steps to take to resolve this issue.


Our current network structure is:-


3 DC's.
2 Exchange Servers. All is the same Storage Groups.
Approx 100 Outlook Users
22 Entourage / Mac Users.


Thanks




.

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