2.0.0.12 firmware has some performance problems compare to the latest firmware (3.2.0.7).   I highly recommend updating to the latest firmware.  Be sure and follow the upgrade instructions CARFULLY.  Specifically, update each switch separately, with no network traffic and update the bootcode from the bootcode, not the application firm. Is the vlan 102 traffic traveling across the stacking links?  Do you get the same performance when using a single switch?   what are the other switches in your network?
Pair of 6224's stacked with several VLAN's.  On VLAN 101 we have a large storage system and many servers.  On VLAN 102 we many additonal servers.  All servers are running Windows 2003.  The 6224's are the core of the network with only field switches connected via LAG's.  When running disk read/write performance tests from the servers to the NAS storage, we find that any server in VLAN 102 reads/writes at roughly 1/2 the rate of servers in VLAN 101.  Example, server A IP 10.1.1.100 writes to NAS at 10.1.1.155 (routes through server field switch through core to NAS field switch) writes at roughly 80Mbps.  Server B IP 10.2.2.100 writes to NAS at 10.1.1.155 (routes through server field switch through core to NAS field switch) writes at roughly 35Mbps.  We can duplicate this performance across any server in our farms. My thought is I am having performance issues when routing from the 102 to the 101 network. We are running an old version of the firmware but before I upgrade I wanted to see if anyone has experienced anything like this. Config: show running-config !Current Configuration:!System Description "Dell 24 Port Gigabit Ethernet, 2.0.0.12, VxWorks5.5.1"!System Software Version 2.0.0.12!configurevlan databasevlan  101-103exitsnmp-server location "xxxxxx"snmp-server contact "xxxxxxx"hostname "PC6224"sntp unicast client enablesntp server 192.43.244.18clock timezone -7 minutes 0 zone "mdt"stackmember 1 1member 2 1exitip address 192.168.168.1 255.255.255.0ip name-server 10.1.1.205ip name-server 10.1.1.206ip routingip route 0.0.0.0 0.0.0.0 10.1.1.1interface vlan 101name "internal"routingip address  10.1.1.5  255.255.255.0exitinterface vlan 102name "dmz"routingip address  10.2.2.5  255.255.255.0exitinterface vlan 103name "public"routingip address  216.38.214.135  255.255.255.128exitusername "admin" password 1790728c3b2eea2bb079c4c5c98d0fe2 level 15 encryptedspanning-tree mst configurationname "00-1E-C9-86-9F-C4"exit!interface ethernet 1/g2switchport access vlan 101exit!interface ethernet 1/g3channel-group 5 mode onswitchport access vlan 101exit!interface ethernet 1/g4channel-group 8 mode onswitchport access vlan 101exit!interface ethernet 1/g5channel-group 9 mode onswitchport access vlan 101exit!interface ethernet 1/g6channel-group 9 mode onswitchport access vlan 101exit!interface ethernet 1/g7channel-group 8 mode onswitchport access vlan 101exit!interface ethernet 1/g8switchport access vlan 101exit!interface ethernet 1/g9channel-group 10 mode onswitchport access vlan 102exit!interface ethernet 1/g10channel-group 10 mode onswitchport access vlan 102exit!interface ethernet 1/g11switchport access vlan 101exit!interface ethernet 1/g12switchport access vlan 102exit!interface ethernet 1/g13channel-group 6 mode onswitchport access vlan 102exit!interface ethernet 1/g14channel-group 7 mode onswitchport access vlan 102exit!interface ethernet 1/g15negotiation 1000fswitchport access vlan 102exit!interface ethernet 1/g16negotiation 1000fswitchport access vlan 102exit!interface ethernet 1/g17channel-group 1 mode autoswitchport access vlan 102exit!interface ethernet 1/g18channel-group 2 mode autoswitchport access vlan 102exit!interface ethernet 1/g19channel-group 3 mode autoswitchport access vlan 103exit!interface ethernet 1/g20channel-group 4 mode autoswitchport access vlan 103exit!interface ethernet 1/g21switchport access vlan 103exit!interface ethernet 1/g22no negotiationspeed 100switchport access vlan 103exit!interface ethernet 1/g23switchport access vlan 103exit!interface ethernet 1/g24spanning-tree cost 20000switchport access vlan 103exit!interface ethernet 2/g2switchport access vlan 101exit!interface ethernet 2/g3channel-group 5 mode onswitchport access vlan 101exit!interface ethernet 2/g4channel-group 8 mode onswitchport access vlan 101exit!interface ethernet 2/g5channel-group 9 mode onswitchport access vlan 101exit!interface ethernet 2/g6channel-group 9 mode onswitchport access vlan 101exit!interface ethernet 2/g7channel-group 8 mode onswitchport access vlan 101exit!interface ethernet 2/g8switchport access vlan 101exit!interface ethernet 2/g9channel-group 10 mode onswitchport access vlan 102exit!interface ethernet 2/g10channel-group 10 mode onswitchport access vlan 102exit!interface ethernet 2/g11switchport access vlan 101exit!interface ethernet 2/g12switchport access vlan 101exit!interface ethernet 2/g13channel-group 6 mode onswitchport access vlan 102exit!interface ethernet 2/g14channel-group 7 mode onswitchport access vlan 102exit!interface ethernet 2/g15negotiation 1000fswitchport access vlan 102exit!interface ethernet 2/g16negotiation 1000fswitchport access vlan 102exit!interface ethernet 2/g17channel-group 1 mode autoexit!interface ethernet 2/g18channel-group 2 mode autoexit!interface ethernet 2/g19channel-group 3 mode autoexit!interface ethernet 2/g20channel-group 4 mode autoexit!interface ethernet 2/g21switchport access vlan 103exit!interface ethernet 2/g22switchport access vlan 103exit!interface ethernet 2/g23switchport access vlan 103exit!interface ethernet 2/g24switchport access vlan 103exit!interface port-channel 1description 'dmz uplink to F5'switchport access vlan 102exit!interface port-channel 2description 'dmz uplink to F5'switchport access vlan 102exit!interface port-channel 3description 'pub uplink to F5'switchport access vlan 103exit!interface port-channel 4description 'pub uplink to F5'switchport access vlan 103exit!interface port-channel 5description 'vlan 101 uplink'switchport access vlan 101exit!interface port-channel 6description 'vlan 102 uplink dell 30.2'switchport access vlan 102exit!interface port-channel 7description 'vlan 102 uplink 3com 15.4'switchport access vlan 102exit!interface port-channel 8description 'vlan 101 uplink dell 15.4'switchport access vlan 101exit!interface port-channel 9description '101 LAG to DB Switch'switchport access vlan 101exit!interface port-channel 10description 'dmz link to 102 switch'switchport access vlan 102exitsnmp-server user admin READ_noAuthNoPrivsnmp-server community lp roexit
VLAN Routing Performance Issues