On 1/27/12 1:50 AM, Manny wrote: > Hi there, > > I'm not sure if this is intended behavior, but I was a bit stumped > when I formatted a 30TB volume (12x3TB minus 2x3TB for parity in RAID > 6) with XFS and noticed that there were only 22 TB left. I just called > mkfs.xfs with default parameters - except for swith and sunit which > match the RAID setup. > > Is it normal that I lost 8TB just for the file system? That's almost > 30% of the volume. Should I set the block size higher? Or should I > increase the number of allocation groups? Would that make a > difference? Whats the preferred method for handling such large > volumes? If it was 12x3TB I imagine you're confusing TB with TiB, so perhaps your 30T is really only 27TiB to start with. Anyway, fs metadata should not eat much space: # mkfs.xfs -dfile,name=fsfile,size=30t # ls -lh fsfile -rw-r--r-- 1 root root 30T Jan 27 12:18 fsfile # mount -o loop fsfile mnt/ # df -h mnt Filesystem Size Used Avail Use% Mounted on /tmp/fsfile 30T 5.0M 30T 1% /tmp/mnt So Christoph's question was a good one; where are you getting your sizes? -Eric > Thanks a lot, > Manny > > _______________________________________________ > xfs mailing list > xfs@xxxxxxxxxxx > http://oss.sgi.com/mailman/listinfo/xfs > _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
