I am having the following issue: trying to create an ext4 lustre filesystem attached to an OSS. the disks being used are exported from an external disk enclosure. i create a raid10 set with mdadm from 16 2Tb disks, this part seems fine. I am able to format such an array with normal ext4, mount a filesytem etc. 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. the lustre format completes normally, without errors.
If I arrange to present the disks as a RAID10 set from the external disk enclosure, which has it's own internal RAID capability, (rather than trying to use mdadm on the OSS) the lustre formatting works fine and I can get a mountable OST. the kernel log reports the following when a mount is attempted: LDISKFS-fs (md2): VFS: Can't find ldiskfs filesystem 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? LustreError: 15241:0:(obd_mount.c:1618:server_fill_super()) Unable to mount device /dev/md2: -22 LustreError: 15241:0:(obd_mount.c:2050:lustre_fill_super()) Unable to mount (-22) lsmod reports that all the modules are loaded fsck reports the following fsck 1.41.10.sun2 (24-Feb-2010) e2fsck 1.41.10.sun2 (24-Feb-2010) fsck.ext2: Superblock invalid, trying backup blocks... fsck.ext2: Bad magic number in super-block while trying to open /dev//md2 It would seem the filesystem has not been written properly, but mkfs reports no errors .... lustre version 1.8.4 kernel 2.6.18-194.3.1.el5_lustre.1.8.4 disk array is a coraid SATA/AOE device which has worked fine in every other context this seems like an interaction of lustre with software RAID on the OSS? I wonder if anyone has seen anything like this before. any ideas about this? Professor Samuel Aparicio BM BCh PhD FRCPath Nan and Lorraine Robertson Chair UBC/BC Cancer Agency 675 West 10th, Vancouver V5Z 1L3, Canada. office: +1 604 675 8200 cellphone: +1 604 762 5178: lab website http://molonc.bccrc.ca
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