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Full Discussion: Memory usage in AIX server
Operating Systems AIX Memory usage in AIX server Post 302843467 by zaxxon on Tuesday 13th of August 2013 11:56:39 AM
Old 08-13-2013
  1. Yes, thatīs totally normal. Most RAM is being used to cache files so access to slower disks can be hopefully avoided.
  2. Correct, see 1. It depends on your tuning parameters when and how much memory will be freed. Usually from AIX 5.3 TL... (forgot it), the tuning parameters for VMM are good and usually donīt need adjustment.
  3. If your system actually does page out to Paging Space or page in from there, it will be very slow. So either by tuning or enough memory, you will try to avoid paging at all cost. Therefore these days, you can use a fix amount of Paging Space, which may be rather small compared to RAM. I would use a fix size of 5 GB.
 

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vxfs_ifree_timelag(5)						File Formats Manual					     vxfs_ifree_timelag(5)

NAME
vxfs_ifree_timelag - VxFS inode free time lag (specifies the minimum time to be spent on a freelist) SYNOPSIS
VALUE
Specify an integer value. Minimum None Maximum None Default 0 DESCRIPTION
In VxFS, the unused inodes are put on a freelist. The memory space for this unused inode is freed if it stays on the freelist for a speci- fied amount of time. The tunable specifies the minimum amount of time should spend on a freelist before its memory space is freed. The time is specified in seconds. is a dynamic tunable. Any changes to take effect immediately. EXAMPLES
Change the value of to 2400 seconds: WARNING
Incorrect tuning of may adversely affect system performance. All HP-UX kernel tunable parameters are release specific. This parameter may be removed or its meaning may change in the 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 SEE ALSO
kctune(1M), vx_maxlink(5), vx_ninode(5), vxfs_bc_bufhwm(5). Tunable Kernel Parameters vxfs_ifree_timelag(5)
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