Package ganeti :: Package utils :: Module storage

Module storage

Utility functions for storage.

Functions

GetDiskTemplatesOfStorageType(storage_type)
Given the storage type, returns a list of disk templates based on that storage type.

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GetLvmDiskTemplates()
Returns all disk templates that use LVM.

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IsDiskTemplateEnabled(disk_template, enabled_disk_templates)
Checks if a particular disk template is enabled.

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IsFileStorageEnabled(enabled_disk_templates)
Checks if file storage is enabled.

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IsSharedFileStorageEnabled(enabled_disk_templates)
Checks if shared file storage is enabled.

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IsLvmEnabled(enabled_disk_templates)
Check whether or not any lvm-based disk templates are enabled.

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LvmGetsEnabled(enabled_disk_templates, new_enabled_disk_templates)
Checks whether lvm was not enabled before, but will be enabled after the operation.

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string

_GetDefaultStorageUnitForDiskTemplate(cfg, disk_template)
Retrieves the identifier of the default storage entity for the given storage type.

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(string, string)

_GetDefaultStorageUnitForSpindles(cfg)
Creates a 'spindle' storage unit, by retrieving the volume group name and associating it to the lvm-pv storage type.

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list of tuples (string, string)

GetStorageUnitsOfCluster(cfg, include_spindles=False)
Examines the cluster's configuration and returns a list of storage units and their storage keys, ordered by the order in which they are enabled.

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tuple

LookupSpaceInfoByStorageType(storage_space_info, storage_type)
Looks up the storage space info for a given storage type.

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Imports: logging, constants

Function Details

[hide private]

_GetDefaultStorageUnitForDiskTemplate(cfg, disk_template)

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Retrieves the identifier of the default storage entity for the given storage type.

Parameters:

cfg (objects.ConfigData) - the configuration data
disk_template (string) - a disk template, for example 'drbd'

Returns: string

identifier for a storage unit, for example the vg_name for lvm storage

_GetDefaultStorageUnitForSpindles(cfg)

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Creates a 'spindle' storage unit, by retrieving the volume group name and associating it to the lvm-pv storage type.

Returns: (string, string): tuple (storage_type, storage_key), where storage type is 'lvm-pv' and storage_key the name of the default volume group

GetStorageUnitsOfCluster(cfg, include_spindles=False)

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Examines the cluster's configuration and returns a list of storage units and their storage keys, ordered by the order in which they are enabled.

Parameters:

cfg (config.ConfigWriter) - Cluster configuration
include_spindles (boolean) - flag to include an extra storage unit for physical volumes

Returns: list of tuples (string, string)

list of storage units, each storage unit being a tuple of (storage_type, storage_key); storage_type is in constants.STORAGE_TYPES and the storage_key a string to identify an entity of that storage type, for example a volume group name for LVM storage or a file for file storage.

LookupSpaceInfoByStorageType(storage_space_info, storage_type)

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Looks up the storage space info for a given storage type.

Note that this lookup can be ambiguous if storage space reporting for several units of the same storage type was requested. This function is only supposed to be used for legacy code in situations where it actually is unambiguous.

Parameters:

storage_space_info (list of dicts) - result of GetNodeInfo
storage_type (string) - a storage type, which is included in the storage_units list

Returns: tuple

returns the element of storage_space_info that matches the given storage type