Now, RAIDZn should beat RAID-5 since it tends to queue up writes until
it can write a full stripe at once (right?)
correct.
so you will get _less_
writes required, but it still has the same problem for sparse writes
(i.e. small writes spaced far apart on the disk layout, where writes to
the same area are infrequent).
Where writes end up on disk is not controlled by application
behavior but by free blocks availability. Writes should
bunch up to either contiguous free blocks or at least
to blocks that have physical proximity.
____________________________________________________________________________________
Performance, Availability & Architecture Engineering
Roch Bourbonnais Sun Microsystems, Icnc-Grenoble
Senior Performance Analyst 180, Avenue De L'Europe, 38330,
Montbonnot Saint Martin, France
http://icncweb.france/~rbourbon http://blogs.sun.com/roch
[EMAIL PROTECTED] (+33).4.76.18.83.20
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
