# Functions
GetMetaData get host regionid, zoneid.
NewDriver create the identity/node/controller server and disk driver.
NewNodeServer create a NodeServer object.
# Constants
CloudDisk cloud disk.
DefaultFs default fs.
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DefaultNA default NodeAffinity.
FsTypeTag is the fs type tag.
InstanceID is the instance id tag.
LinearType linear type.
LocalDisk local disk.
LvmTypeTag is the lvm type tag.
MetadataURL is metadata server url.
NodeAffinity is the pv node schedule tag.
NsenterCmd is the nsenter command.
PvTypeTag is the pv type tag.
RegionIDTag is the region id tag.
StripingType striping type.
TopologyNodeKey tag.
VgNameTag is the vg name tag.
# Variables
DeviceChars is chars of a device.
ErrParse is an error that is returned when parse operation fails.