[lustre-discuss] Mount lustre client with MDS/MGS backup

[Pardo Diaz, Alfonso]

Oppps, damm copy and paste!

I am writing the correct output with same result. If the MDT is mounted in the backup MDS (192.168.8.10) the mounted client work OK, but new clients throw the next error:

mount -v -t lustre 192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs /mnt/fs
arg[0] = /sbin/mount.lustre
arg[1] = -v
arg[2] = -o
arg[3] = rw
arg[4] = 192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs
arg[5] = /mnt/fs
source = 192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs (192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs), target = /mnt/fs
options = rw
mounting device 192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs at /mnt/fs, flags=0x1000000 options=device=192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs
mount.lustre: mount 192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs at /mnt/fs failed: Input/output error retries left: 0
mount.lustre: mount 192.168.8.9 at o2ib:192.168.8.10 at o2ib:/fs at /mnt/fs failed: Input/output error
Is the MGS running?




> El 31 ago 2016, a las 15:32, Mohr Jr, Richard Frank (Rick Mohr) <rmohr at utk.edu> escribió:
> 
> 
>> On Aug 31, 2016, at 8:12 AM, Pardo Diaz, Alfonso <alfonso.pardo at ciemat.es> wrote:
>> 
>> I mount my clients: mount -t lustre mds1 at o2ib:mds2 at o2ib:/fs /mnt/fs
>> 
>> 1) When both MDS are OK I can mount without problems
>> 2) If the MDS1 is down and my clients have lustre mounted, they use MDS2 without problems
>> 3) If the MDS1 is down and I try to mount a new client, It can’t mount lustre with the next error:
>> 
>> 
> <snip>
>> arg[4] = 192.168.8.9 at o2ib:192.168.8.9 at o2ib:/fs
> 
> The client is resolving both hostnames (mds1 and mds2) to the same IP address.  I am guessing that this corresponds to mds1, so when it is down, there is no second host for the client to try.  Try specifying IP addresses instead of hostnames and see if that make a difference.
> 
> --
> Rick Mohr
> Senior HPC System Administrator
> National Institute for Computational Sciences
> http://www.nics.tennessee.edu
>