Re: [HPDD-discuss] Shirinking the mdt volume

On 10/07/13 01:56, Bob Ball wrote: > When we set up our mdt volume, lo these many years past, we did it with > a 2TB volume. Overkill. About 17G is actually in use. > > This is a Lustre 1.8.4 system backed by about 450TB of OST on 8 > servers. I would _love_ to shrink this mdt volume to a more manageable > size, say, 50GB or so, as we are now in a down time before we upgrade to > Lustre 2.1.6 on SL6.4. I have taken a "dd" of the volume, and am now in > the process of doing > getfattr -R -d -m '.*' -P . > /tmp/mdt_ea.bak > after which I will do a > tar czf {backup file}.tgz --sparse > /bin/tar is the SL5 version tar-1.20-6.x86_64. This supports the > --xattrs switch. So, a choice here, should I instead use the --xattrs > switch on the tar, or should I use --no-xattrs since the mdt_ea.bak will > have all of them? > > What are my prospects for success, if I restore that tar file to a > smaller volume, then apply the attr backup, before I upgrade? > > Answers and advice are greatly appreciated. > Not a direct answer, but you should read: https://jira.hpdd.intel.com/browse/LUDOC-131 In essence, if your filesystem has extended attributes, or ACLs, when you mount the mdt as an ldiskfs filesystem, you need to explicitly specify them. What I should have done is: mount -t ldiskfs -o user_xattr -o acl /dev/sdb /mnt/mgs Otherwise the extended attributes and acls of the files are lost to the lustre filesystem. Chris _______________________________________________ HPDD-discuss mailing list HPDD-discuss(a)lists.01.org https://lists.01.org/mailman/listinfo/hpdd-discuss