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Stands for Allocation Unit Size. All Windows file systems organize your hard disk based on cluster or Allocation Unit Size. The Allocation Unit Size represents the smallest amount of disk space that can be allocated to hold a file. If a file size is not an even multiple of the cluster size, extra space must be used to hold the file (up to the next multiple of the cluster size). This would result in lost space and fragmentation of the hard disk.

In StorSimple context, AUS needs to be specified while formatting a StorSimple Volume. The recommended AUS value for StorSimple volume is 64KB.



Stands for Active Directory and is a directory service created by Microsoft for Windows server operating systems. The Server computers on which Active Directory is running are called Domain Controllers. AD is responsible for authenticating and authorizing all the users within a windows domain network. For instance, when a user logs into a computer that is part of a windows domain, the AD will verify his/her password and accordingly assign user privileges. The AD uses a LDAP protocol.

In StorSimple context, the Active Directory settings are specified by accessing the Active Directory or LDAP Settings section in Configure > Security Settings > Web User Accounts.





Backup Registry

In the StorSimple context, the backup registry refers to the list of all the Cloud Snapshots and Cloud Clones stored in the configured cloud storage for all service providers.



Often used as a synonym for 'data transfer rate' in network systems, it refers to the amount of data that can be carried from one point to another in a given time period (usually a second). This kind of bandwidth is usually expressed in bits (of data) per second (bps) or in bytes per second (Bps).


Bandwidth Rate (Mbps)

Refers to the bandwidth in 'Megabits per second' and is used by the appliance in operations involving the cloud.

In StorSimple context, this value is specified under Configure > Templates > QoS Templates. The recommended value for this field is a number between 1-1000. Note that the bandwidth rate of '0' implies that no bandwidth controls have been employed.



Stands for Binary Large Objects.  A BLOB is a collection of binary data stored as a single entity in a database management system. Blobs are typically images, audio or other multimedia objects, though sometimes binary executable code is stored as a blob. 





Stands for Challenge Handshake Authentication Protocol. It is used to authenticate the peer of a connection, based on the peer sharing a password or secret. CHAP can be one-way or mutual. One-way CHAP is when the target will authenticate an initiator. By the same token, the mutual CHAP requires that the target authenticate the initiator and vice-versa.

In StorSimple context, CHAP Target Settings under Configure > Security Settings will allow you to configure the credentials used by StorSimple for mutual CHAP. The user can supply a CHAP user and secret on this page.

The CHAP Initiators page under Configure > Security Settings will allow you to define the credentials that your servers will use when connecting to this StorSimple appliance for one-way or mutual CHAP.



Refers to networked resources that are used for computing, storage or applications.


Cloud Clones

Like Cloud Snapshots, but Cloud Clones are written to a separate bucket from the bucket used to store the primary volume data. Cloud Clones ensure a truly independent copy of data is created, and are useful when taking a backup copy of a volume or volumes that are used as primary storage where an off-site backup equivalent is required.

Cloud Clones can be specified by creating new policies under Configure > Policies and defining rules for automated backups.


Cloud Snapshots

Like snapshots, but Cloud Snapshots are immediately written to the cloud account associated with the volumes contained within the volume group. Cloud Snapshots are written to the same repository as the volumes themselves in the cloud, and are useful when taking a backup copy of a volume or volumes that are used as secondary storage where an independent copy is not required.



Saving data in a temporary storage so that future requests of the data can be served faster.





Data-at-rest Encryption

Data-at-rest refers to the data that resides in computer storage while excluding data that is traversing a network or temporarily residing in computer memory to be read or updated. The process of securing this data against theft by encrypting it is referred to as Data-at-rest Encryption.

In StorSimple context, the Data-at-Rest Encryption is enabled by default in the Security tab under Configure > Cloud Accounts > Create Cloud Account page.


Data-at-rest Encryption key

This password/key is used to access the data that has been secured by Data-at-rest encryption.

In StorSimple context, this field is available when the user is creating a Cloud Credential by accessing Configure > Cloud > Cloud Credential.


Data Deduplication 

Refers to the process of eliminating duplicate data and preserving only single-instance of data.


Deduplication Ratio

Is the ratio of data prior to deduplication to that of after deduplication.


DNS Server

The Domain Name System (DNS) is a standard technology for managing the names of Web sites and other Internet domains. A key element of the DNS is a worldwide collection of DNS servers. A DNS server is any computer registered to join the Domain Name System, has a public IP address and contains a database of network names and addresses for other Internet hosts.

In StorSimple context, the DNS server is specified under Configure > General Settings > DNS Settings. This setting allows your StorSimple appliance to resolve hostnames of cloud storage service providers to IP addresses.





Stands for External Binary Store. An EBS provider in SharePoint will allow you to store BLOB data in a data store that is external to the SharePoint content database.



Stands for External Bunch Of Disks. In StorSimple context, this refers to the EBOD Enclosure. 










Initiator Name 

Stands for IQN. see IQN



Stands for iSCSI Qualified Name. It is one of the three name formats used for specifying iSCSI initiators and targets. An IQN is composed of type, date, naming authority, and a string defined by naming authority.

In StorSimple context, for instance, an can be broken down as

  • Type - iqn,
  • Date - 1991-05,
  • Naming authority -, and
  • String - win-u5hd9gv5h67

In StorSimple Web UI, this field is specified under Configure > Security Settings > Access Control Records.


iSCSI initiator

An iSCSI Software Initiator enables you to connect a Windows® host computer to an external iSCSI-based storage array via an Ethernet network adapter. This can be achieved by using Microsoft iSCSI Initiator in your existing network infrastructure.

In StorSimple context, an iSCSI Initiator can be your StorSimple appliance connecting to DPC software residing on a Windows® host computer.


iSCSI target

Targets manage the connections between the iSCSI storage subsystems in your storage area network (SAN) and the servers (initiators) that need to access them.









Stands for Local Area Network. LAN refers to a computer network that connects computers and devices locates in close proximity such as home, school, computer laboratory or office building. A LAN is typically characterized by higher data-transfer rates, smaller geographic area, and lack of a need for leased telecommunication lines. A LAN can connect to other LANs, to the Internet or other WAN (Wide Area Network). See also WAN.


Licensed Capacity

Refers to the storage capacity available for your StorSimple appliance based on the licenses purchased.



Stands for Light-Weight Directory Access Protocol. LDAP is an application protocol for reading and editing directories over an IP network.

In StorSimple context, the LDAP settings are available under Configure > Security Settings > Web User Accounts.



Stands for Logical Unit Number. LUN is used to identify a logical unit which is a device addressed by the iSCSI protocol. In StorSimple context, a LUN refers to a logical disk created on a Storage Area Network.





Stands for MultiPath I/O. The Microsoft® Multipath I/O (MPIO) framework helps ensure that your data is available at all times. MPIO supports multiple data paths to storage, improves the fault tolerance of the storage connection, and in some cases, provides greater aggregate throughput by using multiple paths at the same time. This helps improve system and application performance. This feature is available for Windows Server 2008 R2.




NTP Server

Stands for Network Time Protocol server. NTP is a protocol used for synchronizing the clocks of computer systems over data networks.

In StorSimple context, the NTP server can be specified under Configure > System Settings > Time Settings and is used by your appliance to synchronize time as cloud storage service providers require that time be reasonably synchronized.



Stands for NT LAN Manager in a Windows network environment. NTLM is a suite of Microsoft security protocols that provides authentication, integrity, and confidentiality to users by employing a three - way messaging system (sometimes four if additional integrity is required) to authenticate a user.

In StorSimple context, this authentication for a Web Proxy server can be specified under Configure > Security Settings > Web Proxy Settings.







Stands for Power Cooling Module. There are two Power Cooling Modules each in the StorSimple Appliance and the Expansion Array. The PCM comprises of two main parts - the power supplies and the cooling fan and hence the name Power Cooling Module. The Appliance has a 764W PCM whereas the Expansion Array in your StorSimple system has a 580W PCM.



Refer to job schedules, including those of Snapshots, Cloud Snapshots or Cloud Clones. The StorSimple Web UI allows the user to define either interactive or scheduled policies.





Stands for Quality Of Service. QoS is the set of techniques to manage network resources, for instance by managing the delay, bandwidth, and packet loss parameters on a network.

In StorSimple context, the QoS profiles allow the user to specify the times-of-day and days-of-week profiles and employ WAN bandwidth control. You can create QoS profiles by accessing Configure > Templates > QoS Templates.





Stands for Remote Blob Store. RBS (Remote Blob Store) is a set of standardized APIs introduced in SharePoint 2010. It allows storage/retrieval of BLOBs (binary large object data) outside of your main SQL database where a dedicated BLOB store is desirable.




SharePoint Farm

In the context of SharePoint, the term 'farm' is used to describe a collection of one or more SharePoint servers and one or more SQL servers that come together to provide a set of basic SharePoint services bound together by a single Configuration Database in SQL.



Like volumes, snapshots are automatically tiered by the StorSimple appliance across the integrated storage (including SSD and SAS) and cloud storage based on usage patterns. Snapshots are taken using Microsoft Volume Shadow Copy Services (VSS) to ensure a crash-consistent and application-consistent backup copy.



Stands for Simple Management Network Protocol. It is an Internet-standard protocol for managing devices on IP networks. It is used mostly to monitor network-attached devices for conditions that warrant administrative attention.

In StorSimple context, this user-configurable setting is available under SNMP Settings available under Configure > Notification Settings.



Stands for StorSimple Data Optimizer. StorSimple Data Optimizer is StorSimple’s revolutionary storage software solution that enables SharePoint Geo-Collaboration using Microsoft SharePoint Application.

The software takes advantage of frameworks supplied by Microsoft – specifically External Binary Storage (EBS) or Remote BLOB Storage (RBS) – and does not require the installation of server agents or custom services within the SharePoint farm. Operation is transparent to end users, and the StorSimple SharePoint Database Optimizer is fully managed from within SharePoint’s Central Administration portal. SSDO increases performance, minimizes storage costs, reduces database size and enables Disaster Recovery (DR), High Availability (HA) and Geo-Collaboration of SharePoint content.



Stands for StorSimple Data Protection Console. StorSimple Data Protection Console software installs as an MMC snap-in and allows the administrators to manage Snapshots, Cloud Snapshots and Cloud Clones. This software is fully supported by applications such as Exchange and SharePoint and minimizes administrative burden.



Stands for StorSimple Data Recovery Console.



Stands for Secure Socket Layer. SSL, like TLS, is a cryptographic protocol that provides communication security over the Internet.

In StorSimple context, this is a user-configurable setting for the ‘Email Settings’ section in the ‘Notification Settings’ page.



A subnet or subnetwork is an identifiably separate part of an organization's network. Typically, a subnet may represent all the machines at one geographic location, in one building, or on the same local area network (LAN). See also LAN.


Subnet Mask

A large LAN is often divided into logical groups called Subnets. This results in the division of an IP address into two fields, a network or routing prefix and the rest field. All computers belonging to a specific subnet will have their routing prefix specified in form of subnet mask.

 Like IP addresses, a subnet mask contains four bytes (32 bits) and is often written using the same "dotted-decimal" notation.

In StorSimple context, this value is set by accessing Configure > System Settings > General Settings and then specifying the 'Mask' under 'Network Interfaces' section.





Stands for Transport Layer Security. TLS, like SSL, is a cryptographic protocol that provides communication security over the Internet. See also SSL.

In StorSimple context, this is a user-configurable setting for the ‘Email Settings’ section in the ‘Notification Settings’ page.



Stands for Thin Provisioning. TP refers to a method of optimizing the efficiency with which the available storage space is utilized in Storage systems. In TP, the storage is allocated amongst multiple users based on the minimum space required by each user at any given time. See also FP.



Stands for Fat Provisioning. In conventional storage provisioning, storage space is allocated based on anticipated needs (and is usually beyond the current need). See also TP.







Stands for Access Control Record. An Access Control Record includes parameters to define one or more servers, and a volume can have one or more Access Control Records assigned to it. An Access Control Record is composed of CHAP credentials (optional) and IQNs. Each entry under Access Control Records defines a server that will access volumes you create on your StorSimple appliance. All parameters of the Access Control Record definition must match what is supplied by the initiator attempting to connect to a volume in order for access to be permitted.

In StorSimple context, the ACRs can be defined by accessing Configure > Security Settings > Access Control Records.



Presented in form of drives corresponding to the volumes mounted by the host, including those discovered through use of iSCSI and a StorSimple appliance.

In StorSimple context, the Volumes can be defined by accessing Configure > Volumes and specifying the volume-related settings.



The Volume Shadow Copy Service from Microsoft is a set of COM interfaces that implements a framework to allow volume backups to be performed while applications on a system continue to write to the volumes.


Virtual Appliance 

A virtual appliance is a tightly isolated software container that can run its own operating systems and applications as if it were a physical computer. A virtual appliance behaves exactly like a physical computer and contains it own virtual (software-based) CPU, RAM hard disk, and network interface card (NIC).





Stands for Wide Area Network. In contrast to LAN, WAN is a geographically dispersed telecommunications network. WAN will typically include public (shared user) networks though it can also be privately owned or rented. See also LAN.


Web Proxy

Acts as an intermediary for data access requests. Web Proxy server is typically used to add another layer of security, filter content, allow caching to ease bandwidth requirements or even help with analytics.

In StorSimple context, the web proxy settings on the appliance are configured by accessing Configure Security Settings Web Proxy settings and opening this page.



Stands for Web Front End. Often referred to as 'WFE' or 'Web Server', this is Windows SharePoint Services Web Application. This service is responsible for serving the HTML to clients and routing requests to other services in the SharePoint farm.












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