Glossary (A - Z)

The Advanced Copy function enables data backup (data replication) at any point without stopping the operations of the storage system.

For the backup operation of the storage system, data can be replicated without taking server resources. The replication process for large amounts of data and business access can be performed by controlling the timing so that data protection is considered to be separate from operation processes.

There are two types of Advanced Copy: a local copy that is performed within a single storage system and a remote copy that is performed between multiple storage systems. The methods that are available for the local copy function are "OPC", "QuickOPC", "SnapOPC", "SnapOPC+", and "EC". "REC" is available for the remote copy function.

AIS Connect is a remote maintenance service function that is provided by Fujitsu Technology Solutions GmbH (FTS).

AIS Connect will be EOLed on December 2022.

Chunk size is a physical capacity that is assigned to virtual logical volumes created in TPPs and FTRPs when a write occurs from the host. There are five chunk sizes, 21 MB, 42 MB, 84 MB, 168 MB, and 336 MB. The chunk size is automatically set as 21 MB or 336 MB depending on the "Maximum Pool Capacity" of the storage system when a new TPP is created. If "Maximum Pool Capacity" is "128 PB" and "Advanced Setting" is used when a new TPP is created, the chunk size can be set as 21 MB, 42 MB, 84 MB, 168 MB, or 336 MB. If the "Maximum Pool Capacity" is expanded with the [Set Thin Provisioning] function, the chunk size for the new TPP may differ from the existing TPPs. For example, if the maximum pool size of the ETERNUS DX8900 S4 is expanded from "8 PB" to "128 PB", the chunk size is changed from "21 MB" to "336 MB". The changed chunk size is applied when TPPs are created after the change. As a result, TPPs with different chunk sizes exist in the storage system. The chunk size for the created TPP cannot be changed. The chunk size for a new FTRP is set in the same way as when a TPP is created. The chunk size for each pool is displayed in the TPP list and the FTRP list.

The chunk size of the TPPs for Compression is usually "21 MB". Use "Advanced Setting" to create a TPP with other chunk sizes.

(Example) For the ETERNUS DX8900 S4:

The Eco-mode is a function that reduces power consumption by stopping the rotation of disks that have limited access time for specified periods of time.

Disk spin-up and spin-down schedules can be set for each RAID group or Thin Provisioning Pool (TPP).

The mode for encrypting volumes by using the CM.

"Encryption Mode is enabled" indicates that "Fujitsu Original Encryption", "AES-128", or "AES-256" has been selected for "Encryption Mode". Refer to the [Setup Encryption Mode] function for details.

A type of Advanced Copy. The EC function creates a copy that is always in sync with any updates in the business volume (Mirror Suspend).

This function can back up the copy volume to a tape device while operations with the business volume continue by suspending synchronization (mirroring) between the business volume and the copy volume at a specific point in time. In addition to the Mirror Suspend function, the storage system also provides the Suspend Resume function, which copies only updated data after an initial copy is performed.

Volumes in the external storage system that transfer the External LU Information to the local storage system. This volume is called "External Drive" because it is equivalent to a drive in the local storage system.

External Drives are displayed in the [External Drives] screen. Only the [Delete] action is available for the created External Drives.

Volumes in the external storage system (External Drives) that transfer the External LU Information and are managed as RAID groups in the local storage system.

External RAID Groups are displayed in the [External RAID Group] screen. One "External RAID Group" consists of one "External Drive". The [Delete] and [Recover] actions are available for the created External RAID Groups.

The storage system that connects to the local storage system as a target and provides External Drives.

For the Non-disruptive Storage Migration function, the external storage system corresponds to the migration source storage system.

Volumes in the external storage system that transfer the External LU Information (External Drives) and are managed as volumes in the local storage system.

External Volumes are displayed in the [Volume] screen. The volume type is "Standard". External Volumes are created in the following order: "External Drive" → "External RAID Group" → "External Volume". One "External RAID Group" consists of one "External Drive". Furthermore, one "External Volume" consists of one "External RAID Group".

For the Non-disruptive Storage Migration function, the External Volume corresponds to the migration source volume. In the [Volume] screen, the External Volumes are displayed as volumes whose "Usage" is "Migration". The [Delete], [Rename], and [Start RAID Migration] actions are available for External Volumes before the data migration. The following operations are not available before the data migration is complete:

• Format, expansion, and encryption of External Volumes
• Storage Migration that uses External Volumes as migration destinations (online Storage Migration/offline Storage Migration)
• Advanced Copy that uses External Volumes as copy sources or copy destinations

After the data migration is completed, External Volumes can be handled equivalently to normal volumes (internal volumes). However, volumes that inherit the "External LU Information" cannot be used for the Storage Cluster function.

The host affinity setting is used to associate host groups and port groups with LUN groups. It also used to associate hosts and ports with LUN groups.

By setting host affinity between host groups (or hosts), port groups (or ports), and LUN groups, the volumes in the LUN groups can be accessed from the host via the ports.

An interface type that connects the server and the storage system.

iSCSI is a protocol standard that includes SCSI commands and data within the transmission frame of TCP/IP packets to send or receive commands and data via the IP network. IPv4 and IPv6 are supported.

The key group combines all of the RAID groups that use the same SED authentication key.

The storage system that connects to the external storage system as an initiator and performs integrated management of External Drives.

For the Non-disruptive Storage Migration function, the local storage system corresponds to the migration destination storage system.

LDE is a function to dynamically expand the RAID group capacity by adding drives to an existing RAID group.

To perform LDE, select the target RAID group and click [Expand] in [Action].

LUN Concatenation is a function that expands the existing volume capacity by concatenating free areas in a RAID group.

To perform LUN Concatenation, select the target volume and click [Expand Volume] in [Action].

MIB describes the specifications and formats for groups of objects and variable numbers that can be read or written via an SNMP protocol.

In the MIB for this storage system, information for system monitoring (component information such as drives and other setup parameters) are described.

When a storage system has multiple CMs, the CM that is given the authority to manage the storage system is called the "Master CM" and the other CMs are called "Slave CMs".

When an error occurs in a CM or a LAN, the Master CM is automatically switched, and the IP address of the old Master CM is passed to the new Master CM. If connection to the Master CM is unavailable due to an error, the Master CM can be forcibly switched to a Slave CM by specifying which Slave CM IP address to connect to.

• Initialize Meta Cache Distribution

• Automatic Meta Cache Distribution

A Monitor session is a copy session that measures the amount of updates in the copy source area. This session does not perform the copy process and has no copy destination area. A Monitor session can be used to estimate the SDP capacity or to estimate the REC bandwidth (*1).

A type of Advanced Copy. An OPC is a function that creates a copy of the entire business volume at any point (Background Copy).

This function performs a logical data copy from a business volume to a duplicate volume in a short period of time without waiting for the completion of a physical copy. Duplicate volumes can be backed up to a tape device while operations with the business volume continue.

The optimizing capacity (Zero Reclamation) function that releases the physical area when data in the block (*1) that is allocated to a TPV or an FTV is filled with zeros.

PFMs are installed in CEs (slot #16 to slot #23) of the ETERNUS DX500 S5/DX600 S5/DX900 S5 or the ETERNUS DX8900 S4. If the Extreme Cache capacity is set after adding PFMs in hot mode, the PFMs can be used as Extreme Cache.

A type of Advanced Copy. A QuickOPC creates a copy of the entire business volume when an initial copy is performed. After this initial copying operation is complete, this function copies only updated (differential) data to a duplicated volume (Background Copy).

A QuickOPC is suitable for large databases that require a reduction in the backup time.

REMCS is an original remote maintenance system that is made by Fujitsu.

By automatically notifying failures to the remote center, immediate troubleshooting is available.

An SED is hard disk drive that has an encryption chip called the Advanced Encryption Standard (AES) engine and an encryption key within the drive. SEDs perform encryption by themselves and do not require any encryption processes to be performed by the storage system firmware. This enables data to be encrypted without reducing the performance of the storage system.

Authentication keys are required to access SEDs. There are two types of SED authentication keys: an authentication key (a common key) that is created in the storage system and an authentication key that is created in the key server.

"SED" indicates "Online SED", "Nearline SED", and "SSD SED".

A type of Advanced Copy. This function only copies the data prior when data is updated (Copy-on-Write).

This copy method requires a smaller capacity than Full Backup processes and is suitable for system backups of file servers that are updated in small amounts.

An SSD is a high performance/high reliability drive that supports 24 hour operation every day. This disk drive is used for storing frequently accessed data that requires high performance (such as databases).

SSDs use flash memory as their storage media and provide better random access performance than Online and Nearline hard disks. Containing no motors or other moving parts, they are highly resistant to impact and have low power consumption requirements.

"SSD-H" (High), "SSD-M" (Middle), and "SSD-L" (Less) are SSDs with 12 Gbit/s of interface speed (bandwidth). For SSDs, drive features such as performance vary depending on the capacity for the reserved space, also called Over Provisioning. SSD types (H/M/L) are determined by the Over Provisioning capacity.

When a RAID group, a TPP, or an FTSP is configured with SSDs, "SSD" is displayed as the drive type regardless of the actual SSD type (SSD-H/SSD-M/SSD-L). Unless otherwise specified, this manual refers to "SSD-H", "SSD-M", and "SSD-L" collectively as "SSD".

SSD-H, SSD-M, or SSD-L that has the encryption function built-in (or SED).

When a RAID group, a TPP, or an FTSP is configured with a single SSD type (SSD-H SED/SSD-M SED/SSD-L SED), or configured with multiple SSD types (SSD-H SED/SSD-M SED/SSD-L SED), "SSD SED" is displayed as the drive type. Unless otherwise specified, this manual refers to "SSD-H SED", "SSD-M SED", and "SSD-L SED" collectively as "SSD SED".

Standard volumes are the most commonly used volumes that are created in RAID groups or External RAID Groups.

A standard volume is used for normal usage, such as file systems and databases. The server recognizes it as a single logical unit.

A snapshot volume that is created by the Veeam Universal Storage Integration API in the Veeam Storage Integration environment.

This volume is a copy destination volume or a restoration source volume for the Veeam sessions (SnapOPC+). In the [Volume] screen, the following are displayed for "Name", "Usage", and "Usage Details".

• The default name is "Copy source volume name_snap_YYMMDDHHMM". (YYMMDDHHMM: the date and time when the volume is created.)

  1. If the volume name exceeds 32 characters, the excess characters are deleted from the "copy source volume name", and replaced with a "~". Then, the name will contain only 32 characters.

  2. If the name that is shortened in Step 1 already exists, a suffix number "_X" (X: serial numbers starting with "0") will be added.

• "Usage" is "Veeam", "Dedupe&Comp/Veeam", "Dedupe/Veeam", or "Comp/Veeam".

• "Usage Detail" is "Veeam", "Dedupe&Comp/Veeam", "Dedupe/Veeam", or "Comp/Veeam".

  Refer to the [Volume (Basic Information)] function for details.