[Lustre-discuss] lustre and software RAID

Eudes PHILIPPE eudes at cisneo.fr
Fri Jan 21 13:01:36 PST 2011

I’m not an expert on lustre, just begin with it J but


What is your version of e2fsprogs?


What is your command line to format your raid?




De : lustre-discuss-bounces at lists.lustre.org
[mailto:lustre-discuss-bounces at lists.lustre.org] De la part de Samuel
Envoyé : vendredi 21 janvier 2011 21:37
À : lustre-discuss at lists.lustre.org
Objet : [Lustre-discuss] lustre and software RAID


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


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


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 <http://molonc.bccrc.ca/> 




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