04-25-2008
Calculating Drive Space Increase
I trying to calculate drive space with RAID. I know the equation is:
(n-1)/n * drive capacity
but, when I use that my calculations don't come out when I compare to what I already know exists:
I have 3 - 18.2gb SCSI drives that contain two logical drives C & D.
Using the math, (3-1)/3 * 18.2 = 12.1gb usable space per drive.
C has:
9.76gb
D has: 24.1gb
Drive D works out just fine but the C drive should have 12.1gb usable. I am so confused.
I need to know how to get the right numbers because my boss wants to know how much gain would come from intalling two additional 18.2gb drives.
Is there something I am missing?? I have researched 'til my eyes hurt because until a week ago, I haven't had to deal with calculating hard drive upgrades and such since my first year of college. HELP!!
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LEARN ABOUT SUSE
sdl_cdopen
SDL_CDOpen(3) SDL API Reference SDL_CDOpen(3)
NAME
SDL_CDOpen - Opens a CD-ROM drive for access.
SYNOPSIS
#include "SDL.h"
SDL_CD *SDL_CDOpen(int drive);
DESCRIPTION
Opens a CD-ROM drive for access. It returns a SDL_CD structure on success, or NULL if the drive was invalid or busy. This newly opened CD-
ROM becomes the default CD used when other CD functions are passed a NULL CD-ROM handle.
Drives are numbered starting with 0. Drive 0 is the system default CD-ROM.
EXAMPLES
SDL_CD *cdrom;
int cur_track;
int min, sec, frame;
SDL_Init(SDL_INIT_CDROM);
atexit(SDL_Quit);
/* Check for CD drives */
if(!SDL_CDNumDrives()){
/* None found */
fprintf(stderr, "No CDROM devices available
");
exit(-1);
}
/* Open the default drive */
cdrom=SDL_CDOpen(0);
/* Did if open? Check if cdrom is NULL */
if(!cdrom){
fprintf(stderr, "Couldn't open drive: %s
", SDL_GetError());
exit(-1);
}
/* Print Volume info */
printf("Name: %s
", SDL_CDName(0));
printf("Tracks: %d
", cdrom->numtracks);
for(cur_track=0;cur_track < cdrom->numtracks; cur_track++){
FRAMES_TO_MSF(cdrom->track[cur_track].length, &min, &sec, &frame);
printf(" Track %d: Length %d:%d
", cur_track, min, sec);
}
SDL_CDClose(cdrom);
SEE ALSO
SDL_CD, SDL_CDtrack, SDL_CDClose
SDL
Tue 11 Sep 2001, 22:58 SDL_CDOpen(3)