06-13-2002
Opinion - There is no real general rule - it matters what you are using the system for. If you are using it for email, then you want to insure you create a big slice for email (so it isn't on the / partition) and probably a relatively big slice for log files.
Each OS has it's own sizes needed for the different partitions . Also realize upgrades of the OS will normally get bigger (requiring more space) - put in a buffer so you don't have to re-format it every time you upgrade.
Each SysAdmin does it differently - each has reasons for it. Sometimes it's valid - others - who knows. You really just have to take it in stride - the more you learn the better you get at figuring out it is only a small thing -
There was once one admin who set up everything to just fit - adding maybe 5% to each required space amount - why?
So when the server filled up disk space, he could get bigger disks or could rebuild it - leaving him in a position of savior. No one questioned that he could have fixed the problem. Kept him employed in the same small company for years and years.
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cmdk(7D) Devices cmdk(7D)
NAME
cmdk - common disk driver
SYNOPSIS
cmdk@target, lun : [ partition | slice ]
DESCRIPTION
The cmdk device driver is a common interface to various disk devices. The driver supports magnetic fixed disks and magnetic removable
disks.
The block-files access the disk using the system's normal buffering mechanism and are read and written without regard to physical disk
records. There is also a "raw" interface that provides for direct transmission between the disk and the user's read or write buffer. A sin-
gle read or write call usually results in one I/O operation; raw I/O is therefore considerably more efficient when many bytes are transmit-
ted. The names of the block files are found in /dev/dsk; the names of the raw files are found in /dev/rdsk.
I/O requests to the magnetic disk must have an offset and transfer length that is a multiple of 512 bytes or the driver returns an EINVAL
error.
Slice 0 is normally used for the root file system on a disk, slice 1 as a paging area (for example, swap), and slice 2 for backing up the
entire fdisk partition for Solaris software. Other slices may be used for usr file systems or system reserved area.
Fdisk partition 0 is to access the entire disk and is generally used by the fdisk(1M) program.
FILES
/dev/dsk/cndn[s|p]n block device (IDE)
/dev/rdsk/cndn[s|p]n raw device (IDE)
where:
cn controller n
dn lun n (0-7)
sn UNIX system slice n (0-15)
pn fdisk partition(0)
/kernel/drv/cmdk 32-bit kernel module.
/kernel/drv/amd64/cmdk 64-bit kernel module.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Architecture |x86 |
+-----------------------------+-----------------------------+
SEE ALSO
fdisk(1M), mount(1M), lseek(2), read(2), write(2), readdir(3C), scsi(4), vfstab(4), attributes(5), dkio(7I)
SunOS 5.10 9 Oct 2004 cmdk(7D)