<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> <a class="moz-txt-link-abbreviated" href="mailto:fedora-list-request@redhat.com">fedora-list-request@redhat.com</a> wrote: <blockquote type="cite"> <pre wrap=""> Message: 2 Date: Sat, 24 Jun 2006 11:42:54 +0200 From: Mogens Kjaer <a class="moz-txt-link-rfc2396E" href="mailto:mk@crc.dk"><mk@crc.dk></a> Subject: Re: Software RAID To: For users of Fedora Core releases <a class="moz-txt-link-rfc2396E" href="mailto:fedora-list@redhat.com"><fedora-list@redhat.com></a> Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:449D091E.7050207@crc.dk"><449D091E.7050207@crc.dk></a> Content-Type: text/plain; charset=us-ascii; format=flowed Tom Spec wrote: ... </pre> <blockquote type="cite"> <pre wrap="">Clearly it's not as good as hardware RAID, but still I think it is MUCH better than nothing. </pre> </blockquote> <pre wrap=""> The SCSI hardware RAID controllers I've seen in the past (HP/Compaq SmartArray and an IBM serveraid) have all had worse performance than using Linux software RAID. Software RAID (RAID 5 in my case) was 2x faster writing and 3x faster reading than hardware RAID. Mogens </pre> </blockquote> I have been using software RAID5 and RAID0 for about 5 years formatted with reiserfs and the last couple of years it has been managed using mdadm. I currently have 8 JBOD RAID arrays totaling ~14TB running on Adaptec RAID controller cards. Only two problems I have seen are the speed of RAID5 is a little disappointing and a couple of the drive array chassis behave funny when booting. I think it's the time delay needing to be longer before starting the server to fix the booting issues. As for the RAID5 performance issue I am thinking of moving two boxes each over to RAID0 then set them up as a RAID1 between them. That may solve my need for speed. Bill Cronk </body> </html>