[Lustre-discuss] Newbie - Unable to mount the OST on the Client

[Mohr Jr, Richard Frank (Rick Mohr)]

On Jan 7, 2015, at 3:33 PM, "Gupta, Amit" <amit.gupta at optum.com> wrote:

> 1) Run "debugfs -c $MGT_DEVICE" on the MGS server, and then cd into the CONFIGS/ directory to check if the "client1-client" config file exists.
>  
> [root at mgs]#  debugfs -c -R 'ls -l CONFIGS' /dev/mapper/mpathcp1
> debugfs 1.42.12.wc1 (15-Sep-2014)
> /dev/mapper/mpathcp1: catastrophic mode - not reading inode or group bitmaps
>   32769   40755 (2)      0      0    4096  6-Jan-2015 13:09 .
>       2   40755 (2)      0      0    4096  6-Jan-2015 13:10 ..
>      12  100644 (1)      0      0   12288  6-Jan-2015 13:10 mountdata
>      81  100644 (1)      0      0       0  6-Jan-2015 13:10 params-client
>      82  100644 (1)      0      0       0  6-Jan-2015 13:10 params
>      83  100644 (1)      0      0   11200  6-Jan-2015 13:10 temp-client
>      84  100644 (1)      0      0    9792  6-Jan-2015 13:10 temp-MDT0000
>     104  100644 (1)      0      0   10600  6-Jan-2015 13:12 client2-client
>     105  100644 (1)      0      0    8880  6-Jan-2015 13:12 client2-OST0000
>     107  100644 (1)      0      0   10600  6-Jan-2015 23:38 client1-client
>     108  100644 (1)      0      0    8880  6-Jan-2015 23:38 client1-OST0000
>  

It looks like there is (or was) a file system called "temp" that was created with a MDT but no OST.  The other file systems ("client1" and "client2") have an OST, but no MDT.  If that is accurate, it explains why you can't mount "client1".

-- 
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu