On Sun, 14 Dec 2008, Dak wrote: > dedicated storage pools. With a JOBOD I will run into the same > problems which I have at this moment if the number of server is > growing, won't I? Is there some other way you would recommend in > order to solve this problem (one big storage pool; several backup > nodes)?
I don't understand your concern regarding JBOD. JBOD provides a way that your storage pool size can be increased by installing more drives, or adding another JBOD storage array. ZFS is very good at growing its storage size by adding more disks. With this approach you can maximize usable storage capacity by using a space efficient strategy like raidz or raidz2. Using backend servers with a complex disk-based OS (e.g. Solaris) is surely more failure prone than using devices which requires only "simple" firmware to boot and provide service. The iSCSI protocol over ethernet adds more latency and offers less throughput than the SAS or fiber channel that a JBOD array will use. If you are truely expecting your backend servers to be "backup nodes" then I think you are stuck with using simple mirroring on the head-end so that all of the data is available on each backup node. As someone pointed out to me, this approach achieves "maximum disk utilization" by consuming twice as much disk space. 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
