A directory service that implements LDAP in a Windows environment. It provides a hierarchical structure for organizing access to data.
The password required to log into the Management screens of Appliance Manager
Virtual network interface that consists of real interfaces working in tandem. A virtual interface can provide the aggregated bandwidth of all of the interfaces that you used to create it.
A number associated with a node that is used by the CXFS software and appears in messages.
Challenge Handshake Authentication Protocol is a means of authentication used between a client and server where the password is sent over the wire in a form that is impossible to discover and impossible to replay. Both client and server must know what the original password is, but someone snooping on wire traffic cannot recover the password and cannot later send the original (snooped upon) authentication packet to the server in an attempt to try to trick it into letting them authenticate as a valid client.
Common internet filesystem. This protocol is usually used by Microsoft Windows clients.
A node in a CXFS cluster that does not run cluster administration daemons and is not capable of coordinating CXFS metadata.
A cluster is the set of systems (nodes) configured to work together as a single computing resource. A cluster is identified by a simple name and a cluster ID. In CXFS, a cluster running multiple operating systems is known as a multiOS cluster.
Metric drawn live from the server or taken from the last few minutes of the metric archives.
Clustered XFS filesystem.
Disk cache manager, which lets you configure the DMF disk MSP to manage data on secondary storage, allowing you to further migrate the data to tape as needed.
The IP address of the router that this system should use to communicate with machines that are outside of its subnet.
Dynamic host configuration protocol (DHCP) allows one or more server systems to dynamically distribute network IP addresses and site configuration parameters to new or requesting client systems. By using DHCP, a site with only a few available addresses can serve a large number of hosts that connect to the network only occasionally, or a large site can manage the permanent assignment of addresses with a minimum of administrative attention. The NAS server can be configured as a DHCP client.
See name service.
Disk I/O per second.
Writing data in units to multiple disks in a round-robin fashion, increasing IOPS performance.
The amount of data that is transferred to and from disks.
A unique identifier for an entry in an LDAP directory tree structure.
Data Migration Facility, a hierarchical storage management system for SGI environments.
Domain name system
Distributed Replicated Block Device. See http://www.drbd.org/.
In DCM, a cache-resident copy of a migrated file that has already been copied to tape, and can therefore be released quickly in order to prevent the cache filling, without any need to first copy it to tape
Fibre Channel storage interface connection.
The isolation of a problem node so that it cannot access I/O devices, and therefore cannot corrupt data in the shared CXFS filesystem.
Fully qualified domain name.
1024 megabytes (also known as gibibyte). On the DMF Configuration screens, disk sizes use multipliers that are powers of 1000, such as kB, MB and GB. This is for consistency with the DMF documentation and log files. However, the rest of Appliance Manager, including the DMF Monitoring screens, use multipliers that are powers of 1024, such as kiB, MiB and GiB.
Metric taken exclusively from the metric archives.
Disk drive within a RAID array that is not used unless another drive within the RAID array fails, at which point it is added to the filesystem to replace the failed drive without shutting the filesystem down or interrupting service.
Time that remained when the CPU could not find any tasks to run.
The client accessing the storage in an iSCSI network.
Time the CPU spent processing requests from I/O devices. In a storage server context, these are almost exclusively generated by disk operations or network packets and by switching between processes.
See fence.
I/O per second.
Intelligent Platform Management Interface, a system reset method.
IP over InfiniBand.
Internet Small Computers Systems Interface is a protocol that is used to transport SCSI commands across a TCP/IP network. This allows a system to access storage across a network just as if the system were accessing a local physical disk. In an iSCSI network, the client access the storage is called the initiator. The remote storage that the client accesses is called the target .
Lightweight directory access protocol (LDAP) is a networking protocol that organizes access to data in a directory tree structure.
Key distribution center
Information that describes a file, such as the file's name, size, location, and permissions.
The node that coordinates updating of metadata on behalf of all nodes in a CXFS cluster.
Media-specific process, the daemon-like process in DMF by which data blocks are copied onto alternate media, and which assigns keys to identify the location of the migrated data.
Application that manages the information associated with network users.
Computer running a program that accesses the storage server.
Network file system.
Network interface card.
Network information service (NIS) is a network lookup service that provides a centralized database of information about the network to systems participating in the service.
A node is an operating system (OS) image, usually an individual computer. (This use of the term node is different from the NUMA definition for a brick/blade on the end of a NUMAlink cable.) See also client-only node .
A file in DCM that is not a cache-resident copy of a migrated file. It must be migrated to tape before it can be removed.
Network Time Protocol.
The combination of multiple RAID disk drives into a single logical unit.
Redundant array of independent disks.
A level of RAID that uses block-level striping and distributed parity.
In the context of the Appliance Manager interface, a resource is something that is monitored and managed by Appliance Manger (such as network interfaces or DMF).
Serial advanced technology attachement storage interface connection.
Task performed by the storage server.
A file that is protected from all access by non- root users and stores the encrypted passwords.
A tool that is used to communicate between nodes in the cluster. See http://www.openssh.com/ .
The gateway server where email should be delivered.
See XVM snapshot.
Time the CPU spent executing kernel code. This is usually dominated by NFS file serving and accessing data from disks.
The number of slots used by DMF, other applications, or vacant.
The storage that appears to the initiator as a disk drive in an iSCSI network.
Tape Management Facility.
Volume group, one of the components of a DMF library server. A volume group is responsible for copying data blocks onto alternate media.
Time when a CPU was forced to do nothing while waiting for an event to occur. Typical causes of wait time are filesystem I/O and memory swapping.
A filesystem implementation type for the Linux operating system. It defines the format that is used to store data on disks managed by the filesystem.
Virtual point-in-time image of a filesystem. Snapshot copies are not actual media backup for a filesystem.
An operating system setup and configuration tool.