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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple style='word-wrap: break-word;-webkit-nbsp-mode: space;-webkit-line-break: after-white-space'><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I’m not an expert on lustre, just begin with it </span><span lang=EN-US style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> but…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What is your version of e2fsprogs?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What is your command line to format your raid?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De :</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> lustre-discuss-bounces@lists.lustre.org [mailto:lustre-discuss-bounces@lists.lustre.org] <b>De la part de</b> Samuel Aparicio<br><b>Envoyé :</b> vendredi 21 janvier 2011 21:37<br><b>À :</b> lustre-discuss@lists.lustre.org<br><b>Objet :</b> [Lustre-discuss] lustre and software RAID<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I am having the following issue:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>trying to create an ext4 lustre filesystem attached to an OSS.<o:p></o:p></p></div><div><p class=MsoNormal>the disks being used are exported from an external disk enclosure.<o:p></o:p></p></div><div><p class=MsoNormal>i create a raid10 set with mdadm from 16 2Tb disks, this part seems fine.<o:p></o:p></p></div><div><p class=MsoNormal>I am able to format such an array with normal ext4, mount a filesytem etc.<o:p></o:p></p></div><div><p class=MsoNormal>however when i try the same thing, trying to format for a lustre filesystem I am unable to mount the filesystem and lustre does not seem to detect it.<o:p></o:p></p></div><div><p class=MsoNormal>the lustre format completes normally, without errors.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>If I arrange to present the disks as a RAID10 set from the external disk enclosure, which has it's own internal RAID capability,<o:p></o:p></p></div><div><p class=MsoNormal>(rather than trying to use mdadm on the OSS) the lustre formatting works fine and I can get a mountable OST.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>the kernel log reports the following when a mount is attempted:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>LDISKFS-fs (md2): VFS: Can't find ldiskfs filesystem<o:p></o:p></p></div><div><p class=MsoNormal>LustreError: 15241:0:(obd_mount.c:1292:server_kernel_mount()) premount /dev/md2:0x0 ldiskfs failed: -22, ldiskfs2 failed: -19. Is the ldiskfs module available?<o:p></o:p></p></div><div><p class=MsoNormal>LustreError: 15241:0:(obd_mount.c:1618:server_fill_super()) Unable to mount device /dev/md2: -22<o:p></o:p></p></div><div><p class=MsoNormal>LustreError: 15241:0:(obd_mount.c:2050:lustre_fill_super()) Unable to mount (-22)<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>lsmod reports that all the modules are loaded<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>fsck reports the following<o:p></o:p></p></div><div><div><p class=MsoNormal>fsck 1.41.10.sun2 (24-Feb-2010)<o:p></o:p></p></div><div><p class=MsoNormal>e2fsck 1.41.10.sun2 (24-Feb-2010)<o:p></o:p></p></div><div><p class=MsoNormal>fsck.ext2: Superblock invalid, trying backup blocks...<o:p></o:p></p></div><div><p class=MsoNormal>fsck.ext2: Bad magic number in super-block while trying to open /dev//md2<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>It would seem the filesystem has not been written properly, but mkfs reports no errors ....<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>lustre version 1.8.4<o:p></o:p></p></div><div><p class=MsoNormal>kernel 2.6.18-194.3.1.el5_lustre.1.8.4<o:p></o:p></p></div><div><p class=MsoNormal>disk array is a coraid SATA/AOE device which has worked fine in every other context<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>this seems like an interaction of lustre with software RAID on the OSS?<o:p></o:p></p></div><div><p class=MsoNormal>I wonder if anyone has seen anything like this before.<o:p></o:p></p></div></div><div><p class=MsoNormal>any ideas about this?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><div><div><div><div><div><div><div><div><div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black'>Professor Samuel Aparicio BM BCh PhD FRCPath<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black'>Nan and Lorraine Robertson Chair UBC/BC Cancer Agency<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black'>675 West 10th, Vancouver V5Z 1L3, Canada.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black'>office: +1 604 675 8200 cellphone: +1 604 762 5178: lab website <a href="http://molonc.bccrc.ca/">http://molonc.bccrc.ca</a><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black'><br><br><o:p></o:p></span></p></div></div></div></div></div></div></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>