Disk and Storage from the start.

hpmysql

Physical Level:Sectors:the building block. (Also called blocks) (512 bytes) = 0.5 KB.Track: a circle of sectors.Cylinder: A stack of tracks.Logical Level:Slices = Partitions.Slices are groupings of cylinders.OS Level (Solaris)Naming and Directory ConventionA disk is divided into 8 slices from 0 to 7.By convention, slice 2 represent the entire disk. A slice is defined by the starting and ending cylinder number. A slice is identified by eight charaters stringcx : the controller number. the HBA card. tx  : the target number.  the hardware address assigned to each disk drive. (usually target 6 meaning the CD/DVD drive)(also referes to SCSI ID)dx : the disk number. The logical unit number. The number of disks at target location.sx : the slice number ranging from 0 to 7./device:  physical device names. /dev    :  logical device names. cxtxdxsx             each physical device will have an entry in both: (This is what OS would use.)/dev/dsk : block device (What the OS operates on, block sizes are 8K for ufs.)/dev/rdsk: character device  (or called Raw devices)respectively. View and Administration of Disks:view: 1. /etc/path_to_inst2. prtconf3. format (Very Useful!)check devices and their partition table. System hardware changes:touch /reconfigurereboot.devfsadm : dynamically configure the system without rebooting.(updates the /path_to_inst, /device, /dev/dsk and /dev/rdsk). devfsadm -c : specific device classdevfsadm -i  : specific driver.devfsadm -C : cleanup the information for those destoried devices.

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