On Tue, Jul 31, 2012 at 03:56:54PM +0200, Stefan Priebe - Profihost AG wrote: > Hello list, > > i'm planning to create a couple of VMs with just 30GB of space while > using xfs as the main filesystem. > > Now i alreay know that some of the VMs will grow up to 250GB while > resizing the block device and using xfs_growfs. Just use thin provisioning and make it 250GB to begin with. Thin provisioning mades filsystem grow/shrink pretty much redundant.... > Should i take care of that and format these disks with special parameters? > > I've discovered that a 500GB volume has agcount=4 and 64000 blocks > of internal log - while a 300GB volume resized to 500GB has agcount > 7 ad only 40960 blocks of internal log. I doubt you'll ever notice the difference. > Is it a problem if this grow will happen in small portions (30GB => > 50GB => 75GB => 100GB => ... 300GB)? Growing a filesystem by an order of magnitude is the limit of what I'd suggest is sane. Growing it by two orders of magnitude (espcially if you start with a 16 AG filesystem because of stripe alignment) is going to cause problems with the number of AGs and the subsequent freespace management scale issue.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
