[lustre-discuss] The safe path for upgrading servers from 2.5.3 to 2.12.x

[Tung-Han Hsieh]

Dear Nguyen,

Usually the upgrade procedure is the following:

1. Shutdown the Lustre file system completely.
   (umount all the clients and servers)

2. In all the clients and servers, install the new version of Lustre
   software. If your servers are Lustre with ldiskfs backend, please
   install the recommand version of e2fsprogs package.
   (see https://www.lustre.org/download/)

3. In all the servers and clients, unload the Lustre modules by:

	lustre_rmmod

   Or you can reboot these machines instead.

4. In each of the servers, run the following command to upgrade:

	tunefs.lustre --writeconf /dev/<device_name>

   Note that you have to do it for all the MGS / MDT / OST.

5. When running tunefs.lustre, it may prompt you to turn on some options
   of the ldiskfs file system of corresponding device using the e2fsprogs
   utilities. Just follow the indications.

6. Then the upgrade is completed. You can try to restart the Lustre file
   system.

I used to upgrade from version 2.5.X to 2.10.X and 2.12.X directly.
Everything looks fine to me.

Cheers,

T.H.Hsieh


On Mon, Nov 30, 2020 at 11:17:03PM +0700, Nguyen Viet Cuong wrote:
> Hi there,
> 
> Can anyone advise me the safe way to upgrade Lustre server from 2.5.3 to
> 2.10.x or 2.12.x? I am running 2.5.3 on CentOS 6.5 with a FDR card. I now
> have to upgrade the card to EDR or HDR.
> 
> And, is there anyone successfully connecting servers with the mix of EDR
> and HDR200? And how?
> 
> Best regards,
> Nguyen Viet Cuong

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