On Thu, Jan 25, 2007 at 09:52:05AM -0800, Richard Elling wrote: > Nicolas Williams wrote: > >The only benefit of using a HW RAID controller with ZFS is that it > >reduces the I/O that the host needs to do, but the trade off is that ZFS > >cannot do combinatorial parity reconstruction so that it could only > >detect errors, not correct them. It would be cool if the host could > >offload the RAID I/O to a HW controller but still be able to read the > >individual stripes to perform combinatorial parity reconstruction. > > OK, not the *only* benefit :-) IMHO, the most visible benefit is the > nonvolatile write cache. The RAID configuration is simply an implementation > detail.
Well, yes, but NVRAM could be a generic device. The task of taking one I/O from the host and mapping it to N + parity I/Os to actual devices is very specific to RAID. Nico -- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
