On Feb 16, 2008, at 06:43, Ross wrote: > It may not be relevant, but I've seen ZFS add weird delays to > things too. I deleted a file to free up space, but when I checked > no more space was reported. A second or two later the space appeared.
This also happens on FreeBSD's UFS if you have SoftUpdates enabled. I forget exactly how it works (see McKusick's paper), but basically there is a slight delay in updating the meta-data on disk, which gives the system some time to coalesce several operations in memory before doing any disk I/O. It makes it very easy to do an 'rm -rf' on several hundred megabytes, which returns to the command line almost immediately; it's several seconds before you hear any disk thrashing. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
