Class adaptor:FcIfFC4Stats (CONCRETE)

Class ID:355
Encrypted: false - Exportable: false - Persistent: false
Privileges: [admin, operations, read-only]
SNMP OID: .1.3.6.1.4.1.9.9.719.1.3.41

FC4 statistics for FC port (see SNIA HBAAPI)


Naming Rules
RN FORMAT: fc-if-fc4-stats

    [1] PREFIX=fc-if-fc4-stats


DN FORMAT: 

[0] sys/chassis-[id]/blade-[slotId]/adaptor-[id]/host-fc-[id]/fc-if-fc4-stats

[1] sys/rack-unit-[id]/adaptor-[id]/host-fc-[id]/fc-if-fc4-stats

[2] sys/chassis-[id]/cartridge-[slotId]/server-[serverInstanceId]/adaptor-[id]/host-fc-[id]/fc-if-fc4-stats

[3] sys/chassis-[id]/cartridge-[slotId]/server-[serverInstanceId]/adaptor-[id]/host-fc-[id]/fc-if-fc4-stats

                



Containers Hierarchies
top:Root This class represents the root element in the object hierarchy. All managed objects in the system are descendants of the Root element.
 ├
top:System Provides general information about this system, such as the name, IP address and current time.
 
 ├
compute:RackUnit A physical compute RackUnit. Physical compute item representing a Rack mountable unit.
 
 
 ├
adaptor:Unit An managed object representing a network adaptor unit such as a card that has Nic and/or Hba, Scsi functionality.
 
 
 
 ├
adaptor:HostFcIf Representation of host-facing fibre channel interface on a server adaptor. A server adaptor has network facing interfaces (NIF), which provide network connectivity to the SAN fabric (through the IO Module for UCS blades) and server facing interfaces (SIF), which are visible by the Operating System.
 
 
 
 
 ├
adaptor:FcIfFC4Stats
top:Root This class represents the root element in the object hierarchy. All managed objects in the system are descendants of the Root element.
 ├
top:System Provides general information about this system, such as the name, IP address and current time.
 
 ├
equipment:Chassis A physical unit that can accomodate multiple blade servers. For example, the Cisco UCS 5108 Blade Server Chassis is six rack units (6RU) high, can mount in an industry-standard 19-inch rack and uses front-to-back cooling.
 
 
 ├
compute:Blade A physical compute blade. Physical compute item in blade form factor.
 
 
 
 ├
adaptor:Unit An managed object representing a network adaptor unit such as a card that has Nic and/or Hba, Scsi functionality.
 
 
 
 
 ├
adaptor:HostFcIf Representation of host-facing fibre channel interface on a server adaptor. A server adaptor has network facing interfaces (NIF), which provide network connectivity to the SAN fabric (through the IO Module for UCS blades) and server facing interfaces (SIF), which are visible by the Operating System.
 
 
 
 
 
 ├
adaptor:FcIfFC4Stats
top:Root This class represents the root element in the object hierarchy. All managed objects in the system are descendants of the Root element.
 ├
top:System Provides general information about this system, such as the name, IP address and current time.
 
 ├
equipment:Chassis A physical unit that can accomodate multiple blade servers. For example, the Cisco UCS 5108 Blade Server Chassis is six rack units (6RU) high, can mount in an industry-standard 19-inch rack and uses front-to-back cooling.
 
 
 ├
compute:Cartridge A physical compute cartridge.
 
 
 
 ├
compute:ServerUnit A server instance on a cartridge.
 
 
 
 
 ├
adaptor:Unit An managed object representing a network adaptor unit such as a card that has Nic and/or Hba, Scsi functionality.
 
 
 
 
 
 ├
adaptor:HostFcIf Representation of host-facing fibre channel interface on a server adaptor. A server adaptor has network facing interfaces (NIF), which provide network connectivity to the SAN fabric (through the IO Module for UCS blades) and server facing interfaces (SIF), which are visible by the Operating System.
 
 
 
 
 
 
 ├
adaptor:FcIfFC4Stats


Contained Hierarchy
adaptor:FcIfFC4Stats
 ├
adaptor:FcIfFC4StatsHist

Inheritance
stats:Item
 ├
stats:Curr
 
 ├
adaptor:FcIfFC4Stats

Events
                



Faults
                



Fsms
                



Stats Info

NOT SUPPORTED

Properties Summary
Defined in: adaptor:FcIfFC4Stats
adaptor:HostCounter64
          scalar:Uint64
controlRequests  (adaptor:FcIfFC4Stats:controlRequests)
           Number of control requests
adaptor:HostCounter64
          scalar:Uint64
controlRequestsDelta  (adaptor:FcIfFC4Stats:controlRequestsDelta)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
controlRequestsDeltaAvg  (adaptor:FcIfFC4Stats:controlRequestsDeltaAvg)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
controlRequestsDeltaMax  (adaptor:FcIfFC4Stats:controlRequestsDeltaMax)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
controlRequestsDeltaMin  (adaptor:FcIfFC4Stats:controlRequestsDeltaMin)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputMegabytes  (adaptor:FcIfFC4Stats:inputMegabytes)
           Number of Megabytes of data that has been input
adaptor:HostCounter64
          scalar:Uint64
inputMegabytesDelta  (adaptor:FcIfFC4Stats:inputMegabytesDelta)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputMegabytesDeltaAvg  (adaptor:FcIfFC4Stats:inputMegabytesDeltaAvg)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputMegabytesDeltaMax  (adaptor:FcIfFC4Stats:inputMegabytesDeltaMax)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputMegabytesDeltaMin  (adaptor:FcIfFC4Stats:inputMegabytesDeltaMin)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputRequests  (adaptor:FcIfFC4Stats:inputRequests)
           Number of input requests
adaptor:HostCounter64
          scalar:Uint64
inputRequestsDelta  (adaptor:FcIfFC4Stats:inputRequestsDelta)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputRequestsDeltaAvg  (adaptor:FcIfFC4Stats:inputRequestsDeltaAvg)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputRequestsDeltaMax  (adaptor:FcIfFC4Stats:inputRequestsDeltaMax)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
inputRequestsDeltaMin  (adaptor:FcIfFC4Stats:inputRequestsDeltaMin)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputMegabytes  (adaptor:FcIfFC4Stats:outputMegabytes)
           Number of Megabytes of data that has been output
adaptor:HostCounter64
          scalar:Uint64
outputMegabytesDelta  (adaptor:FcIfFC4Stats:outputMegabytesDelta)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputMegabytesDeltaAvg  (adaptor:FcIfFC4Stats:outputMegabytesDeltaAvg)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputMegabytesDeltaMax  (adaptor:FcIfFC4Stats:outputMegabytesDeltaMax)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputMegabytesDeltaMin  (adaptor:FcIfFC4Stats:outputMegabytesDeltaMin)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputRequests  (adaptor:FcIfFC4Stats:outputRequests)
           Number of output requests
adaptor:HostCounter64
          scalar:Uint64
outputRequestsDelta  (adaptor:FcIfFC4Stats:outputRequestsDelta)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputRequestsDeltaAvg  (adaptor:FcIfFC4Stats:outputRequestsDeltaAvg)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputRequestsDeltaMax  (adaptor:FcIfFC4Stats:outputRequestsDeltaMax)
           NO COMMENTS
adaptor:HostCounter64
          scalar:Uint64
outputRequestsDeltaMin  (adaptor:FcIfFC4Stats:outputRequestsDeltaMin)
           NO COMMENTS
scalar:Bitmask64 thresholded  (adaptor:FcIfFC4Stats:thresholded)
           Overrides:stats:Item:thresholded
           NO COMMENTS
Defined in: stats:Curr
scalar:Uint32 intervals  (stats:Curr:intervals)
           override name="type">
scalar:Uint32 update  (stats:Curr:update)
           Internal field where: bits 0-15 contain current number of updates within interval bits 16-31 contain current history ID
Defined in: stats:Item
scalar:Bool suspect  (stats:Item:suspect)
           NO COMMENTS
scalar:Date timeCollected  (stats:Item:timeCollected)
           property name="type" type="Type" owner="management" mod="implicit" /
Defined in: mo:TopProps
mo:ModificationChildAction
          scalar:Bitmask32
childAction  (mo:TopProps:childAction)
          
reference:Object dn  (mo:TopProps:dn)
           The Distinguished Name (dn) unambiguously identifies an object in the system.
The dn provides a fully qualified path from the top of the object tree, all the way to the object. It is built as a sequence of relative names separated by the "/" character.
For example:
< ... dn = "sys/chassis-5/blade-2/adaptor-1" />
reference:RN rn  (mo:TopProps:rn)
           The Relative Name (rn) uniquely identifies an object within a given context.
Note that a dn is comprised of a sequence of relative names. For example, the context "sys/chassis-1/blade-1/adaptor-1/host-eth-2" can be thought of as the following expression:
dn = <root object>/{rn}/{rn}/{rn}/{rn}/{rn}.
The rn can then be used to identify the object (for instance, "adaptor-1") within the context:
<... rn ="../" />
mo:InstSaclType
          scalar:Bitmask8
sacl  (mo:TopProps:sacl)
           The system acl property for each Managed Object. br/> This property is a 8 bit mask and supports the following values :-
a: del
b: mod
c: addchild
d: cascade

By default all Managed Objects have the following permissions
a: del
b: mod
c: addchild
This property is persisted in the db. If this property has a value none
it means, the user has read only permissions on this object.
mo:ModificationStatus
          scalar:Bitmask32
status  (mo:TopProps:status)
           This property controls the life cycle of a managed object

Properties Detail

childAction

Type: mo:ModificationChildAction
Primitive Type: scalar:Bitmask32
Units: null
Encrypted: false
Access: implicit
Category: TopLevelChildAction
Property Validators:
Comments:
Constants
deleteAll 16384u NO COMMENTS
ignore 4096u NO COMMENTS
deleteNonPresent 8192u NO COMMENTS
DEFAULT 0 This type is used to

controlRequests

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: CumulativeCounter
Property Validators:
Comments:
Number of control requests
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

controlRequestsDelta

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: ImplicitPeriodic
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

controlRequestsDeltaAvg

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitAvg
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

controlRequestsDeltaMax

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMax
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

controlRequestsDeltaMin

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMin
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

dn

Type: reference:Object
Units: null
Encrypted: false
Access: implicit
Category: TopLevelDn
Property Validators:
Comments:
The Distinguished Name (dn) unambiguously identifies an object in the system.
The dn provides a fully qualified path from the top of the object tree, all the way to the object. It is built as a sequence of relative names separated by the "/" character.
For example:
< ... dn = "sys/chassis-5/blade-2/adaptor-1" />

inputMegabytes

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: CumulativeCounter
Property Validators:
Comments:
Number of Megabytes of data that has been input
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputMegabytesDelta

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: ImplicitPeriodic
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputMegabytesDeltaAvg

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitAvg
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputMegabytesDeltaMax

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMax
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputMegabytesDeltaMin

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMin
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputRequests

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: CumulativeCounter
Property Validators:
Comments:
Number of input requests
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputRequestsDelta

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: ImplicitPeriodic
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputRequestsDeltaAvg

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitAvg
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputRequestsDeltaMax

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMax
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

inputRequestsDeltaMin

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMin
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

intervals

Type: scalar:Uint32
Units: null
Encrypted: false
Access: implicit
Category: TopLevelRegular
Property Validators:
Comments:
override name="type">

outputMegabytes

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: CumulativeCounter
Property Validators:
Comments:
Number of Megabytes of data that has been output
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputMegabytesDelta

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: ImplicitPeriodic
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputMegabytesDeltaAvg

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitAvg
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputMegabytesDeltaMax

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMax
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputMegabytesDeltaMin

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMin
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputRequests

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: CumulativeCounter
Property Validators:
Comments:
Number of output requests
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputRequestsDelta

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: implicit
Category: ImplicitPeriodic
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputRequestsDeltaAvg

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitAvg
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputRequestsDeltaMax

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMax
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

outputRequestsDeltaMin

Type: adaptor:HostCounter64
Primitive Type: scalar:Uint64
Units: null
Encrypted: false
Access: oper
Category: ImplicitMin
Property Validators:
Comments:
NO COMMENTS
Constants
NA 0xffffffffffffffffull NO COMMENTS
DEFAULT 0 NO COMMENTS

rn

Type: reference:RN
Units: null
Encrypted: false
Access: implicit
Category: TopLevelRn
Property Validators:
Comments:
The Relative Name (rn) uniquely identifies an object within a given context.
Note that a dn is comprised of a sequence of relative names. For example, the context "sys/chassis-1/blade-1/adaptor-1/host-eth-2" can be thought of as the following expression:
dn = <root object>/{rn}/{rn}/{rn}/{rn}/{rn}.
The rn can then be used to identify the object (for instance, "adaptor-1") within the context:
<... rn ="../" />

sacl

Type: mo:InstSaclType
Primitive Type: scalar:Bitmask8
Units: null
Encrypted: false
Access: implicit
Category: TopLevelSacl
Property Validators:
Comments:
The system acl property for each Managed Object. br/> This property is a 8 bit mask and supports the following values :-
a: del
b: mod
c: addchild
d: cascade

By default all Managed Objects have the following permissions
a: del
b: mod
c: addchild
This property is persisted in the db. If this property has a value none
it means, the user has read only permissions on this object.
Constants
none 0 NO COMMENTS
del 1 NO COMMENTS
mod 2 NO COMMENTS
addchild 4 NO COMMENTS
cascade 8 NO COMMENTS
DEFAULT 0 NO COMMENTS

status

Type: mo:ModificationStatus
Primitive Type: scalar:Bitmask32
Units: null
Encrypted: false
Access: implicit
Category: TopLevelStatus
Property Validators:
Comments:
This property controls the life cycle of a managed object
Constants
removed 16u In a setter method: specifies that an object should be removed.
In the return value of a setter method: indicates that an object has been removed.
created 2u In a setter method: specifies that an object should be created. An error is returned if the object already exists.
In the return value of a setter method: indicates that an object has been created.
modified 4u In a setter method: specifies that an object should be modified
In the return value of a setter method: indicates that an object has been modified.
deleted 8u In a setter method: specifies that an object should be deleted.
In the return value of a setter method: indicates that an object has been deleted.
DEFAULT 0 This type controls the life cycle of objects passed in the XML API.

When used in a setter method (such as configConfMo), the ModificationStatus specifies whether an object should be created, modified, deleted or removed.
In the return value of a setter method, the ModificationStatus indicates the actual operation that was performed. For example, the ModificationStatus is set to "created" if the object was created. The ModificationStatus is not set if the object was neither created, modified, deleted or removed.

When invoking a setter method, the ModificationStatus is optional:
If a setter method such as configConfMo is invoked and the ModificationStatus is not set, the system automatically determines if the object should be created or modified.


suspect

Type: scalar:Bool
Units: null
Encrypted: false
Access: implicit
Category: TopLevelRegular
Property Validators:
Comments:
NO COMMENTS
Constants
yes true NO COMMENTS
no false NO COMMENTS

thresholded

Type: scalar:Bitmask64
Overrides:stats:Item:thresholded
Units: null
Encrypted: false
Access: implicit
Category: TopLevelRegular
Property Validators:
Comments:
NO COMMENTS
Constants
inputRequestsDeltaMax 1024ull NO COMMENTS
inputMegabytesDeltaMin 128ull NO COMMENTS
outputRequestsDeltaAvg 131072ull NO COMMENTS
outputMegabytesDeltaMax 16384ull NO COMMENTS
inputMegabytesDelta 16ull NO COMMENTS
controlRequestsDelta 1ull NO COMMENTS
inputRequestsDeltaMin 2048ull NO COMMENTS
inputRequestsDelta 256ull NO COMMENTS
outputRequestsDeltaMax 262144ull NO COMMENTS
controlRequestsDeltaAvg 2ull NO COMMENTS
outputMegabytesDeltaMin 32768ull NO COMMENTS
inputMegabytesDeltaAvg 32ull NO COMMENTS
outputMegabytesDelta 4096ull NO COMMENTS
controlRequestsDeltaMax 4ull NO COMMENTS
inputRequestsDeltaAvg 512ull NO COMMENTS
outputRequestsDeltaMin 524288ull NO COMMENTS
inputMegabytesDeltaMax 64ull NO COMMENTS
outputRequestsDelta 65536ull NO COMMENTS
outputMegabytesDeltaAvg 8192ull NO COMMENTS
controlRequestsDeltaMin 8ull NO COMMENTS
DEFAULT 0 NO COMMENTS

timeCollected

Type: scalar:Date
Units: null
Encrypted: false
Access: implicit
Category: TopLevelRegular
Property Validators:
Comments:
property name="type" type="Type" owner="management" mod="implicit" /

update

Type: scalar:Uint32
Units: null
Encrypted: false
Access: implicit
Category: TopLevelRegular
Property Validators:
Comments:
Internal field where: bits 0-15 contain current number of updates within interval bits 16-31 contain current history ID