[Lustre-discuss] lustre and software RAID

Samuel Aparicio saparicio at bccrc.ca
Fri Jan 21 14:08:02 PST 2011

ok thanks, I will look into 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

On Jan 21, 2011, at 2:00 PM, Andreas Dilger wrote:

> On 2011-01-21, at 14:50, Samuel Aparicio wrote:
>> 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
>> description:    Fourth Extended Filesystem
>> ---------
> After the filesystem is formatted with mkfs.lustre, you should be able to mount it directly with "mount -t ext4 /dev/md??? /mnt" and see a few files in it.
> If that doesn't work then the format failed for some reason.  Providing the output of "mkfs.lustre -v {options}" would help diagnose it.
>> 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/
>>> license:     GPL
>>> description: Fourth Extended Filesystem
>>>            ^^^^^^^^^^^^^^^^^^^^^^^^^^
>>> author:      Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others
>>> srcversion:  D5D8992C8B3E6FCA6ED4FF2
>>> depends:     
>>> vermagic: SMP mod_unload modversions 
>>> Cheers, Andreas
>>> --
>>> Andreas Dilger 
>>> Principal Engineer
>>> Whamcloud, Inc.
> Cheers, Andreas
> --
> Andreas Dilger 
> Principal Engineer
> Whamcloud, Inc.

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