On Wed, 21 May 2008, Krutibas Biswal wrote: >> > Thanks. Can somebody point me to some documentation on this ? > I wanted to see 24 drives so that I can use load sharing between > two controllers (C1Disk1, C2Disk2, C1Disk3, C2Disk4...) for > performance. > > If I enable multipathing, would the drive do automatic load balancing > (sharing) between the two controllers ?
This depends on the capability of the storage hardware and the model for it that the multipathing software uses. For example, the StorageTek 2540 (which I use) does not have load-share support in hardware so the multipathing operates as active/standby. In order to help offset this, the 12 drives in the 2540 are split across its two controllers so that 6 drives are active on one controller, and the other 6 drives are active on the second controller. With some care (e.g. mirror drive pairing), the traffic for one set of drives is sent down one path, while the traffic for the second set of drives is sent down the other path. If a path or controller fails, then the other controller and FC path takes charge and the multipathing software should direct all traffic down that one path. For JBOD, this approach provides the performance benefits of load-share until there is a path failure. 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
