On Fri, Oct 06, 2017 at 10:46:20AM +0200, Gandalf Corvotempesta wrote: > Hi to all, > i'm new to XFS. > > Which is the proper agcount for 2TB, 4TB and 8TB drives (not part of any RAID) ? > > mkfs.xfs automatically choosen 4 AGs. Isn't this too low ? No. Have a look at calc_default_ag_geometry in libxcmd/topology.c for how we calculate the default AG count / size. 4TB single-disks and smaller get 4 AGs; larger than that get 1AG per TB. RAID arrays are different. Semirelated question: for a solid state disk on a machine with high CPU counts do we prefer agcount == cpucount to take advantage of the high(er) iops and lack of seek time to increase parallelism? (Not that I've studied that in depth.) --D > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
