La commande 'tunsave' permet de sauvegarde les paramètres systèmes courant dans un fichier.
La syntaxe est la suivante : "# tunsave [ -a | -A ] -f | -F Filename [ -d Description ]"
Pour sauvegarder la configuration actuelle, il suffira alors de taper :
# tunsave -f maconfig
Des options permetent de préciser quelles variables doivent être sauvegardées ou non.
Ainsi, la commande 'tunsave -a -f /tmp/maconfig'
sauvegarde les valeurs des variables système dans le fichier /tmp/maconfig y compris les valeurs par défaut, mais dans ce cas, la valeur est remplacée par la chaine 'DEFAULT'.
La commande 'tunsave -A -f /tmp/maconfig2' va sauvegarder toutes les valeurs définies mais avec un commentaire 'DEFAULT VALUE' quand il s'agit de la valeur de base.
Ci-dessous la syntaxe officielle IBM
tuncheck Command
Purpose
Validates a tunable file.
Syntax
tuncheck [ -r | -p ] -f Filename
Description
The tuncheck command validates a tunable file. All tunables listed in the specified file are checked for range and dependencies.
If a problem is detected, a warning is issued.
There are two types of validation:
against the current context
Checks to see if Filename could be applied immediately. Tunables not listed in Filename are interpreted as current values.
The checking fails if a tunable of type Incremental is listed with a smaller value than its current value; it also fails if
a tunable of type Bosboot or Reboot is listed with a different value than its current value.
against the next boot context
Checks to see if Filename could be applied during a reboot, that is, if it could be a valid nextboot file. Decreasing a
tunable of type Incremental is allowed. If a tunable of type Bosboot or Reboot is listed with a different value than its
current value, a warning is issued but the checking does not fail.
Additionally, warnings are issued if Filename contains unknown stanzas, or unknown tunables in a known stanza. However, that does
not make the checking fail.
Upon success, the AIX_level, Kernel_type and Last_validation fields in the info stanza of the checked file are updated.
Flags
Item
Description
-f Filename
Specifies the name of the tunable file to be checked. If it does not contain the '/' (forward slash) character, the name is
relative to /etc/tunables.
-p
Checks Filename in both current and boot contexts. This is equivalent to running tuncheck twice, one time without any flag
and one time with the -r flag.
-r
Checks Filename in a boot context.
If -p or -r are not specified, Filename is checked according to the current context.
Tuning Parameter Types
Item
Description
Dynamic
Can be changed at any time.
Static
Can never be changed
Reboot
Can only be changed during the reboot sequence
Bosboot
Can only be changed by running bosboot and rebooting the machine
Mount
Changes made are only effective for future filesystems or directory mountings
Incremental
Can only be incremented, except at boot time.
Connect
Changes are only effective for future socket connections.
Exit Status
0
Filename is valid.
>0
Filename is invalid, message have been provided.
Examples
1 To check whether mytunable can be applied immediately, type:
tuncheck -f ./mytunable
2 To check whether /etc/tunables/nextboot can be applied during a reboot, type:
tuncheck -r -f nextboot
3 To check whether /etc/tunables/nextboot can be applied immediately and after a reboot, type:
tuncheck -p -f nextboot
Files
Item
Description
/usr/sbin/tuncheck
Contains the tuncheck command.
/etc/tunables
Contains all the tunable files.
