[lustre-discuss] Exporting a lustre mounted directory via nfs

[Martin Hecht]

Hi,

I'm re-adding lustre-discuss (I mistakenly replied directly to Kurt).

It's interesting that you can't re-export the 2.5.3 system on the client
which is able to export the 1.8.9.

The support for the lustre 2 quotas has been added to the 1.8 client
somewhere between 1.8.7 and 1.8.9.
There are a few more commits to the 1.8 branch in Whamcloud's git, but
unfortunately there is not much activity anymore. Important  fixes which
haven't been landed on 1.8 are in LU-3596 and LU-1126.

best regards,
Martin

On 05/21/2015 07:03 PM, Kurt Strosahl wrote:
> Hi,
>
>    The purpose of it was to allow access to the lustre file system to any system that can mount over nfs (also because our lustre system runs over IB, and this allows peoples desktops to get to the system).
>
>    The thing is that the export of lustre 1.8.9 over the 1.8.7 client has been working for years (it was set up back in 2009 I believe, before I was on the project).  It is only the lustre 2.5.3 system that mounts but is not reachable via NFS.
>
>    Today I compiled the 2.5.3 client for a new system that has IB but does not need access to the lustre file system, mounted the new lustre system, and was able to export successfuly.  So the problem clearly lies with some combination of the old OS (RHEL5), old client (1.8.7) and new lustre (2.5.3).
>
>     This isn't the first oddity I've encountered.  Early in the testing process I discovered that the quotas in 2.5.3 are not visible to the 1.8.7 clients (but are visible to the 1.8.9 clients).
>
>     At this point I'm probably going to try building a new gateway (with new hardware and the new OS), mount the new lustre with the client I know works, and export the new area that way.
>
>     I was just hoping that someone would say "oh, just mount it with the derp option".
>
> thanks,
> Kurt
>
> ----- Original Message -----
> From: "Martin Hecht" 
> To: "Kurt Strosahl" 
> Sent: Thursday, May 21, 2015 12:51:41 PM
> Subject: Re: [lustre-discuss] Exporting a lustre mounted directory via nfs
>
> Hi Kurt,
>
> some time ago we had a client re-exporting a lustre 1.8.x in rhel5. It
> worked quite well, but I believe you shouldn't run too many nfs clients
> with this construct.
>
> What's the reason for the reexport? If your lustre is on an infiniband
> and you want to make it available on clients which have no IB card, lnet
> routing over a tcp-network might be a better option than the nfs re-export.
>
> If the reason is that you can't build the lustre client... well... the
> nfs reexport might be worth trying, but I don't have any experience with
> re-exporting a lustre 2 file system (although I think the client version
> is more important in this scenario).
>
> best regards,
> Martin
>
> On 05/20/2015 09:14 PM, Kurt Strosahl wrote:
>> Sorry, left off some important info...
>>
>> the system is rhel5, with client 1.8.7... the lustre file system is 2.5.3 (the system already exports a 1.8.9 lustre file system).
>>
>> w/r,
>> Kurt
>>
>> ----- Original Message -----
>> From: "Kurt Strosahl" 
>> To: lustre-discuss at lists.lustre.org
>> Sent: Wednesday, May 20, 2015 2:55:39 PM
>> Subject: Exporting a lustre mounted directory via nfs
>>
>> Good Afternoon,
>>
>>    I'm attempting to use nfs to export a lustre mount point on a client box (essentially acting as a gateway for systems that don't have the lustre client).  I've mounted lustre, and added it to the nfs exports file (it shows up as exported) but when I try to mount the nfs point the system hangs.  On the server side (the lustre gateway) I do see the test system authenticating.
>>
>> w/r,
>> Kurt
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