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Full Discussion: Is swap and Shared memory the same ?
Top Forums UNIX for Dummies Questions & Answers Is swap and Shared memory the same ? Post 302815171 by kraljic on Friday 31st of May 2013 05:56:41 AM
Old 05-31-2013
Info you've asked for

Code:
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.4 (Tikanga)

# uname -a
Linux stomper189 2.6.18-164.el5 #1 SMP Tue Aug 18 11:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux


# mount
/dev/mapper/rootvg-rootvol on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/mapper/rootvg-varvol on /var type ext3 (rw,nosuid)
/dev/mapper/rootvg-homevol on /home type ext3 (rw,nosuid)
/dev/mapper/rootvg-sharedvol on /shared type ext3 (rw,nosuid)
/dev/sda1 on /boot type ext3 (rw,nosuid)
tmpfs on /dev/shm type tmpfs (rw,nosuid)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
/dev/mapper/datavg-prodloadvol on /pkms/prod/load type ext3 (rw)
/dev/mapper/datavg-crmprodloadvol on /crm/prod/load type ext3 (rw)
/dev/mapper/datavg-dboraclevol on /db/oracle type ext3 (rw)
/dev/mapper/datavg-pkmsarchive on /pkms/pkmsdb/archive type ext3 (rw)
/dev/mapper/datavg-pkmssystem on /pkms/pkmsdb/system type ext3 (rw)
/dev/mapper/datavg-pkmstbsdata01 on /pkms/pkmsdb/dbs/tbs_data01 type ext3 (rw)
/dev/mapper/datavg-pkmstbsindexvol on /pkms/pkmsdb/dbs/tbs_index01 type ext3 (rw)
/dev/mapper/datavg-crmtbsdata01 on /crm/crmdb/dbs/tbs_data01 type ext3 (rw)
/dev/mapper/datavg-crmtbsindexvol on /crm/crmdb/dbs/tbs_index01 type ext3 (rw)
/dev/mapper/datavg-dbcontrolvol on /db/control type ext3 (rw)
/dev/mapper/datavg-dbadminvol on /db/admin type ext3 (rw)
/dev/mapper/datavg-dbredovol on /db/redo type ext3 (rw)
/dev/mapper/datavg-tempvol on /temp type ext3 (rw)
/dev/mapper/datavg-pkmsfivol on /data/pkmsfi type ext3 (rw)
/dev/mapper/datavg-pkmsd01vol on /pkms/d01 type ext3 (rw)
/dev/mapper/datavg-crmd01vol on /crm/d01 type ext3 (rw)
/dev/mapper/datavg-datacrmdfvol on /usr/oracle type ext3 (rw)

 

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LEARN ABOUT HPUX

remote_nfs_swap

remote_nfs_swap(5)						File Formats Manual						remote_nfs_swap(5)

NAME

       remote_nfs_swap - enable swapping across NFS

VALUES

   Default
   Allowed values
DESCRIPTION

       This  tunable  controls adding a NFS filesystem for use as swap.  If is set to only local filesystems and devices can be used for swap.	If
       it is set to both local and networked file systems can be used for swap.

       Historically, this tunable was used in NFS clusters that are no longer supported, but this capability has not yet been removed.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect on the next boot.

   When Should the Tunable Be Turned On?
       Almost never.  As previously mentioned, this tunable was designed for systems which are not in use  today.   Only  systems  with  extremely
       robust NFS capabilities should even consider using NFS for swap.

   What Are the Side Effects of Turning the Tunable On?
       If  the	value  is  set to and a NFS partition is added as swap, then some kernel memory will be set aside for NFS transactions to the swap
       file system.  The kernel will then use the NFS swap partition just the same as a local file system.  If the NFS capabilities of the  system
       are  not  robust,  this	could lead to extremely long swap times (both swap in and swap out), and possibly a loss of memory because all the
       reserved memory and more could be used by NFS (just when memory pressure is high) causing the need for swap.

   When Should the Tunable Be Turned Off?
       Unless you are positive that the NFS system can handle the load of being used as swap, and does not have a local file system or disk  drive
       to spare, this tunable should be set to

   What Are the Side Effects of Turning the Tunable Off?
       Any  previously	defined  NFS  swap  filesystems will no longer be allowed.  Kernel memory will not be reserved for NFS transactions due to
       swap.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases	of
       HP-UX.

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters						remote_nfs_swap(5)
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