Package ganeti :: Module bdev

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Module bdev

source code

Block device abstraction

Classes

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BlockDev
Block device abstract class.

LogicalVolume
Logical Volume block device.

DRBD8Status
A DRBD status representation class.

BaseDRBD
Base DRBD class.

DRBD8
DRBD v8.x block device.

FileStorage
File device.

PersistentBlockDevice
A block device with persistent node

Functions

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boolean

_IgnoreError(fn, *args, **kwargs)
Executes the given function, ignoring BlockDeviceErrors.

source code

_ThrowError(msg, *args)
Log an error to the node daemon and the raise an exception.

source code

_CanReadDevice(path)
Check if we can read from the given device.

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FindDevice(dev_type, unique_id, children, size)
Search for an existing, assembled device.

source code

Assemble(dev_type, unique_id, children, size)
Try to attach or assemble an existing device.

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Create(dev_type, unique_id, children, size)
Create a device.

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Variables

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_DEVICE_READ_SIZE = 128* 1024

DEV_MAP = {constants.LD_LV: LogicalVolume, constants.LD_DRBD8:...

Imports: re, time, errno, stat, pyp, os, logging, utils, errors, constants, objects, compat, netutils

Function Details

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_IgnoreError(fn, *args, **kwargs)

source code

Executes the given function, ignoring BlockDeviceErrors.

This is used in order to simplify the execution of cleanup or rollback functions.

Returns: boolean: True when fn didn't raise an exception, False otherwise

_ThrowError(msg, *args)

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Log an error to the node daemon and the raise an exception.

Parameters:

msg (string) - the text of the exception @raise errors.BlockDeviceError

_CanReadDevice(path)

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Check if we can read from the given device.

This tries to read the first 128k of the device.

FindDevice(dev_type, unique_id, children, size)

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Search for an existing, assembled device.

This will succeed only if the device exists and is assembled, but it does not do any actions in order to activate the device.

Assemble(dev_type, unique_id, children, size)

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Try to attach or assemble an existing device.

This will attach to assemble the device, as needed, to bring it fully up. It must be safe to run on already-assembled devices.

Variables Details

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DEV_MAP

Value:

{constants.LD_LV: LogicalVolume, constants.LD_DRBD8: DRBD8, constants.
LD_BLOCKDEV: PersistentBlockDevice,}