Hello Doug

Please make sure that you read the email all the way to the end because 
there is an issue that could cause files to be overwritten.
The frm_admin tool has a relocate (reloc) command that allows to move a 
file from one disk partition to another one. The relocate command uses the 
lfn of a file and the space where the file should be moved to, for 
example:
   frm_admin -c <configfile>
   > reloc <lfn>  public:/array2
   > quit 
would move the lfn (/atlas/...) to the array2 partition.

In order to move all files of a partition you have to find all lfn's that 
are on array1 and create a list with a reloc command for each of these 
files, for example:
find /atlas -type l -ls \
   | awk ' $13 ~ /array1/  {print "reloc", $11, "public:array" int(NR%2+2)}' > to_reloc

This would evenly spread the files on array2 and array3. Check the output 
file that you have the proper reloc commands in it.

Once you have the file you can execute it with:
  frm_admin -c <config> < to_reloc

!!! Here is now a big BIG WARNING. !!!
Due to an issue creating unique names in the disk partitions you MUST 
NEVER run multiple frm_admin's within the same second (at least for 
relocation). If you run frm_admin as described above (reading commands 
from a file) you are save because you start only one frm_admin. However, 
if you would run two frm_admin at the same time or very fast one after the 
other the uniqueness of the file names in the file system is not 
guarantied.

You might want to reloc one or two files first to make sure that it is 
working.

Cheers,
   Wilko


On Tue, 18 Mar 2014, Doug Benjamin wrote:

> Hi,
>
> We have xrootd data server serving 3 partitions.  We have stitched them
> together with the oss.space command
>
> oss.space public /array1
> oss.space public /array2
> oss.space public /array3
>
> set exportpath = /atlas
>
> all.export $(exportpath) r/w stage purge
> all.export $(exportpath)/local r/w nopurge
>
> Unfortunately 2 drives have failed in /array1 (it is RAID 6) so I need move 
> the files
> from /array1 to the other areas.  Is there an xrootd command that I can use
> to move the files from one partition to another and allow the system to 
> export
> the new files.
>
> Thanks,
>
> Doug B
>
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