From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Stripe dirty bitmap Date: Sun, 04 Jul 2010 20:26:40 -0400 Message-ID: <4C3126C0.4050709@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids Sure would be nice to have md track whole never written stripes, so creating an array didn't have to be done over a three day weekend. When any part of a virgin stripe was written it could then be initialized properly, and when a virgin stripe was read zeros could be returned without disk i/o. It doesn't matter that the reads are done in parallel, with modern disk the bus is the bottleneck. With eSATA arrays the bus is slow to start with, passing TB through it should be avoided if possible. -- Bill Davidsen "We can't solve today's problems by using the same thinking we used in creating them." - Einstein