not all data in the filesystem cache is held by processes, as long as there is no need to drop these pages because of computational pages, they are kept in the cache
to tune the filesystem cache, you may want to take a look at these vmo parameters:
Code:
numperm%
Defines the current size of the persistent file cache.
minperm%
Defines the minimum amount of RAM the persistent file cache may occupy. If numperm% is less than or equal to minperm%, file pages will not be stolen when RAM is required.
maxperm%
Defines the maximum amount of RAM the persistent file cache may occupy before it is used as the sole source of new pages by the page stealing algorithm. By default, numperm%
may exceed maxperm% if there is free memory available. The setting strict_maxperm may be set to one to change maxperm% into a hard limit, guaranteeing numperm% will never exceed maxperm%.
strict_maxperm
As above, if set to 1, changes maxperm% into a hard limit.
numclient%
Defines the current size of the client file cache.
maxclient%
Defines the hard maximum size of the client file cache.
strict_maxclient
Introduced in 5.2 ML4, allows the changing of maxclient% into a soft limit, similar to strict_maxperm.
lru_file_repage
Introduced in AIX 5.2 ML4 and AIX 5.3 ML1, this influences the VMM page stealing algorithm. If set to 0, the algorithm will strongly prefer stealing file pages to satisfy memory requests.
We have an IBM Power 710. It has a USB port on the front. I have done some searching and see that there is information out there on how to create a JFS2 file system on USB drives. A few have commented that they would not recommend it, if the server is important, may crash the server... Just... (0 Replies)
Can someone please help me understand what it is I am doing incorrectly?
I have 22 PVs (disks) assigned to a VG, the stats on the disks:
# lspv hdisk1
PHYSICAL VOLUME: hdisk1 VOLUME GROUP: vg_usr1
PV IDENTIFIER: 0000150179158027 VG IDENTIFIER ... (3 Replies)
I am trying to set a dynamic PS1 that will change its content no matter what the user does. But I am finding that the shell variables I put in it do not get refreshed.
One simple example of what I mean :
PS1="$HOSTNAME:$USER $PWD > "
if the user changes directory, the PWD variable is not... (2 Replies)
Hi,
is anyone aware about filesystem size restrictions on AIX? And does anyone know a solution for below problem?
I have 2 boxes attached to EMC Raid5 storage, both have huge /optware/oracle/oradata filesystems - 4.5 and 2.5 TB in size, nothing is striped or in any other way restricted. Due to... (11 Replies)
We are using AIX 5.2 using jfs2 almost all excpt one mount.
Is it possible for a non root user id to mount one file system without journaling turned on, perform some activities and then remount (un-mount and mount) the same file system again.
Please advise if this is possible
Thanks (2 Replies)
Hi Every body,
I created Volume Group & FileSystem of type JFS2 with size 1.3 TB on AIX 5.2.
I want to import this VG on another system AIX 4.3. It is imported successfully & I can varyon the VG but unfourtantly I couldn't mount the FileSystem. Is it possible to mount a JFS2 FileSystem on AIX... (3 Replies)
hi all,
can sumbody give me a link which gives the basic layout of JFS, JFS2 and the veritas file system.
and i also want to know about the data structures used in this filsystem
thanx in advance (0 Replies)
