Package ganeti :: Module bdev :: Class LogicalVolume

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Class LogicalVolume

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Logical Volume block device.

Instance Methods

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__init__(self, unique_id, children, size)
Attaches to a LV device.

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Remove(self)
Remove this logical volume.

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Rename(self, new_id)
Rename this logical volume.

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Attach(self)
Attach to an existing LV.

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Assemble(self)
Assemble the device.

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Shutdown(self)
Shutdown the device.

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objects.BlockDevStatus

GetSyncStatus(self)
Returns the sync status of the device.

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Open(self, force=False)
Make the device ready for I/O.

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Close(self)
Notifies that the device will no longer be used for I/O.

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Snapshot(self, size)
Create a snapshot copy of an lvm block device.

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SetInfo(self, text)
Update metadata with info text.

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Grow(self, amount)
Grow the logical volume.

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Inherited from BlockDev: CombinedSyncStatus, GetActualSize, SetSyncSpeed, __repr__

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Methods

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Create(cls, unique_id, children, size)
Create a new logical volume.

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list

GetPVInfo(cls, vg_names, filter_allocatable=True)
Get the free space info for PVs in a volume group.

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list

GetVGInfo(cls, vg_names, filter_readonly=True)
Get the free space info for specific VGs.

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_ValidateName(cls, name)
Validates that a given name is valid as VG or LV name.

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Static Methods

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_GetVolumeInfo(lvm_cmd, fields)
Returns LVM Volumen infos using lvm_cmd

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Class Variables

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_VALID_NAME_RE = re.compile("^[a-zA-Z0-9+_.-]*$")

_INVALID_NAMES = frozenset([".", "..", "snapshot", "pvmove"])

_INVALID_SUBSTRINGS = frozenset(["_mlog", "_mimage"])

Properties

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Inherited from object: __class__

Method Details

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init(self, unique_id, children, size)
(Constructor)

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Attaches to a LV device.

The unique_id is a tuple (vg_name, lv_name)

Overrides: object.__init__

Create(cls, unique_id, children, size)
Class Method

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Create a new logical volume.

Overrides: BlockDev.Create

_GetVolumeInfo(lvm_cmd, fields)
Static Method

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Returns LVM Volumen infos using lvm_cmd

Parameters:

lvm_cmd - Should be one of "pvs", "vgs" or "lvs"
fields - Fields to return

Returns:

A list of dicts each with the parsed fields

GetPVInfo(cls, vg_names, filter_allocatable=True)
Class Method

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Get the free space info for PVs in a volume group.

Parameters:

vg_names - list of volume group names, if empty all will be returned
filter_allocatable - whether to skip over unallocatable PVs

Returns: list

list of tuples (free_space, name) with free_space in mebibytes

GetVGInfo(cls, vg_names, filter_readonly=True)
Class Method

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Get the free space info for specific VGs.

Parameters:

vg_names - list of volume group names, if empty all will be returned
filter_readonly - whether to skip over readonly VGs

Returns: list

list of tuples (free_space, total_size, name) with free_space in MiB

_ValidateName(cls, name)
Class Method

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Validates that a given name is valid as VG or LV name.

The list of valid characters and restricted names is taken out of the lvm(8) manpage, with the simplification that we enforce both VG and LV restrictions on the names.

Remove(self)

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Remove this logical volume.

Overrides: BlockDev.Remove

Rename(self, new_id)

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Rename this logical volume.

Overrides: BlockDev.Rename

Attach(self)

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Attach to an existing LV.

This method will try to see if an existing and active LV exists which matches our name. If so, its major/minor will be recorded.

Overrides: BlockDev.Attach

Assemble(self)

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Assemble the device.

We always run `lvchange -ay` on the LV to ensure it's active before use, as there were cases when xenvg was not active after boot (also possibly after disk issues).

Overrides: BlockDev.Assemble

Shutdown(self)

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Shutdown the device.

This is a no-op for the LV device type, as we don't deactivate the volumes on shutdown.

Overrides: BlockDev.Shutdown

GetSyncStatus(self)

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Returns the sync status of the device.

If this device is a mirroring device, this function returns the status of the mirror.

For logical volumes, sync_percent and estimated_time are always None (no recovery in progress, as we don't handle the mirrored LV case). The is_degraded parameter is the inverse of the ldisk parameter.

For the ldisk parameter, we check if the logical volume has the 'virtual' type, which means it's not backed by existing storage anymore (read from it return I/O error). This happens after a physical disk failure and subsequent 'vgreduce --removemissing' on the volume group.

The status was already read in Attach, so we just return it.