On Mon, Jan 10, 2011 at 10:18:58AM -0800, Keith Lofstrom wrote: > I expect the SATAII connection will be quite a bit faster, > since I will be using different buses to stream the data > from drive to drive.
Uh ... no. The SATAII stuff arrived. While hdparm -t for the SATA2 interface says 90.7 MB/s, the dd command runs at 50.7 MB/s with the SATA2 hardware, as opposed to 47.7 MB/s with the Ultrabay and translator. So my expectation was false. Or perhaps there is a faster way to run "dd" than merely setting the blocksize to 8M (handling the data in larger chunks tends to save time). Or maybe a newer kernel will help. I am running an RHEL5.5 clone with the 2.6.18-164.2.1.el5 kernel. When RHEL6.1 comes out (RHEL6 just released), that will have the 2.6.32 kernel. The Ultrabay and drive weighs 7 ounces, while the SATA2 card and enclosure and cables and drive weighs 13 ounces. Sigh. 6 (fragile) travel ounces to save 10 minutes. I will stay with the Ultrabay. However, the SATA hardware will still be handy for drive copies when booted from a live CD (the CD drive uses the Ultrabay). Or if a new kernel breaks the AHCI drivers. Or if I want to play a movie off a hard drive. The brands I ended up with were: enclosure: Eagle Consus M-Series ET-CS2XMESU2-BK expresscard: BestConnectivity (SYBA) SD-EXP40014 Sil3132 chip The enclosure powers from two USB plugs. It claims to be "tool-less", but you need to poke into a hole with a screwdriver or paperclip to open it. Everything Just Worked after a reboot. Keith -- Keith Lofstrom [email protected] Voice (503)-520-1993 KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon" Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
