<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2658.24"> <TITLE>AW: RAID greater than 2TB on Fedora Core 3</TITLE> </HEAD> <BODY> hi scot, it's a RAID5 with 8 x 400GB disks, so i'd expected a size of appr. 2,8TB (Raid says it's about 2,6TB) but Fedora only see exactly 2TB.... thanks, Christian -----Ursprüngliche Nachricht----- Von: fedora-list-bounces@redhat.com [<A HREF="mailto:fedora-list-bounces@redhat.com">mailto:fedora-list-bounces@redhat.com</A>] Im Auftrag von Scot L. Harris Gesendet: Montag, 04. April 2005 17:14 An: 'fedora-list@redhat.com' Betreff: Re: RAID greater than 2TB on Fedora Core 3 On Mon, 2005-04-04 at 10:45, Masopust Christian wrote: > Dear all, > > maybe this is a dumb question from an newbie, but... ;-) > > I've connected a RAID with appr. 2,6TB to my new installed > Fedora-System (Fedora Core 3, Adaptec 39160 and RAID is an > EonStore). > > When running fdisk the biggest partition i can create is 2TB! > > when trying to create the filesystem with mkfs.xfs directly > on /dev/sda i also get only 2TB ! > > so, what am i doing wrong? is the adaptec 39160 the problem? > (this because i read something about such big raids working > with 3ware 9000 RAID cards) What raid level are you trying to setup? Each raid level utilizes the available drives in different ways which result in the usable space being different. If you have 2.6 TB of raw disk space and use Raid 1 (simple mirroring) you would only be able to create a file system with a size of 1.3 TB. The different raid levels provide some trade offs in usable space vs. speed of writes vs. speed of reads vs. resiliency. Raid 5 will have a 20% overhead due to the way it replicates data across multiple drives. If you are just trying to use all of the raw disk space you have in a single file system then you probably don't want raid, you want to use LVM. LVM creates logical volumes across multiple drives and allows you to create very large file systems. Understand though that this is not raid, it does not provide redundancy if one of the hard drives fails. -- Scot L. Harris webid@cfl.rr.com Mollison's Bureaucracy Hypothesis: If an idea can survive a bureaucratic review and be implemented it wasn't worth doing. -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: <A HREF="http://www.redhat.com/mailman/listinfo/fedora-list" TARGET="_blank">http://www.redhat.com/mailman/listinfo/fedora-list</A> </BODY> </HTML>