I tried with 4gb on both sides but no difference. Target dssv6 uses qle2562 and initiator macpro uses atto fc en82. At target side i have only 2 gb ram. can it be the reason of poor performance. Or atto and qlogic does not like each other? I tried several settings on fc cards. if i choose only Point to point connection no connection (only loop works) frame size doesnt make any difference (512-1024-2048) What can i do more without replacing atto card with another qlogic2562.Originally Posted by delk