Re: 2.1.111: IDE DMA disabled?

Leonard N. Zubkoff (
Fri, 31 Jul 1998 11:38:28 -0700

From: Gerard Roudier <>
Date: Thu, 30 Jul 1998 23:42:03 +0200 (MET DST)

Hmmm ...
I remember having read that the recommended queue depth for the Atlas II
on AIX is 38.

I've found 28 to be a good maximum in practice for the queue depth. There were
a few high performance drives whose performance dropped off when given a queue
depth greater than 28, and by 28 one has achieved most of the performance gain
due to seek optimization that tagged queuing will provide.


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