>
> *to be able to boot the machine with one disk down
> set md:mirrored_root_flag=1
>
Clairement si ce paramêtre n'est pas explicitement mis à 1 un disque
système
(partition root raidée en mirroir avec 2 disques ne peut pas rebooter si
l'un des deux disques est mort).
Ce que je trouve inquiétant c'est ce que dit la doc au sujet de ce
paramêtre (son
utilisation n'est pas supportée !!!!).
Aussi soit on l'utilise et Sun en cas de problème dira que ce n'est pas
supporté, soit on ne l'utilise pas et que faut-il faire alors si un
disque root en mirroir est HS ?
=====
md:mirrored_root_flag
Description
Overrides Solaris Volume Manager requirements for replica quorum
and forces Solaris Volume Manager to start if any valid state
database replicas are available.
The default value is disabled, which requires that a majority of
all replicas are available and synchronized before Solaris
Volume Manager will start.
Data Type
Boolean values
Default
0 (disabled)
Range
0 (disabled) or 1 (enabled)
Dynamic?
No
Validation
None
When to Change
Use of this parameter is not supported.
Some people using Solaris Volume Manager accept the risk of
enabling this parameter if all three of the following conditions
apply:
* When root (/) or other system-critical file systems are
mirrored
* Only two disks or controllers are available
* An unattended reboot of the system is required
If this parameter is enabled, the system might boot with a stale
replica that inaccurately represents the system state (including
which mirror sides are good or in Maintenance state). This
situation could result in data corruption or system corruption.
Change this parameter only if system availability is more
important than data consistency and integrity. Closely monitor
the system for any failures. You can mitigate the risk by
keeping the number of failed, Maintenance, or hot-swapped
volumes as low as possible.
For more information about state database replicas, see Chapter
6, State Database (Overview),in Solaris Volume Manager
Administration Guide.
Commitment Level
Unstable
--
Christian Pélissier
Office National d'Études et de Recherches Aérospatiales
BP 72 92322 Chatillon
Tel: 33 1 46 73 44 19, Fax: 33 1 46 73 41 50
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