[Lustre-discuss] OST problem

[Lucius]

Hello everyone,

 

I would like to extend a OSS, which is still in current use. I would like to extend it with a server which has exactly the same HW configuration, and I’d like to extend it in an active/active mode.

I couldn’t find any documentation about this, as most of the examples show how to use failnode during formatting. However, I need to extend the currently working system without losing data.

Also, tunefs.lustre examples show only the parameter configuration, but they won’t tell if you need to synchronize the file system before setting the How would the system know that on the given server identified by its unique IP, which OST mirrors should run?

 

Thank you in advance,

Viktor

[Larry]

Hi Lucius,
lustre manual chapter 15 tells you how to do it

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[Lucius]

Hi Larry,

thank you for your answer, but I do not have the chance to use infiniband.
This description also starts with formatting the fs. I don't want to format
the already in user node. I would like to extend it online.
Is it possible to achieve full sync of the data of the two nodes (the one
existing already, and the second is the new that is on the new server about
to be attached) The old node has 50% of its capacity uploaded, the new node
is completely empty.

So the question is, how do I add a failnode to an online system and how do I
manage to get the data to be in synchron.
Hope someone can help

thank you,
Lucius

----- Eredeti üzenet -----
From: Larry
Sent: Tuesday, March 01, 2011 6:25 AM
To: Lucius
Cc: lustre-...@lists.lustre.org
Subject: Re: [Lustre-discuss] OST problem

[Wojciech Turek]

Hi Lucius,

I am not exactly sure what are you trying to do here. Do you have two OSS servers, first old one currently in production (OST 50% full), second a new one that you want to attach to your Lustre filesystem with (OST empty)?
Do you want to create a mirror of old OST on the new OST?

Adding a new failnode in Lustre is simple and can be done while filesystem is running. For that you use tunefs.lustre or lctl API, examples are in the Lustre manual.
If you would like to change current failonde configuration, for example change IP address or network type, you will need to stop Lustre filesystem and amend the configuration while lustre is stopped, please see examples in manual.

Cheers

Wojciech

[Cliff White]

For clarity, Lustre does not replicate data. If you add an OST, it is unique.

If you wish to do failover, this requires shared storage between two nodes. 

We do not replicate storage. 

If you wish to increase the size of your filesystem, you can add OSTs. 

cliffw

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cliffw

Support Guy

WhamCloud, Inc. 

www.whamcloud.com