On 8/5/2012 6:03 AM, Martin Steigerwald wrote: > Well the default was 16 AGs for volumes < 2 TiB AFAIR. And it has been > reduced to 4 for as I remember exactly performance reasons. Too many AGs > on a single device can incur too much parallelity. Thats at least is what > I have understood back then. For striped md/RAID or LVM volumes mkfs.xfs will create 16 AGs by default because it reads the configuration and finds a striped volume. The theory here is that more AGs offers better performance in the average case on a striped volume. With hardware RAID or a single drive, or any storage configuration for which mkfs.xfs is unable to query the parameters, mkfs.xfs creates 4 AGs by default. The 4 AG default has been with us for a very long time. It was never reduced. -- Stan _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
