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Cluster Administrators
- Cluster administrators administer the entire cluster and the virtual storage servers (Vservers) it contains.
- - administer entire cluster and it's resources
- - setup Vservers and delegate vserver administration to vserver administrators
- - admin account or role has capabilities to manage cluster and vservers
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VServer Administrator
- A Vserver administrator can administer a Vserver and its resources, such as volumes, protocols, andservices, depending on the capabilities assigned by the cluster administrator.
- - can only view their own data Vservers storage and resources (e.g volumes, LIFs, protocols, services)
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Cluster can be accessed through CLI (command-line interface) or web interface
- CLI - telnet, ssh, rsh
- Web - web browser (IE, firefox, chrome, etc)
- OpenSSH client and server version supported, only SSHv2 supported
- Supports max of 64 concurrent connections per node
- Only supports AES and 3DES encryption
- Telnet and RSH are disabled by default in firewall mgmt
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CLI Commands
- Cluster Shell - the default shell, provides commands needed to manager cluster and resources
- Node Shell - shell for commands at the node level, accessible through system node run
- System Shell - low level shell only used for diagnostics and troubleshooting, access only with guidance from technical support, diag account locked by default
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OnCommand System Manger
- manage storage systems and storage objects
- support ONTAP 8.2 and 8.1.2
- manage disks, volumes, qtrees, quotas
- configure protocols (CIFS and NFS, provisional file sharing)
- configure FC (fiber channel) and iSCSI (i-scuzy) protocols for block access
- configure network configuration settings in storage systems
- setup SnapVault and SnapMirror relationships
- Create and configure vServers and manage storage objects within Vserver, manage services
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Cluster Management
- Pair of nodes grouped together to form a cluster
- enable continuing service to users if one node goes offline
- can contain up to 24 nodes (FC and iSCSI limited to 8)
- quorum - precondition for a fully functional cluster, only one node can hold quorum at any time
- epsilon - extra voting weight if quorum comes up as a tie, defaulted to the first node, does not move to another node if first node goes down
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VServer Administration
- Virtual storage server (Vserver)
- contains data volumes and one or more LIFs (logical interface)
- can contain one or more FlexVol volumes or one infinite volume
- isolates virtualized data storage and network, appears as a single server to clients
- provide data access to clients without regard to physical storage or controller
- they provide benefits such as nondisruptive operation,scalability, security and support unified storage
- can be assessed through SSH, ONTAP API (web), SNMP
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Namespace
- logical grouping of volumes that are joined together at junction points to create asingle, logical file system that derives from the Vserver root volume
- each Vserver has a namespace
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Volume junctions
- a way to join individual volumes together into one namespace
- transparent to CIFS and NFS clients
- formed when a volume is mounted below the root to create a file tree
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Security Styles
- Unix, NTFS, mixed, Unified (only for Infinite Volumes)
- Determine what type of permissions ONTAP can use to control data access
- ONTAP preserves UNIX permissions when files are edited and saved by Windows application
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iSCSI (Internet small computer systems interface)
- enabled by default on all iSCSI logical interfaces (LIPs)
- enables you to transfer block data to hosts using SCSI protocol over TCP/IP, defined by RFC 3270
- In an iSCSI network, storage systems are targets that have storage target devices, which are referred to as LUNs (logical units)
- Uses a standard TCP/IP network
- Nodes: targets (storage systems), initiators (hosts)
- node identifiers: iqn (storage and initiators), eui (initiator)
- Default port: 3260
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FC (Fiber Channels)
- FC is a licensed service on the storage system that enables you to export LUNs and transfer blockdata to hosts using the SCSI protocol over a Fibre Channel fabric
- Nodes register with the FNS (Fabric Name Server) when connected to an FC switch
- Each FC node is identified through the WWNN (worldwide node name)
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ALUA (Asynchronise Logical Unit Access)
used on iSCSI and FC to determine optomized path between storage system and host
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MPIO (Multipath I/O)
- Provides more than one path between the controller and initiator
- provides high availability for iSCSI and FC
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Raid 4
- Provides single parity protection in case a single disk fails
- Min of 2 disks required, data disk and parity disk
- RAID4 mainly used by NetApp storage systems
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RAID-DP
- Uses dual parity to provide data protection if one of two disks fails
- Min of 3 disks needed, one data disk, one parity disk, and one dual parity disk
- The default RAID type for all aggregates
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