On Thu, Jan 25, 2007 at 10:57:17AM +0800, Wee Yeh Tan wrote: > On 1/25/07, Bryan Cantrill <[EMAIL PROTECTED]> wrote: > >... > >after all, what was ZFS going to do with that expensive but useless > >hardware RAID controller? ... > > I almost rolled over reading this. > > This is exactly what I went through when we moved our database server > out from Vx** to ZFS. We had a 3510 and were thinking how best to > configure the RAID. In the end, we ripped out the controller board > and used the 3510 as a JBOD directly attached to the server. My DBA > was so happy with this setup (especially with the snapshot capability) > he is asking for another such setup.
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. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
