On Mon, 9 Feb 2009, John Welter wrote: > A bit about the workload: > > - 99.999% large reads, very small write requirement. > - Reads average from ~1MB to 60MB. > - Peak read bandwidth we see is ~180MB/s, with average around 20MB/s > during peak hours.
This is something that ZFS is particularly good at. > Proposed hardware: > > - Dell PowerEdge 2970's, 16GB RAM, quad cores of AMD. > - LSI 1068 based SAS cards * 2 per server > - 4 MD1000 with 1TB ES2's * 15 > - Configured as 2 * 7 disk RaidZ2 with 1 HS per chassis > - Intel 10 gig-e to the switching infrastructure The only concern might be with the MD1000. Make sure that you can obtain it as a JBOD SAS configuration without the advertised PERC RAID controller. The PERC RAID controller is likely to get in the way when using ZFS. There has been mention here about unpleasant behavior when hot-swapping a failed drive in a Dell drive array with their RAID controller (does not come back automatically). Typically such simplified hardware is offered as "expansion" enclosures. Sun, IBM, and Adaptec, also offer good JBOD SAS enclosures. It seems that you have done your homework well. > 1) Solaris, OpenSolaris, etc?? What's the best for production? Choose Solaris 10U6 if OS stability and incremental patches are important for you. ZFS boot from mirrored drives in the PowerEdge 2970 should help make things very reliable, and the OS becomes easier to live-upgrade. > 3) any other words of wisdom - we are just starting out with ZFS but do > have some Solaris background. You didn't say if you will continue using FreeBSD. While FreeBSD is a fine OS, my experience is that its client NFS read performance is considerably less than Solaris. With Solaris clients and a Solaris server, the NFS read is close to "wire speed". FreeBSD's NFS client is not so good for bulk reads, presumably due to its read-ahead/caching strategy. Bob ====================================== Bob Friesenhahn bfrie...@simple.dallas.tx.us, 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
