<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>I am having the following issue:</div><div><br></div><div>trying to create an ext4 lustre filesystem attached to an OSS.</div><div>the disks being used are exported from an external disk enclosure.</div><div>i create a raid10 set with mdadm from 16 2Tb disks, this part seems fine.</div><div>I am able to format such an array with normal ext4, mount a filesytem etc.</div><div>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.</div><div>the lustre format completes normally, without errors.</div><div><br></div><div>If I arrange to present the disks as a RAID10 set from the external disk enclosure, which has it's own internal RAID capability,</div><div>(rather than trying to use mdadm on the OSS) the lustre formatting works fine and I can get a mountable OST.</div><div><br></div><div>the kernel log reports the following when a mount is attempted:</div><div><br></div><div><div>LDISKFS-fs (md2): VFS: Can't find ldiskfs filesystem</div><div>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?</div><div>LustreError: 15241:0:(obd_mount.c:1618:server_fill_super()) Unable to mount device /dev/md2: -22</div><div>LustreError: 15241:0:(obd_mount.c:2050:lustre_fill_super()) Unable to mount (-22)</div></div><div><br></div><div>lsmod reports that all the modules are loaded</div><div><br></div><div>fsck reports the following</div><div><div>fsck 1.41.10.sun2 (24-Feb-2010)</div><div>e2fsck 1.41.10.sun2 (24-Feb-2010)</div><div>fsck.ext2: Superblock invalid, trying backup blocks...</div><div>fsck.ext2: Bad magic number in super-block while trying to open /dev//md2</div></div><div><br></div><div>It would seem the filesystem has not been written properly, but mkfs reports no errors ....</div><div><br></div><div>lustre version 1.8.4</div><div>kernel 2.6.18-194.3.1.el5_lustre.1.8.4</div><div>disk array is a coraid SATA/AOE device which has worked fine in every other context</div><div><br></div><div><div>this seems like an interaction of lustre with software RAID on the OSS?</div><div>I wonder if anyone has seen anything like this before.</div></div><div>any ideas about this?</div><div><br></div><div><br></div><div><br></div><br><div>
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; 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-webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>Professor Samuel Aparicio BM BCh PhD FRCPath</div><div>Nan and Lorraine Robertson Chair UBC/BC Cancer Agency</div><div>675 West 10th, Vancouver V5Z 1L3, Canada.</div><div>office: +1 604 675 8200 cellphone: +1 604 762 5178: lab website <a href="http://molonc.bccrc.ca/">http://molonc.bccrc.ca</a></div><div><font class="Apple-style-span" color="#144FAE"><span class="Apple-style-span" style="text-decoration: underline; "><br></span></font></div><div><font class="Apple-style-span" color="#144FAE"><span class="Apple-style-span" style="text-decoration: underline; "><br></span></font></div><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; 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