modinfo reports as follows. seems like the ext4 modules. the odd thing is that the format works when the disk array is already presented as a raid set, rather than making the raidset with mdadm on the OSS
-------- filename: /lib/modules/2.6.18-194.3.1.el5_lustre.1.8.4/updates/kernel/fs/lustre-ldiskfs/ldiskfs.ko license: GPL description: Fourth Extended Filesystem author: Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others srcversion: B4DBDF5EA1FA02D1D1417AF depends: jbd2,crc16 vermagic: 2.6.18-194.3.1.el5_lustre.1.8.4 SMP mod_unload gcc-4.1 parm: default_mb_history_length:Default number of entries saved for mb_history (int) --------- 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 On Jan 21, 2011, at 12:59 PM, Andreas Dilger wrote: > On 2011-01-21, at 13:36, Samuel Aparicio wrote: >> 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. > > You are probably formatting the filesystem with an ext4 feature that is not > in the ldiskfs module you are using. > >> 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 > > Do you have the ext4-based ldiskfs RPM installed? It is a separate download > on the download page. You can check whether the ldiskfs module installed was > based on ext3 or ext4 with the "modinfo" command: > > [root]# modinfo ldiskfs > filename: > /lib/modules/2.6.32.20/updates/kernel/fs/lustre-ldiskfs/ldiskfs.ko > license: GPL > description: Fourth Extended Filesystem > ^^^^^^^^^^^^^^^^^^^^^^^^^^ > > author: Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, > Theodore Ts'o and others > srcversion: D5D8992C8B3E6FCA6ED4FF2 > depends: > vermagic: 2.6.32.20 SMP mod_unload modversions > > > Cheers, Andreas > -- > Andreas Dilger > Principal Engineer > Whamcloud, Inc. > > >
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