Hello, I am currently using lustre 1.8. I am relatively new with lustre. At the moment, I am trying to move an mds/mgs system from one disk to another.
I used the version of tar modified by whamcloud in order to dump and restore the filesytem. I used mkfs.lustre to create a new mds/mgs filesystem on my /dev/sdc. I then I mounted the old mds at /mnt/mdsold and the new mds at /mnt/mdsnew using filesystem type "ldiskfs" I replicated the filesystem with the following command sequence: cd /mnt/mdsold && tar —sparse —xattrs –cf - . | (cd /mnt/mdsnew && tar —sparse —xattrs –xvpf -) However, look at the output of df: Filesystem Size Used Avail Use% Mounted on /dev/sdd 2.3T 7.9G 2.1T 1% /mnt/mdsold /dev/sdc 815G 3.1G 765G 1% /mnt/mdsnew Now, why would the new filesystem use 3.1 gigabytes when the old one takes up 7.9G? ======================= Side note question: I have used the same version of tar to get a file-level backup of my mds: tar —xattrs —sparse –cf - . >sdd.tar The file created was 61 gigabytes in size. Filesystem Size Used Avail Use% Mounted on /dev/sdd 2.3T 7.9G 2.1T 1% /mnt/mdsold Why is this? Do the attributes take up extra space? Thanks!
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