Date: Sun, 19 Dec 2004 08:07:20 +1100 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: ticso@cicely.de Cc: Gary Corcoran <garycor@comcast.net> Subject: Re: Multiple hard disk failures - coincidence ? Message-ID: <20041218210720.GE97121@cirb503493.alcatel.com.au> In-Reply-To: <20041218195910.GD1068@cicely12.cicely.de> References: <41C3D62D.7000808@comcast.net> <20041218091739.GC97121@cirb503493.alcatel.com.au> <20041218195910.GD1068@cicely12.cicely.de>
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On Sat, 2004-Dec-18 20:59:11 +0100, Bernd Walter wrote: >On Sat, Dec 18, 2004 at 08:17:39PM +1100, Peter Jeremy wrote: >> My approach to this is to add a line similar to >> dd if=/dev/ad0 of=/dev/null bs=32k >> for each disk into /etc/daily.local (or /etc/weekly.local or whatever). >> This ensures that the disks are readable on a regular basis. > >Regular reading of every file is part of what I call backup. That only verifies the used part of the disk. Reading the unused parts of the disk as well helps reduce surprises. Also, in a mirrored environment, the backup does not ensure that the data can be read off both disks. (Or the parity area for RAID-5). -- Peter Jeremy
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