On 1/27/2012 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? Maybe you simply assigned 2 spares and forgot, so you actually only have 10 RAID6 disks with 8 disks worth of stripe, equaling 24 TB, or 21.8 TiB. 21.8 TiB matches up pretty closely with your 22 TB, so this scenario seems pretty plausible, dare I say likely. If this is the case you'll want to reformat the 10 disk RAID6 with the proper sunit/swidth values. -- Stan _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
