| PRIMECLUSTER Global File Services Configuration and Administration Guide 4.1 (Linux) |
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This interface can handle files that exceed 2 gigabytes.
For details, see largefile(5) in the "Solaris X Reference Manual Collection" or the online manual.
Access client. Module which operates in the kernel layer (file system layer) on each node sharing GFS Shared File System. An AC communicates with the MDS if a user application operating on the node sends an access request in a system call. File operations are performed using meta-data sent from the MDS and direct access to the real.
The term ACCL refers to an AC.
The file system that made on the shared disk device is exclusive used in active node and the standing node in RMS Cluster.
Area management data includes information on i-nodes, V-data, and file data allocation information. It is stored in the meta-data area.
A disk file unit that is capable of handling an array of physical disks as a single virtual disk. By distributing access to multiple physical disks, it realizes performance improvement and high reliability. Ordinarily, several access systems are provided, which are referred to as RAID (Redundant Array of Independent Disks) systems. Principal RAID levels are RAID0 (disk striping), RAID1 (disk mirroring), RAID5 (disk striping with parity), and RAID0+1 (both disk striping and disk mirroring).
If a block failure on a disk device destroys partition structure information, a copy is available for continued processing of the file system.
The term data refers to file data.
The term data area refers to a file data area.
Direct I/O refers to a mode of data input/output that does not use kernel buffering.
An extent is a group of contiguous data blocks of the file system that are handled as a single unit. Each extent is defined by its start block and length.
The extent base is a method of managing file system data based on extents.
One of the interfaces using optical fibre cables as transmission media. In a cluster system, a fibre channel is used to connect a array disk and the computer.
File data is the data part of a file.
The area storing file data. It is also referred to as the data area.
File lock is a means for synchronization among processes that concurrently access data in the same file. There are two types of file locks: mandatory locks and advisory locks.
GDS(Global Disk Services).
Volume management software for protecting data by managing a disk storage device totally within a SAN environment. For details, refer to "PRIMECLUSTER Global Disk Services Configuration and Administration Guide" .
Software which allows various operations including GFS Shared File System configuration setting and operation management using the Web screen.
GLS(Global Link Services) software provides High Reliability of network communications by duplexing network communication paths using redundant NIC(Network Interface Card)s. For details, refer to "PRIMECLUSTER Global Link Services Configuration and Administration Guide."
The i-node contains information on the file locations on the disk, on file sizes, and on the time when the respective files were last. It also includes other information for identification.
The i-node area contains an i-node. It is located in the meta-data area.
Required information is managed when employing the GFS Shared File System. Moreover, this is used in order for sfcfrmd to maintain informational adjustment. The following information is included in the management partition.
1.Information on each node that constitutes the GFS Shared File System.
2.Correspondence information on common node of each GFS Shared File System, and shared device.
3.MDS arrangement information on each GFS Shared File System.
Meta-data server. Program that centrally manages the control information of a file system (meta-data). This program operates on the primary server and secondary server. Each AC communicates with the MDS and performs file operations according to the meta-data sent from the MDS.
The node with the possibility that MDS performs. MDS performs in either node that it is defined as MDS node in nodes that share the file system. The default MDS node is 2 for the primary and secondary MDS.
Same as the meta-data area
A generic term for management data on a file system. The meta-data includes free space information, i-nodes, indirect extent blocks, directry information, and symbolic link information.
The meta-data area contains meta-data. It is allocated in the representative partition.
A node is a computer system that runs under one operating system.
The node identifier is a universal name that is assigned to each node in the PRIMECLUSTER system. For each node, the node identifier is normally the same as the node name. However, if the node name was assigned to the standby node such as in hot standby mode, the correspondence between physical name and node name is temporarily disrupted. In this event, the node can be managed via the node identifier, which is the name for the physical device. The node identifier is displayed as each node name using PRIMECLUSTER Management View.
The node name is the name of a node that is displayed with the "uname -n" command and identified in the communication network. For details see uname(1) in the online manual.
The partition is a physical or logical disk slice.
This information refers to the partitions that constitute the GFS Shared File System. It includes information about the size of the meta-data area, update log area, file data area (data area) and on their layout in the configuration partition.
Node on which the management server daemon of the Web-Based Admin View operates during normal operation. The primary management server uses the menus of the GFS management view to accept operation and display requests from the client and to transfer the requests to the monitored nodes.
Node on which the MDS operates during normal operation in a cluster system. This server should be set during file system registration.
The partition configuring a file system. It can be specified when a file system is created. Operations for a file system can be conducted by specifying its representative partition.
A range of node set that can share an object when a disk class is shared.
Node on which the Web-Based Admin View management server daemon operates if an error occurs on the primary management server. A secondary management server is set when the Web-Based Admin View operating environment is set. If an error occurs on the primary management server, the management server function of the Web-Based Admin View passes to the secondary management server.
Server that takes over the MDS function if an error occurs on the primary server in a cluster system. The secondary server must be set during file system registration before it can assume the MDS function when an error occurs on the primary server. The file system status is restored to assure contiguous access from each AC.
The demand from the commands or sfcfsd is received and the communication way for realizing commands sfcfsd, commands sfcprmd, and communication between nodes is offered. Management of a composition database and a management partition I/O function are offered.
A daemon providing MDS/AC control functions such as GFS Shared File System operation start/stop, failover of MDS, and so forth.
Starting and stop, down surveillance of the process which constitutes a GFS Shared File System is performed. When a composition process starts and executes other demons and commands, a demand is transmitted to sfcprmd and sfcprmd executes a demon and a command according to a demand.
The process which transmits a demand is called client process and the process started from sfcprmd according to a demand is called target process.
A target process notifies the situation to a client process, when it is supervised by sfcprmd and a process carries out a normal end and unusual end.
One of operation modes of a shared disk device. Applications in each node can simultaneously access a shared disk device on their own. (Note that the terms shared disk device and shared disk have different meanings. To distinguish between the two terms, a "shared disk" may be referred to as a "shared disk for simultaneous access.")
Disk device connected to multiple nodes. FDU/FUs and disk arrays are available as PRIMECLUSTER shared disk devices. Shared disk devices can be designated as shared disks or switched disks according to whether multiple nodes are allowed to access them simultaneously. (Note that the terms shared disk device and shared disk has different meanings.)
A node sharing a GFS Shared File System. Up to 4 nodes are allowed.
Object set which belongs to shared disk class. Each object may also be referred to as shared class, shared group and shared disk.
A slice is an alias of a partition.
MDS node other than primary or secondary MDS node.
The super block contains information on the type of the file system, dates of creation and updating, label information, information on size and layout of the file system, and summary information on free areas.
A copy of the super block is created so that file system processing can continue even if the original super block is damaged by a block fault in the disk device.
The installation disk for a running Linux operating system. The system disk indicates the entire disk containing one of the following file system areas.
The update log contains the history of updates made to the file system structure. The history information is used to make a high-speed recovery of a file system possible. The area that contains the update log is called the update log area. Data in this area is overwritten cyclically.
The area storing update logs.
Update log data that was loaded into memory.
Update log replay updates meta-data in the update log area for which an update had been interrupted. This feature is used to recover the file system in the case of failures.
Directory blocks, symbolic link path names, and indirect blocks are collectively referred to as V-data. This data is stored in the V-data area that was allocated in the meta-data area.
The V-data area contains V-data. It is allocated in the meta-data area.
Software for system operation and management using the Web screen.
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