On Mon, 22 Oct 2001, Yuwen Dai wrote:
> Hi, All > > I have two identical hard disk linked with one cable. The capacity of each > disk is 40G. I want to have the second disk be the mirror of the first disk > by using this command: > > dd if=/dev/hda of=/dev/hdb bs=32k > > Nearly 2 hours passed, dd still hadn't finished. I had to press 'Ctrl-C' to > stop it. Is this the right way to mirror a disk? Or is there some better > way to do this? Thanks in advance. After two hours, the best case is that you were transferring 6MB/sec, which isn't too bad. It may have been *just* shy of finishing when you cancelled it :( Use hdparm to enable DMA on the disks and see if it speeds up. If you don't know how to use hdparm, read its manual page (man hdparm). -jwb
