Hello Gr-R,

Thanks for your reply.
I'll read the log I just download.
VMWare verified and validate my conf. The support ingeneer gives me some KB for the latency issue of the DSS storage :

http://kb.vmware.com/selfservice/mic...rnalId=1007688
Look for the DAVG/cmd field (device latency). This gives you an idea of how long the ESX host is waiting (in milliseconds) for SCSI commands submitted to the storage to come back with a response.

http://kb.vmware.com/selfservice/mic...rnalId=1008205
This is the average response time in milliseconds per command being sent to the device

http://kb.vmware.com/selfservice/mic...rnalId=1010213
The device latency average may vary depending of the device and the type of connection. The values are in milliseconds. Check with your array vendor for the appropriate value. If you see a spike or consistently high values (for example, values around 100), investigate with your storage vendor. you should see as well abort from the VMkernel log

I didn't restart the DSS yet, What do you think about this ?

Thanks again for any help.