[lustre-discuss] Experience with DDN AI400X

[Andreas Dilger]

On Mar 30, 2021, at 11:54, Spitz, Cory James via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>> wrote:

Hello, Megan.

I was curious why you made this comment:
> A general example is a box with lustre-client 2.10.4 is not going to be completely happy with a new 2.12.x on the lustre network
In general, I think that the two LTS release are very interoperable.  What incompatibility are you referring to?  Do you have a well-known LU or two to share?

This could potentially relate to changes with configuring Multi-Rail LNet between those releases?

On 3/30/21, 12:14 PM, "lustre-discuss on behalf of Ms. Megan Larko via lustre-discuss" <lustre-discuss-bounces at lists.lustre.org<mailto:lustre-discuss-bounces at lists.lustre.org> on behalf of lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>> wrote:

Hello!

I have no direct experience with the DDN AI400X, but as a vendor DDN has some nice value-add to the Lustre systems they build.  Having worked with other DDN Lustre hw in my career, interoperability with other Lustre mounts is usually not an issue unless the current lustre-client software on the client boxes is a very different software version or network stack.  A general example is a box with lustre-client 2.10.4 is not going to be completely happy with a new 2.12.x on the lustre network.  As far as vendor lock-in, DDN support in my past experience does have its own value-add to their Lustre storage product so it is not completely vanilla.  I have found the enhancements useful.  As far as your total admin control of the DDN storage product, that is probably up to the terms of the service agreement made with purchase.   My one experience with DDN on that is contractually DDN maintained the box version level and patches, standard Lustre tunables were fine for local admins.  In one case we did stumble upon a bug, I was permitted to dig around freely but not to change anything; I shared my findings with the DDN team.  It worked out well for us.

P.S.  I am not in any way employed or compensated by DDN.    I'm just sharing my own experience.   Smile.

Cheers,
megan
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Cheers, Andreas
--
Andreas Dilger
Principal Lustre Architect
Whamcloud






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