<div>Hi All</div><div><br></div><div>Thanks a lot for all your answers.</div><div><br></div><div>So I was right but also a bit wrong :)</div><div><br></div><div>Agan thanks a lot.</div><div><br></div><div>Regards</div><div>Per Qvindesland</div><div><br></div><blockquote style="border:0;border-left: 2px solid #22437f; padding:0px; margin:0px; padding-left:5px; margin-left: 5px; "><font face="verdana" size="2">--- Original message follows ---<br><b>Subject: </b>Re: [CentOS] OT Question about raid 5<br><b>From: </b>Jerry Franz <jfranz@freerun.com><br><b>To: </b>"CentOS mailing list" <centos@centos.org><br><b>Date: </b>21-04-2009 21:28<br></font><br><br>Per Qvindesland wrote:<br>> Hi List<br>><br>> I am hoping that someone here could perhaps give me a straight answer <br>> on a question that someone asked me today<br>><br>> I have always belived that if you have 5 hard drives 1 50gb second <br>> 50gb third 20gb fourth 60gb firth 30gb
that the largest would then be <br>> the size of the smallest disk, not 80 or 100 or 120 for that matter or <br>> am I wrong here<br>In general you are correct for simple 'out of the box' type <br>configurations and for most hardware RAID controllers.<br><br>But there are advanced tricks that can be played with 'hybrid' RAID <br>levels that can achieve larger sizes from smaller drives.<br><br>For your example drives of 2 x 50GB, 1 x 20GB, 1 x 60GB, and 1 x 30GB, <br>using software RAID, you could use use linear mode to make one 50GB <br>'drive' out of the 30GB and the 20GB and then make a RAID5 out of the 2 <br>X 50GB the 1 X 60GB and the 'fake' 1 x 50GB resulting in a RAID5 with <br>150GB available vs a naive 'just bang them together' as a 5 x 20GB RAID5 <br>approach which would only give you 80GB.<br><br>-- <br>Benjamin Franz<br>_______________________________________________<br>CentOS mailing
list<br>CentOS@centos.org<br>http://lists.centos.org/mailman/listinfo/centos</blockquote>