From hijiangwen at gmail.com Fri May 9 10:21:05 2014 From: hijiangwen at gmail.com (Evan Jiang) Date: Fri, 9 May 2014 22:21:05 +0800 Subject: [Disksim-users] Some questions about some terms like device driver, controller , bus, disk. Thanks Message-ID: Hello, I get some questions about some terms. Looking forward for your reply ,thanks! >From the view of storage system topology, device driver , controller, bus and disk are presented. So I present my understanding: 1 device driver is the system software component that executes on OS 2 controller is the something like SCSI controller embed on PCI board, not inside the disk drive. What the reference manual describes is this kind of controller, not the controller inner disk drive. disksim_controller.c describes it while disksim_diskctlr.c describes the controller circuit inner the disk drive. 3 bus is the system bus or i/o bus. 4 disk, just is the disk drive. I don't know whether I am right. Looking forward for your help! thanks. -------------- next part -------------- An HTML attachment was scrubbed... URL: From hijiangwen at gmail.com Fri May 23 00:33:19 2014 From: hijiangwen at gmail.com (Evan Jiang) Date: Fri, 23 May 2014 12:33:19 +0800 Subject: [Disksim-users] Can any explain what these variables mean? thanks! Message-ID: int struct disk: diskreq *pendxfer; diskreq *currenthda; diskreq *effectivehda; diskreq *currentbus; diskreq *effectivebus; ioreq_event *buswait; ioreq_event *outwait; int struct diskreq int outblkno; int inblkno; Thanks very much! -------------- next part -------------- An HTML attachment was scrubbed... URL: