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Full Discussion: Solaris 10 swap device and filesystem
Operating Systems Solaris Solaris 10 swap device and filesystem Post 302977640 by javanoob on Wednesday 20th of July 2016 07:47:57 PM
Old 07-20-2016
Quote:
Originally Posted by MadeInGermany
Q1) Problem: the swap would trash the filesystem!

BTW my personal thumb formula is: swap-GB = 4 x SQRT(RAM-GB)

Q2) No, can be any size.

Q3) The larger the used swap, the lower is the paging to/from the swap. The unused swap does not matter for performance (but is wasted disk space).
Hi MadeInGermany

Thanks for your reply.
Quote:
Q1) Problem: the swap would trash the filesystem!
Q1) Do you mean that there will be a problem if i use a partition with an existing UFS filesystem as the swap device ? or do actually you mean "No problem" ?

Quote:
swap-GB = 4 x SQRT(RAM-GB)
Q2) That would be 4 x SQRT(128GB) = 4 x 11.31 = around 48GB ?

Quote:
Q3) The larger the used swap, the lower is the paging to/from the swap. The unused swap does not matter for performance (but is wasted disk space).
Q3) Can you elaborate abit further here ? - The "used" swap here means "allocated" swap or really "utilized" swap. I thought when memory is insufficient, paging to/from swap will occur. So how does having a big swap reduce paging ?

Last but not least, is it okay for me to use my 100GB partition with UFS filesystem as my new swap device ? - as I do not want to re-partition the harddisk and affect the rest of my partitions

p.s. initially i allocate 32GB of swap for my 128GB ram, but oracle's grid installation for database suggest 0.75(RAM) for swap, and hence i am trying to use an existing partition (100GB) as the actual swap device

Hope to hear from you soon.
 

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LEARN ABOUT DEBIAN

swap-offset

SWAP-OFFSET(8)							    swap-offset 						    SWAP-OFFSET(8)

NAME

       swap-offset - program to calculate the offset of a swap file in a partition

SYNOPSIS

       swap-offset [<swap_file>]

DESCRIPTION

       This manual page documents briefly the swap-offset.

       This manual page was written for the Debian(TM) distribution because the original program does not have a manual page.

       The programs s2disk and s2both can be used to save the state of the whole system to a swap partition or file and power off or suspend your
       system. After restarting your system it will be put back in the exact system state you left it (this is sometimes called hibernation).

       In the case of using a swap file you will have to specify the location of the swap file's header as the offset from the beginning of the
       partition that contains the swap file. The swap-offset utility can be used to determine this value.

SEE ALSO

       uswsusp.conf(8), s2disk(8)

       For more information see the HOWTO and the README

AUTHOR

       This manual page was written by Tim Dijkstra tim@famdijkstra.org for the Debian(TM) system (but may be used by others). Permission is
       granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version
       published by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

AUTHOR

       TimTim DijkstraDijkstra <tim@famdijkstra.org> <tim@famdijkstra.org>
	   Wrote this manpage for the Debian system.

COPYRIGHT

       Copyright (C) 2006 Tim Dijkstra

uswsusp 							   juni 24, 2006						    SWAP-OFFSET(8)
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