| PRIMECLUSTER Global Disk Services Configuration and Administration Guide 4.2 (Linux) |
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Contents
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| Chapter 5 Operation | > 5.2 Settings |
System Disk Settings allows you to mirror system disks.
System disks cannot be mirrored under the following conditions.
Change the disk configuration before performing the system disk settings.
The partitioning method is not the GUID partition table (GPT).
The disk does not have an unused (unassigned to a slice) slice number.
The system disk does not have sufficient free space or a swap area.
For details on necessary free space (or a swap area), refer to "Disk Size."
Disk that will be mirrored by system disk settings
For system disk settings from the GDS Management View, disks with /, /var, /usr, /boot, /boot/efi, and a swap area are recognized as system disks.
Disks that are recognized as system disks will automatically be the original disks for mirroring. Among /, /var, /usr, /boot, /boot/efi, and a swap area, disks with only swap areas can be excluded from mirroring, but disks with /, /var, /usr, /boot, and /boot/efi are always to be mirrored.
Also, physical disks that are not recognized as system disks cannot be mirrored using the [System Disk Settings].
For Safe System Disk Mirroring
To safely mirror the system disk, exit all active applications before proceeding to system disk settings.
During the mirroring process, there may be a considerable degradation of application response time. After completing the system disk settings, promptly reboot the system.
How to mirror a system disk
In the [Settings] menu, select [System Disk Settings].
Confirming original disks
In the [Physical Disk] field, system disks that will be used as original disks will be displayed with a check mark.
For disks with mount information in /etc/fstab, the [Mount Point] field displays their mount points.
Original disks for mirroring with check marks in the [Physical Disk] field are registered as keep disks with the root class and mirrored.
Uncheck system disks not to be registered with the root class.
It is possible to uncheck system disks for which only swap among /, /var, /usr, /boot, /boot/efi and swap is displayed in the [Mount Point] field.
It is impossible to uncheck system disks for which /, /var, /usr, /boot, and /boot/efi are displayed in the [Mount Point] field.
If you do not want to proceed with mirroring, click <Cancel>.
If you want to proceed with mirroring, click <Next>.
Creating root class
Type the class name of the root class.
If the root class is present, the class name cannot be set.
Inputting the Class Name
The class name will be used for the device path name.
/dev/sfdsk/class_name/rdsk/volume_name [Linux2.4]
/dev/sfdsk/class_name/dsk/volume_name
You must be careful when inputting the class name, as once the volume is created, it cannot be changed.
When Setting the System Disk in Cluster System
When setting the system disk in cluster systems, the class name of the root class should be different for each node.
For information on assigning a class name, see "Object Name."
Click <Next> to continue.
Creating group
Create the group by selecting the mirror disks.
When multiple system disks that will be used as original disks exist, perform group creation for every original disk.
Group name, size and mount point will be displayed.
In the [Group Name], an automatically created group name appears as a default.
Change the [Group Name] if necessary.
In the [Group Configuration Disk] field, the original disk you selected will be displayed.
You cannot remove the original disk from the [Group Configuration Disk] field.
From the [Physical Disk List] field, select the mirror disk (i.e. the disk you want to mirror to) and click <Add>. The disk will be added to the [Group Configuration Disk] field.
You can select more than one physical disk at a time.
For mirroring disks, add one or more mirror disks. If no mirror disk is added, the original disk is registered with the root class and managed with GDS but will not be mirrored.
Double-click the [Disk Name] field in the [Group Configuration Disk] field, and change the name.
After adding all disks, click <Next> and create the next group.
Once you finish creating all groups, proceed to register the spare disks.
Physical disks that can be registered as the Group Configuration Disk
GDS Management's system disk settings does not allow you to add a physical disk that is smaller than the original disk.
Users should always add a physical disk that is larger than the original disk.
Registering spare disk
To register a spare disk, select the physical disk you want to set as a spare disk from the [Physical Disk List], and click <Add>.
Existing spare disks in the root class cannot be removed from the [Spare Disk] field.
After finishing the registration, click <Next>.
When you do not need to register a spare disk, no setting is necessary. Just click <Next>.
Spare Disk Size
The hot spare function will not operate when there is not sufficient space on a spare disk to copy the configuration of volume in mirror group. Define the largest disk within the class as the spare disk.
Confirming system disk configuration
Confirm the system disk configuration.
In the [Physical Disk] field, the original disk will be displayed, and in the [Mirror Disk] field, the mirror disk will be displayed.
When mount information of a slice contained in physical disk is set for /etc/fstab, mount point will be displayed in the [Mount Point] field.
Click <Create> to continue.
Automatically-generated Volume Names
The following volume names are automatically-generated when setting the system disk.
When mount information is set for /etc/fstab, the name will be mount point + "Volume." (e.g. usrVolume) However, root partition will be rootVolume.
When mount information is not set for /etc/fstab, the name will be "Volume" + number. (e.g. Volume0001)
Completing system disk configuration
Confirm that the system disk configuration is complete, and click <OK>.
These system disk settings will be in effect after the system is rebooted. Click <OK> and reboot the system immediately.
JRM and System Disk Settings
JRM (Just Resynchronization Mechanism) for a volume created by system disk settings will be set as "Yes." To disable the JRM feature, select the volume in the Main screen and change the attribute by clicking [Change Attributes] in the [Operation] menu.
Checking Physical Disk Information and Slice Numbers
After rebooting the system, check physical disk information and the slice numbers of system disks and make a note of them. For details, refer to "Checking Physical Disk Information and Slice Numbers."
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