Lustre discuss - Nov 2009 - getting "Not a directory" when accessing mount point

I''m running lustre 1.8.1.1 on CentOS 5.4.

 

I ran the following:

mkfs.lustre --mgs --mdt /dev/hdb

mount -t lustre /dev/hdb /mnt/lustre

 

And everything worked without errors and I got the following messages in
my logs:

Nov 25 11:23:58 localhost kernel: Lustre: lustre-MDT0000: new disk,
initializing

Nov 25 11:23:58 localhost kernel: Lustre: MDT lustre-MDT0000 now serving
lustre-

MDT0000_UUID (lustre-MDT0000/58b19442-2b9c-b7b6-4afc-c75a269effbc) with
recovery enabled

Nov 25 11:23:58 localhost kernel: Lustre:
2792:0:(lproc_mds.c:271:lprocfs_wr_group_upcall()) lustre-MDT0000: group
upcall set to /usr/sbin/l_getgroups

Nov 25 11:23:58 localhost kernel: Lustre: lustre-MDT0000.mdt: set
parameter group_upcall=/usr/sbin/l_getgroups

Nov 25 11:23:58 localhost kernel: Lustre: Server lustre-MDT0000 on
device /dev/hdb has started

 

And "df -h" shows the correct size of my lustre filesystem. However,
if
I try to ls (or access in other ways) to /mnt/lustre I get:

 

ls: /mnt/lustre: Not a directory

 

I was under the impression I didn''t need to create OSTs.  Any ideas
what
I''m doing wrong?  How do I access the lustre storage?

 

-Aaron

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On Wed, 2009-11-25 at 16:54 -0500, Aaron Siri wrote: 
> I ran the following:
> 
> mkfs.lustre --mgs --mdt /dev/hdb
> 
> mount -t lustre /dev/hdb /mnt/lustre
So this has started your meta-data service.  You now need "data"
service
(i.e. OST(s)).

> And ?df ?h? shows the correct size of my lustre filesystem. However,
> if I try to ls (or access in other ways) to /mnt/lustre I get:
> 
>  
> 
> ls: /mnt/lustre: Not a directory
You cannot actually access the /mnt/lustre that you mounted on the MDS.
> I was under the impression I didn?t need to create OSTs.
You most certainly do.  OSTs are where the data (i.e. the contents of
the files in your filesystem) are store.  You also need to mount the
Lustre filesystem (as a whole) on a client and access it from that
client.
> Any ideas what I?m doing wrong?  How do I access the lustre storage?
You create OSTs, mount them, then mount the filesystem on one or more
clients and access it from there.

It sounds like you really need to take a(nother) read through the
operations manual at manual.lustre.org to get a better picture of the
overall architecture.

b.


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Looking back at the cluster I created earlier I see that you are right.
For some reason I had it in my head that an ost wasn''t needed in the
simplest case.  Not sure what I was thinking...  Sorry.

-Aaron

-----Original Message-----
From: lustre-discuss-bounces at lists.lustre.org
[mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Brian J.
Murrell
Sent: Wednesday, November 25, 2009 5:02 PM
To: lustre-discuss at lists.lustre.org
Subject: Re: [Lustre-discuss] getting "Not a directory" when accessing
mount point

On Wed, 2009-11-25 at 16:54 -0500, Aaron Siri wrote: 
> I ran the following:
> 
> mkfs.lustre --mgs --mdt /dev/hdb
> 
> mount -t lustre /dev/hdb /mnt/lustre
So this has started your meta-data service.  You now need "data"
service
(i.e. OST(s)).

> And "df -h" shows the correct size of my lustre filesystem.
However,
> if I try to ls (or access in other ways) to /mnt/lustre I get:
> 
>  
> 
> ls: /mnt/lustre: Not a directory
You cannot actually access the /mnt/lustre that you mounted on the MDS.
> I was under the impression I didn''t need to create OSTs.
You most certainly do.  OSTs are where the data (i.e. the contents of
the files in your filesystem) are store.  You also need to mount the
Lustre filesystem (as a whole) on a client and access it from that
client.
> Any ideas what I''m doing wrong?  How do I access the lustre
storage?
You create OSTs, mount them, then mount the filesystem on one or more
clients and access it from there.

It sounds like you really need to take a(nother) read through the
operations manual at manual.lustre.org to get a better picture of the
overall architecture.

b.