Good analysis. Generally X4500 can stream 2,5 GB/sec disk to RAM and around 1,2-1,4 GB/sec ram to disk. Network to disk or disk to network most of the time depends on the network interface.
With Infiniband we are seeing 1 GB/sec transfer speeds [2 OS disks, 6 spares] With dual IB initial results shows a sgood sustained 1,2 GB/sec throughput. When you comare this performance with anything offered today, it's very cost affective. Changing to PCI-E and offering more independent busses will increase the performance slighlty but today X4500 already offers more than enough performance for most things. Mertol Mertol Ozyoney Storage Practice - Sales Manager Sun Microsystems, TR Istanbul TR Phone +902123352200 Mobile +905339310752 Fax +902123352222 Email [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Friesenhahn Sent: Wednesday, June 25, 2008 6:45 PM To: Mertol Ozyoney Cc: zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] raid card vs zfs I see that the configuration tested in this X4500 writeup only uses the four built-in gigabit ethernet interfaces. This places a natural limit on the amount of data which can stream from the system. For local host access, I am achieving this level of read performance using one StorageTek 2540 (6 mirror pairs) and a single reading process. The X4500 with 48 drives should be capable of far more. The X4500 has two expansion bus slows but they are only 64-bit 133MHz PCI-X so it seems that the ability to add bandwidth via more interfaces is limited. A logical improvement to the design is to offer PCI-E slots which can support 10Gbit ethernet, Infiniband, or Fiber Channel cards so that more of the internal disk bandwidth is available to "power user" type clients. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
