Re: Virtual Memory

mehaboob@xxxxxxxxx wrote:
Thanks for the reply.

From "man swapinfo"

"Paging space residing on a mass storage device,either taking up the
entire device or, if the device contains a file system, taking up the
space between the end of the file system and the end of the device.
This space is exclusively reserved for paging, and even if it is not
being used for paging, it cannot be used for any other purpose. Device
paging areas typically provide the fastest paging."

My questions
1)"mass storage device" refers to Hard Disk?
2)device refers to Hard Disk?


Mass storage device refers to... well... mass storage device.

A hard disk is a mass storage device, certainly -- but so is a
RAID array of hard disks. If your machine has only hard drives
hanging off of SCSI buses then for you they're synonymous.
But a Logical volume under LVM is also a mass storage device
[but may be many drives], etc.

By the way -- given that you're asking about swapinfo and you
were earlier inquiring about memory -- I'd like to point out
that the "memory" line in swapinfo is "memory swap" aka
"pseudoswap"... which is basically an accounting trick used
by the kernel swap reservation management so you don't need
tons of device or FS swap on machines where the working set
(how much virtual address space is consumed by everything
running) fits in memory (RAM). It is not equivalent to actual
RAM (either in total or in real consumption..)

Don
.

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