On Wed, 24 Jun 2009, Orvar Korvar wrote:
I thought of exchanging my PCI card with a PCIe card variant instead to reach higher speeds. PCI-X is legacy. The problem with PCIe cards is that soon SSD drives will be common. A ZFS raid with SSD would need maybe PCIe x 16 or so, to reach max band width. The PCIe cards are all PCIe x 4 or something of today. I need a PCIe x 16 card to make it future proof for the SSD discs. Maybe the best bet would be to attach a SSD disc directly to a PCIe slot, to reach max transfer speed? Or wait for SATA 3? I dont know. I want to wait until SSD
I don't think this is valid thinking because it assumes that write rates for SSDs are higher than for traditional hard drives. This assumption is not often correct. Maybe someday.
SSDs offer much lower write latencies (no head seek!) but their bulk sequential data transfer properties are not yet better than hard drives.
The main purpose for using SSDs with ZFS is to reduce latencies for synchronous writes required by network file service and databases.
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
