What about fsck times???
Posted Jan 24, 2008 16:17 UTC (Thu) by alonz
In reply to: What about fsck times???
Parent article: A better ext4
I'm not sure metadata clustering (and/or parallel fsck) will be sufficient to solve the fsck problems. Metadata clustering is more of an issue for ext3 (which has per-block metadata) than for ext4 (which has extents), and parallel fsck only helps when metadata is split over several disks (e.g. RAID), but not with single huge disks.
I had hoped to see is something like (for example) Daniel Phillips' idea in http://lkml.org/lkml/2008/1/13/146: a small change in ext4 metadata format (adding a reverse mapping), which may allow fsck to operate on-the-fly and way faster than it is now. This is (IMO) far more scalable than the other approaches, whose effects are at most linear.
to post comments)