[lustre-discuss] Updating mgsnode IP command completes successfully, but old IP remains

[Thomas Roth]

Dear Ricardo,

perhaps the syntax of the --mgsnode specification?

Which Lustre version are you running? There might have been changes in the way mgsnodes are specified.

And the four NIDs you mentioned, are these all failover partners? Or DNS nodes?

Example from our site:
We have three MDS, each a pair of active server and failover partner.
The format command for the first (MGS+MDT0) read (under Lustre 2.10.6):
 > ... --servicenode=10.20.3.0 at o2ib5 --servicenode=10.20.3.1 at o2ib5 --mgsnode=10.20.3.0 at o2ib5 --mgsnode=10.20.3.1 at o2ib5 ...
No comma, no colon.
The format command for the second (MDT1) read:
 > ...  --servicenode=10.20.2.236 at o2ib5 --servicenode=10.20.2.237 at o2ib5 --mgsnode=10.20.3.0 at o2ib5 --mgsnode=10.20.3.1 at o2ib5 ...
Obviously the servicenodes are the IPs of MDT1 and its failover partner, the mgsnodes are again the IPs of MGS and its partner.


Regards,
Thomas

On 11/30/21 19:05, Ricardo Brugman wrote:
> Hi all,
> 
> I’ve seen many questions/issues came by and I decided to post the issue that I encountered.
> 
> Recently I tried updating the mgsnode IP address on a lustre node and although the command executed successfully, the old IP value remained.
> 
> Old value: 10.10.10.2 (points to a server that is not a mgsnode)
> New value: 10.10.10.201 at o2ib,10.10.10.202 at o2ib,10.10.10.203 at o2ib,10.10.10.204 at o2ib
> 
> Please find the command and output below:
> 
> [root at xxx ~]# tunefs.lustre --erase-param mgsnode --writeconf --mgsnode=10.10.10.201 at o2ib,10.10.10.202 at o2ib,10.10.10.203 at o2ib,10.10.10.204 at o2ib zfs_R10_nvme0-4/dne_mdt1
> checking for existing Lustre data: found
> 
>     Read previous values:
> Target:     neohpfs-MDT0001
> Index:      1
> Lustre FS:  neohpfs
> Mount type: zfs
> Flags:      0x1
>                (MDT )
> Persistent mount opts:
> Parameters: mgsnode=10.10.10.2 at o2ib
> 
>     Permanent disk data:
> Target:     neohpfs=MDT0001
> Index:      1
> Lustre FS:  neohpfs
> Mount type: zfs
> Flags:      0x141
>                (MDT update writeconf )
> Persistent mount opts:
> Parameters:  mgsnode=:10.10.10.201 at o2ib,10.10.10.202 at o2ib,10.10.10.203 at o2ib,10.10.10.204 at o2ib
> [root at xxx ~]#
> 
> I did restart the lustre service thinking this would perhaps load the new value/config and although the service came up successfully, it still had not loaded the new value.
> 
> Appreciate any help, suggestions you can provide as to why the new value was not saved/loaded. In case I made a mistake, or I followed the incorrect step(s)/process than please, feel free to point that out.
> 
> Best Regards,
> Ricardo
> 
> 
> _______________________________________________
> lustre-discuss mailing list
> lustre-discuss at lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>