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Strange Note in Solaris manual

 
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Old 02-19-2013
Oracle Strange Note in Solaris manual
Hello!

In document "Advanced System Administrationfor the Solaris™ 10Operating SystemSA-
202-S10"
(Solaris 10 Advanced System Administration(SA-202-S10))

I found that:


To view the current swap space allocation, complete the following steps:
1. List a summary of the system's virtual swap space.
Code:
 
# swap -s
total: 218096k bytes allocated + 20432k reserved = 238528k used, 4174456k available

2. List the details of the system's physical swap areas.
Code:
 
# swap -l
swapfile dev swaplo blocks free
/dev/dsk/c0t0d0s1 136,9 16 8392544 8350448

Note - There can be a discrepancy in available and free swap space size between the
swap -s and swap -l outputs. The swap -s output does not take into account pre-allocated swap space that has not yet been used by a process.


As I understand, pre-allocated swap space is a reserved swap space. swap -l shows only swap devices itself, like swap slices and swap files. Swap -s takes into account all swapfs controlled area, i.e. physical RAM+swap slices+swap files.
What does this note means?
 
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