[lustre-discuss] How to configure OST and OSS on separate nodes

[jeevan.patnaik at wipro.com]

Hi,

Now, it cleared my confusion. So, we really should go for having storage as separate, we will fix with this option.

And besides, I have completely ignored ZFS till now. Can I go for ZFS instead of ldiskfs? What's the main difference I can find?

--
Regards,
Jeevan.

From: lustre-discuss [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Oliver Mangold
Sent: Wednesday, January 27, 2016 3:25 PM
To: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] How to configure OST and OSS on separate nodes

On 27.01.2016 10:36, jeevan.patnaik at wipro.com<mailto:jeevan.patnaik at wipro.com> wrote:
But my question is: Can I use OST on client and OSS on separate server (if it is possible to run OST and OSS on separate servers)


I don't understand what you mean. OSS is just a name for the machine which runs one or multiple OSTs. So by definition OSTs always run on OSSes.


The reason for this is we have tens of servers with internal hard disk of 4T each which we want to use it for OSTs, but all these servers are also should be clients (they are the grid execution hosts).
Sounds like a bad idea to me to do that. Beside the mentioned memory pressure problems, you also don't have a failover configuration for the OSTs, which is strongly recommended. Otherwise one downed server will stall all or most of your active jobs.


So, I am thinking of having separate OSSs and use the servers itself as OSTs. Also, do we need to install lustre kernel in all those OSTs? Because, all these servers are running with kernel 2.6.32-573.12.1.el6.x86_64, which the standard lustre packages won't be supporting. So, we need to roll back to 32-504_lustre kernel and again we need to work on setting yum repos, installing packages, resolving dependencies required for our tools..it's really a lot of work.


The last I know is, you need a patched kernel when using ldiskfs as the backing filesystem, but you can use a patchless kernel with ZFS.




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