I see inconsistent data when printing table. It shoud be: Number Start End Size File system Name Flags 1 0cyl 121600cyl** 121601cyl* zfs 9 121600cyl** 121601cyl 2cyl*
* Starting cylinder should be the first cylinder and count in the amount ** Strange ending at same cylinder that other partition begins. The problem may be partitions aren't created in cylinders (but sectors), and you try to calculate numbers based on a worng unit now. On 30/01/16 21:48, Chris Johnson wrote: > Hi, > > I need some education on how parted is doing math. ;-) > > The drive is 1 TB. > > # parted /dev/rdsk/c7t1d0p0 > GNU Parted 2.3.0 > Using /dev/rdsk/c7t1d0p0 > Welcome to GNU Parted! Type 'help' to view a list of commands. > (parted) unit cyl > unit cyl > (parted) p > p > Model: Generic Ide (ide) > Disk /dev/rdsk/c7t1d0p0: 121601cyl > Sector size (logical/physical): 512B/512B > BIOS cylinder,head,sector geometry: 121601,255,63. Each cylinder is 8225kB. > Partition Table: gpt > > Number Start End Size File system Name Flags > 1 0cyl 121600cyl 121600cyl zfs > 9 121600cyl 121601cyl 1cyl > > * > Question 1)* > > Based on the parted value 8225KB per cylinder, I would think that > sectors per cylinder could be calculated thus > > 8225 KB/cyl * 1024 Bytes/KB = 8422400 Bytes/cyl > > and 8422400 Bytes/cyl / 512 Bytes/sector = 16450 sectors per cylinder > > However, I would also think that sectors per cylinder could be > calculated thus: > > > > 255 * 63 = 16065 sectors per cylinder > > Obviously these numbers do not match. > > Just for the heck of it, in case when parted says 1 KB it means 1,000 > bytes not 1,024 bytes, I did this math. > > 8225 * 1000 = 8225000 / 512 = 16064.4531 sectors per cylinder > > which is certainly closer to the value you get from 255 * 63 but it > really doesn't make any sense to me to be thinking that we are getting a > fractional number of sectors in a given cylinder. > > > Thanks for your insight.
