Lustre 1.6 Operations Manual

22.3.8 Default Striping
These are the default striping settings:
lov.stripesize=
lov.stripecount=
lov.stripeoffset=
To change the default striping information.
■
On the MGS:
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$ lctl conf_param testfs-MDT0000.lov.stripesize=4M
On the MDT and clients:
$ mdt/cli> cat /proc/fs/lustre/lov/testfs-{mdt|cli}lov/stripe*
22.3.9 Erasing a Filesystem
If you want to erase a filesystem, run this command on your targets:
$ "mkfs.lustre –reformat"
If you are using a separate MGS and want to keep other filesystems defined on that
MGS, then set the writeconf flag on the MDT for that filesystem. The writeconf
flag causes the configuration logs to be erased; they are regenerated the next time
the servers start.
To set the writeconf flag on the MDT:
1. Unmount all clients/servers using this filesystem, run:
$ umount /mnt/lustre
2. Erase the filesystem and, presumably, replace it with another filesystem, run:
$ mkfs.lustre –reformat --fsname spfs --mdt --mgs /dev/sda
22-10 Lustre 1.6 Operations Manual • September 2008