[lustre-discuss] Lustre newbie problems: formatting disk or partition with Lustre filesystem fails

[Stefano Turolla]

Dear all,
I am very new to Lustre and I am pretty sure I am missing something, but
here is my problem.

I am setting up Lustre for a small Linux cluster ( 6 nodes ).

We have a PowerVault MD3800i Storage device connetcted throug iSCSI,
disk size is around 30TB

The "master" runs scientific linux 7.23 and I installed lustre 2.8 from
https://downloads.hpdd.intel.com/public/lustre/latest-feature-release/el7.2.1511/server/RPMS/x86_64/

Following rpms have been installed
[root at newmaster ~]# rpm -qa|grep lustre
perf-3.10.0-327.3.1.el7_lustre.x86_64
kernel-3.10.0-327.3.1.el7_lustre.x86_64
lustre-modules-2.8.0-3.10.0_327.3.1.el7_lustre.x86_64.x86_64
python-perf-3.10.0-327.3.1.el7_lustre.x86_64
kernel-headers-3.10.0-327.3.1.el7_lustre.x86_64
kernel-tools-libs-3.10.0-327.3.1.el7_lustre.x86_64
kernel-tools-libs-devel-3.10.0-327.3.1.el7_lustre.x86_64
lustre-osd-ldiskfs-mount-2.8.0-3.10.0_327.3.1.el7_lustre.x86_64.x86_64
lustre-osd-ldiskfs-2.8.0-3.10.0_327.3.1.el7_lustre.x86_64.x86_64
kernel-devel-3.10.0-327.3.1.el7_lustre.x86_64
kernel-tools-3.10.0-327.3.1.el7_lustre.x86_64
lustre-2.8.0-3.10.0_327.3.1.el7_lustre.x86_64.x86_64

The lnet module is loaded
[root at newmaster ~]# cat /etc/modprobe.d/lustre.conf
options lnet networks=tcp0(eth2)

The problem is the following: when I try to format the disk (entire
disk) with lustre ( MDT and MGS are on the same server for the test)  I
get the following error:

[root at newmaster ~]# mkfs.lustre --reformat --fsname=seq_data --mgs --mdt
--index=0 /dev/sdb

   Permanent disk data:
Target:     seq_data:MDT0000
Index:      0
Lustre FS:  seq_data
Mount type: ldiskfs
Flags:      0x65
              (MDT MGS first_time update )
Persistent mount opts: user_xattr,errors=remount-ro
Parameters:

device size = 31457280MB
formatting backing filesystem ldiskfs on /dev/sdb
        target name  seq_data:MDT0000
        4k blocks     8053063680
        options        -J size=4096 -I 512 -i 2048 -q -O
dirdata,uninit_bg,^extents,dir_nlink,quota,huge_file,64bit,flex_bg -E
lazy_journal_init -F
mkfs_cmd = mke2fs -j -b 4096 -L seq_data:MDT0000  -J size=4096 -I 512 -i
2048 -q -O
dirdata,uninit_bg,^extents,dir_nlink,quota,huge_file,64bit,flex_bg -E
lazy_journal_init -F /dev/sdb 8053063680
   Found a gpt partition table in /dev/sdb
   Extents MUST be enabled for a 64-bit filesystem.  Pass -O extents to
rectify.

mkfs.lustre FATAL: Unable to build fs /dev/sdb (256)

mkfs.lustre FATAL: mkfs failed 256




If I add the -O extents as suggested I get a different error:

[root at newmaster ~]# mkfs.lustre --reformat --fsname=seq_data --mgs --mdt
--index=0 -O extents /dev/sdb

mkfs.lustre FATAL: OST type is exclusive with MDT,MGS
mkfs.lustre: exiting with 22 (Invalid argument)



Could you please help me to understand what I am doing wrong?
thanks
Stefano


-- 
Stefano Turolla
Gene Center
University of Munich