From mboxrd@z Thu Jan 1 00:00:00 1970 From: Josh Litherland Subject: Re: Superblock checksum problems Date: Mon, 04 Sep 2006 17:54:53 -0400 Message-ID: <1157406893.2990.22.camel@localhost> References: <1157236610.8070.7.camel@localhost> <17659.46517.979409.131348@cse.unsw.edu.au> <1157385612.2990.4.camel@localhost> <1157403347.2990.11.camel@localhost> <1157404398.2990.14.camel@localhost> <17660.39978.663609.990424@cse.unsw.edu.au> Reply-To: josh@temp123.org Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17660.39978.663609.990424@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Tue, 2006-09-05 at 07:35 +1000, Neil Brown wrote: > Try > for i in `seq 1 20`; do > dd if=/dev/sda of=/tmp/try-$i conv=direct > done > for i in `seq 2 20`; do > cmp -l /tmp/try-1 /tmp/try=$i > done I tried a variant of this: for i in `seq 1 20`; do dd if=/dev/sda1 of=/tmp/try-$i count=4 bs=4096 iflag=direct sleep 0.25 done Tried it with and without the sleep, on all 4 drives. In all cases, the 20 "try" files were identical. -- Josh Litherland (josh@temp123.org)