[Lustre-discuss] lustre and software RAID

[Samuel Aparicio]

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)

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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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