--- Eric Anderson <[EMAIL PROTECTED]> wrote: > First, understand that RAID 5 is dependant on fast hardware to > performa > the XOR operations. A single disk without any RAID can easily > outperform a RAID array if the RAID array is on a 'slow' > controller. > The Highpoint controllers are not exactly high-end fast RAID > controllers, so ~50MB/s isn't too bad for that I would say. > Did you happen to try a vinum RAID5? How about a stripe? > Furthermore RAID-5 needs to read the parity block, before it can update that block, so that there are 2 disc transactions more, which could explain the better performance of a single disk, too?
Or does the striping effect (inherent to RAID-5) compensate those 2 extra transactions (at least in case of sequential writes)? -Arne __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "[EMAIL PROTECTED]"
