On Sat, 9 Jan 2010, bank kus wrote:

Probably not, but ZFS only runs in userspace on Linux
with fuse so it
will be quite different.

I wasnt clear in my description, I m referring to ext4 on Linux. In fact on a system with low RAM even the dd command makes the system horribly unresponsive.

IMHO not having fairshare or timeslicing between different processes issuing reads is frankly unacceptable given a lame user can bring the system to a halt with 3 large file copies. Are there ZFS settings or Project Resource Control settings one can use to limit abuse from individual processes?

I am confused. Are you talking about ZFS under OpenSolaris, or are you talking about ZFS under Linux via Fuse?

Do you have compression or deduplication enabled on the zfs filesystem?

What sort of system are you using?

Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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