<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><font class="Apple-style-span" face="Arial">I am setting up a new system. After partitioning /dev/sda, transferring my partition over to /dev/sdb using</font><div><font class="Apple-style-span" face="Arial"><br></font></div><div><p style="margin: 0.0px 0.0px 7.0px 0.0px; font: 9.0px Menlo"><span style="letter-spacing: 0px; "><font class="Apple-style-span" face="Arial" size="3"><b>sfdisk -d /dev/sda | sfdisk --force /dev/sdb</b></font></span></p><div><span style="letter-spacing: 0px; "><font class="Apple-style-span" face="Arial"><br></font></span></div><div><span style="letter-spacing: 0px; "><font class="Apple-style-span" face="Arial">And setting up the raid arrays using :</font></span></div><div><span style="letter-spacing: 0px; "><font class="Apple-style-span" face="Arial"><br></font></span></div><div><span style="letter-spacing: 0.0px"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 9px/normal Menlo; "><span style="letter-spacing: 0px; "><font class="Apple-style-span" face="Arial" size="3"><b>mdadm --create --verbose /dev/md1 --assume-clean --level=1 -e 0.90 --raid-devices=2 /dev/sda1 /dev/sdb1</b></font></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 9px/normal Menlo; "><span style="letter-spacing: 0px; "><font class="Apple-style-span" face="Arial" size="3"><b>mdadm --create --verbose /dev/md2 --assume-clean --level=1 -e 0.90 --raid-devices=2 /dev/sda2 /dev/sdb2</b></font></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 9px/normal Menlo; "><span style="letter-spacing: 0px; "><font class="Apple-style-span" face="Arial" size="3"><b>mdadm --create --verbose /dev/md3 --assume-clean --level=1 -e 0.90 --raid-devices=2 /dev/sda3 /dev/sdb3</b></font></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 9px/normal Menlo; "><span style="letter-spacing: 0.0px"><b><br></b></span></div></span><div><font class="Apple-style-span" face="Arial">Everything seems OK, however if I reboot all the drive names change to :</font></div><div><font class="Apple-style-span" face="Arial"><br></font></div><div><font class="Apple-style-span" face="Arial"><b><div>cat /proc/mdstat </div><div>Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] </div><div>md125 : active (auto-read-only) raid1 sdb1[1] sda1[0]</div><div> 262080 blocks [2/2] [UU]</div><div> </div><div>md126 : active (auto-read-only) raid1 sdb2[1] sda2[0]</div><div> 4194240 blocks [2/2] [UU]</div><div> </div><div>md127 : active (auto-read-only) raid1 sdb3[1] sda3[0]</div><div> 972305024 blocks [2/2] [UU]</div><div> </div><div>unused devices: <none></div></b></font></div><span style="letter-spacing: 0.0px"><div style="font-weight: bold; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 9px/normal Menlo; "><span style="letter-spacing: 0.0px"><b><br></b></span></div></span></div><div><div><div><font class="Apple-style-span" face="Arial">While this in itself may not be a problem, after I install my OS (Linux of course) I get a kernel panic. I suspect the kernel panic is due to the kernel not finding the partition I specified in grub.conf and fstab (i.e. : /dev/md1|2|3). </font></div></div><div><font class="Apple-style-span" face="Arial"><br></font></div><div><font class="Apple-style-span" face="Arial">I have been struggling with mdadm raid for several days now, with little progress to show. dmraid seems to leverage what little support is provided by my onboard RAID controller, which seems like a good think. mdadm seems to just keep both drives in sync with each other without leveraging hardware. I might well be wrong there. So far I only tried mdadm.</font></div><div><font class="Apple-style-span" face="Arial"><br></font></div><div><font class="Apple-style-span" face="Arial">Alex</font></div><div><font class="Apple-style-span" face="Arial"><br></font></div><div><br></div><div>On 03/03/2012, at 09:33 , Marcos Raul Carot Collins wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Are you installing the OS or are you trying to implement to an extra hard disk <br>after installing?<br><br>I only set it up in Debian at install time (mdadm) and although you need some <br>partitioning background, it is prety easy. Let me know if that's your case and <br>I can guide you.<br><br>I haven't tried in other OSes...<br><br>Cheers,<br><br>Marcos<br><br>On Sábado 03 Marzo 2012 05:17:12 Tim White escribió:<br><blockquote type="cite">On 03/03/12 04:36, Alexander Hartner wrote:<br></blockquote><blockquote type="cite"><blockquote type="cite">Has anybody got any experience with either / both ? Which one do you<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">suggest ? I have been trying to configure mdadm for the past week<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">without success. Should I persist or try dmraid ? Is mdadm really so<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">much better then dmraid ?<br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">I've never used dmraid (and a quick read suggests it's for "software<br></blockquote><blockquote type="cite">raid" provided by certain bios).<br></blockquote><blockquote type="cite">What are you trying to achieve? I have successfully used mdadm many<br></blockquote><blockquote type="cite">times in the past, both with setting up raid and with repairing NAS's.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Tim<br></blockquote><blockquote type="cite">_______________________________________________<br></blockquote><blockquote type="cite">PLUG discussion list: <a href="mailto:plug@plug.org.au">plug@plug.org.au</a><br></blockquote><blockquote type="cite"><a href="http://lists.plug.org.au/mailman/listinfo/plug">http://lists.plug.org.au/mailman/listinfo/plug</a><br></blockquote><blockquote type="cite">Committee e-mail: <a href="mailto:committee@plug.org.au">committee@plug.org.au</a><br></blockquote><blockquote type="cite">PLUG Membership: <a href="http://www.plug.org.au/membership">http://www.plug.org.au/membership</a><br></blockquote>_______________________________________________<br>PLUG discussion list: <a href="mailto:plug@plug.org.au">plug@plug.org.au</a><br><a href="http://lists.plug.org.au/mailman/listinfo/plug">http://lists.plug.org.au/mailman/listinfo/plug</a><br>Committee e-mail: committee@plug.org.au<br>PLUG Membership: http://www.plug.org.au/membership<br></div></blockquote></div><br></div></body></html>