On Sun, 20 Jul 2008, ak wrote:
> I dont understand clearly what is disk slice partition. How to do this?
Partitioning can be a very confusing concept, agreed.
It's best to think of it as a hierarchical (tree-structured) way of
subdividing the space on a physical disk. Like this:
DISK
|
+---> partition 1
|
+---> partition 2
.
.
.
+---> partition N
This is a depth-one partitioning scheme.
You can "extend" that to:
DISK
|
+---> partition 1 ("extended")
| |
| +-> extended (sub-)partition (N+1)
| +-> extended (sub-)partition (N+2)
| .
| +-> extended (sub-)partition (N+M)
|
+---> partition 2
.
.
.
+---> partition N
You can also "slice" it to:
DISK
|
+---> partition 1 ("container" VTOC)
| |
| +-> slice (1)
| +-> slice (2)
| .
| +-> slice (M)
|
+---> partition 2
.
.
.
+---> partition N
You can have combinations of the two of the sort:
DISK
|
+---> partition 1 ("extended")
| |
| +-> extended (sub-)partition (N+1)
| +-> extended (sub-)partition (N+2)
| .
| +-> extended (sub-)partition (N+M)
|
+---> partition 2 ("container" VTOC)
| |
| +-> slice (1)
| +-> slice (2)
| .
| +-> slice (K)
.
.
.
+---> partition N
And if you happen to use a logical volume manager like Solaris SVM or
Linux LVM, you can even have something like:
DISK
|
+---> partition 1 ("extended")
| |
| +-> extended (sub-)partition (N+1)
| | (Linux LVM physical)
| | |
| | +-----> LVM logical 1
| | .
| | +-----> LVM logical x
| |
| +-> extended (sub-)partition (N+2)
| .
| +-> extended (sub-)partition (N+M)
|
+---> partition 2 ("container" - VTOC)
| |
| +-> slice (1)
| | (Solaris SVM subdisk)
| | |
| | +-----> SVM softpartition 1
| | .
| | +-----> SVM softpartition y
| |
| +-> slice (2)
| .
| +-> slice (K)
.
.
.
+---> partition N
The names of the subdividing units are different depending on the scheme
used - and so are the exact data structures that are written to the disk
to indicate the subdivisions. I.e. "extended partitions" use different
data structures than "volumes" which use different data structures than
"slices".
This causes a lot of naming confusion, agreed; in the end, it's an
administrative detail. The above schematic diagrams hopefully make it a
bit clearer ?
(As far as the question goes, "what is allowed/acceptable", that's more
involved not sure I'll have enough time to write that up anywhen soon)
Best regards,
FrankH.
>
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