[lustre-discuss] mgsnode notation in mkfs and tunefs

[Hans Henrik Happe]

Hi,

I've recently experienced the same. To be honest, I can't remember how I 
used to do it. This way worked (2.10.3):

tunefs.lustre --erase-param --writeconf --param=mgsnode=<nid>:<nid>:...

Cheers,
Hans Henrik

On 02-03-2018 15:19, Thomas Roth wrote:
> Hi all,
> 
> (we are now on Lustre 2.10.2.)
> It seems there is still a difference in how to declare --mgsnode between 
> mkfs.lustre and tunefs.lustre.
> For an OST, I did:
> 
>  > mkfs.lustre --ost --backfstype=zfs  
> --mgsnode=10.20.3.0 at o2ib5:10.20.3.1 at o2ib5 --... osspool0/ost0
> 
> This OST mounts, is usable, all fine.
> 
> 
> Then I had to writeconf, and out of tradition, added --erase-params to 
> the command - so I had to add the mgsnodes as well:
> 
>  > tunefs.lustre --erase-param --writeconf 
> --mgsnode=10.20.3.0 at o2ib5:10.20.3.1 at o2ib5 osspool0/ost0
> 
> This did not mount, so I repeated this and other writeconfs, and ended 
> up with
> 
>  > tunefs.lustre --dryrun  osspool0/ost0
> checking for existing Lustre data: found
> 
>     Read previous values:
> Target:     hebe-OST0000
> Index:      0
> Lustre FS:  hebe
> Mount type: zfs
> Flags:      0x142
>                (OST update writeconf )
> Persistent mount opts:
> Parameters: 
> mgsnode=10.20.3.0 at o2ib5:10.20.3.1 at o2ib5:10.20.3.0 at o2ib5:10.20.3.1 at o2ib5:10.20.3.0 at o2ib5:10.20.3.1 at o2ib5 
> 
> 
> 
> Seems I could have added more and more mgsnodes, and never gotten a good 
> OST ;-)
> 
> I repaired this by:
> 
>  > tunefs.lustre --erase-param mgsnode   osspool0/ost0
>  > tunefs.lustre --writeconf  --mgsnode=10.20.3.0 at o2ib5 
> --mgsnode=10.20.3.1 at o2ib5 osspool0/ost0
> 
> 
> 
> This cluster is not yet in use - but if this happens with a production 
> system, when --writeconf is anyhow your last resort - uncomfortable 
> situation.
> 
> 
> Cheers
> Thomas
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