Exchange 2003 Public folders problem   

Hello,
I have a problem with an Exchange Server 2003 Ent. (IBM Blade Server -
Windows Server 2003) with 2 CPUs and 2 Gb of RAM.
Because of the 2Gb of RAM the boot.ini and the Registry have been modified
according to Microsoft's guidelines (/3GB e.t.c.).
(How to optimize memory usage in Exchange Server 2003:
http://support.microsoft.com/kb/815372/en-us)
The Databases and Transaction Logs exists on a Large SAN. Raid 1 for Logs,
10 disks-Raid 5 for Mailboxes and 10 disks-Raid 5 for Public folders.
The sizes of the Databases are: 25GB-Mailboxes, 24GB-Public folders.
The Public folders contain a large amount of mail items.
The problem is: Very slow performance of Public folders.
Here is the result of Microsoft's EXPTA (Performance Troubleshooting
Analyzer Tool):
      Miscellaneous Performance Health Checks
       Memory and Processor Counter Data
       Server manufacturer: IBM. Server model: IBM eServer BladeCenter HS20.
       This server has 4 processor(s) installed.
       Current processor speed on server exmail is 3400.
       Current processor speed on server exmail is 3400.
       Current processor speed on server exmail is 3400.
       Current processor speed on server exmail is 3400.
      Processor Context Switches per sec = 1063,36.
      Maximum Processor % Processor Time ( _Total) = 3,5%.
      Processor % Processor Time ( _Total) = 1%.
       Process (STORE) Private Bytes = 1039 MB.
       Process (inetinfo) Private Bytes = 55 MB.
       Process(emsmta) Private Bytes = 23 MB.
       Process (lsass) Private Bytes = 13,29 MB.
       Process (mad) Private Bytes = 25 MB.
       Process (System) Private Bytes = 0,03 MB.
       Database Database Cache Size= 896 MB.
       Memory Available Mbytes = 197.
       Memory Pages/sec = 0 pages/sec.
      Memory Pool Nonpaged Bytes = 28,53 MB.
      Memory Pool Paged Bytes = 28,03 MB.
      Memory Free System Page Table Entries = 18 KB.
       MSExchangeIS VM Largest Block Size = 961,5 MB.
       MSExchangeIS VM Total number of 16 MB Free Blocks = 7.
       MSExchangeIS VM Total number of Free Blocks = 297.
       MSExchangeIS VM Total Large Free Block Bytes = 1122,04 MB.
       MSExchangeIS Exchmem: Number of heaps with memory errors= 7.
       MSExchangeIS Exchmem: Number of memory errors = 49147.
       MSExchangeIS Exchmem: Number of heaps with memory errors should be 0.
The measured number is 7.
       MSExchangeIS Exchmem: Number of memory errors should be 0. The
measured number is 49147.
       The server exmail is exhibiting a memory bottleneck.
      The average number of megacycles of processor required per RPC
operation on this server is 18,52 MC/RPC Operation.


Any help will be appreciated.

date: Sun, 22 Jan 2006 01:48:04 +0200   author:   Kostas Mastrogiannis