Term
| How many devices can a single (parallel) SCSI chain handle ? |
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Definition
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Definition
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Term
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Definition
| must have unique identifier. |
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Term
| SCSI BUS can support how many devices? |
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Definition
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Term
| commonly occurring Direct Attached Storage implementation in Open System environments is |
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Definition
| parallel SCSI chain (most common, though can use IDE) |
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Term
Client-Server Model Terms:
Client
Server
Cable |
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Definition
Client: Controller or Initiator
Server: Device or Target
Cable: Interconnect |
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Term
| SANs use these data protocols |
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Definition
| Fibre Channel (Serial SCSI-3 over FC) or iSCSI is Serial SCSI-3 over IP |
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Term
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Definition
1) Redundancy w/ dual/multiple host connection options
2) Use networking technologies to solve connectivity and distance limitations of traditional channel based storage architecture
3) Use of dedicated netowkr reduces impact on corporate communication network
4) Non-disruptive provisioning of additional storage resources. Devices can be added/removed w/o affecting other hosts in the fabric.
5) Allowing multiple servers to share access to external storage devices, utilization and availability of critical data is significantly improved.
6) Consolidation of peripheral resources and maximization of data |
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Term
| Storage Area Networks benefits ILM |
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Definition
1) Flexibility: Allows storage assets to be deployed as needed
2) Availability: Builds redundancy depending on the need of end applications
3) Accessibility: Provides Resources as needed
4) Scalability: Builds connectivity as the needs increase
5) Security: Controls Access in a shared environment |
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Term
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Definition
| Defines physical layer of the model. Defines standards for connectivity media, connectors, and transmission methods. These standards currently define a physical layer data rate of up to 200 MBps or 2 Gbps. |
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Term
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Definition
| Defines encoding layer. Uses 8b/10b |
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Term
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Definition
Defines construction of basic data frame, methods of frame sequencing and flow control. Frame size is 2148 bytes.
Frames, Sequences, Exchanges, Buffer Credits |
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Term
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Definition
| Defines common services used in a switch. Data striping. Mirroring. Multipathing. |
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Term
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Definition
| Where all upper level protocols or ULP get mapped. Logical connection bwtn 2 protocols (ULP). Each ULP requires a unique FC-4 mapping. |
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Term
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Definition
| SCSI, HIPPI, ESCON, ATM, and IP |
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Term
| What are the speeds of LC and SC Fibre? |
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Definition
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Term
Multicode cable:
distance
microns
speed |
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Definition
500m or less
62.5 or 50 microns
100 or 200 MHz/Km |
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Term
Single mode cable:
diameter
distance |
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Definition
9 microns
distance limitation based on power of laser at transmitter and sensitivity of receiver |
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Term
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Definition
| Frames, Sequences, Exchanges, Buffer credits, topologies, classes of services, and ports |
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Term
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Definition
| DB-25, 50-pin ribbon, and 68-pin high density |
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Term
| Paralle or Serial SCSI requires SCSI bus to be terminated? |
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Definition
Parallel SCSI requires termination:
Passive: less than 3 ft
Active: Fast SCSI (10 MB) and Fast Wide (20MB) and more than 3 ft |
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Term
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Definition
1) Singled-ended
2) High-voltage differntial
3) Low-voltage differential |
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Term
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Definition
| Way that electrical impulses are sent across wires |
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Term
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Definition
| Class 1: Ack connection oriented
Class 2: Ack connectionless service
Class 3:Unack connectionless
Class 4: Connection Oriented Fractional BW
Class F: Inter-switch communication format |
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Term
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Definition
N_Port= Creates/receives frames
NL_Port= Arbitrated Loop enviro
F_Port=Fabric Port; port on switch connected to node
FL_Port= Fabric with a Loop
E_Port=Expansion port (connects switches)
G_Port = Generic Port (port auto-configures to other port types) |
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Term
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Definition
| Used for routing of frames from source to destination. 24-bit address (6 characters). Dynamically assigned. Identifies the location of the device in the switch |
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Term
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Definition
| Used to identify entities: ie, ports. 64-bit address (16 characters). Fixed factory assigned or software generated address. Made of WWPN and WWNN. Factory-set on HBAs or may be software-generated for storage ports. WWN Formats are based on IEEE company ID. |
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Term
| When is the FC Address assigned? |
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Definition
| When the node entersthe loop or is connected to a switched fabric |
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Term
| What is the Domain Field? |
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Definition
| Unique identification number provided to each switch in the fabric. XX of the FC Address |
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Term
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Definition
| Location of the port on the switch from where the data frame originates. YY of the FC Address |
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Term
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Definition
| ALPA of the device. AL_PA (loop ID) of the NL_Port. |
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Term
| In an arbitrated loop, which parts of the FC Address are null? |
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Definition
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Term
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Definition
1) Point-to-Point
2) Arbitrated Loop (FC-AL)
3) Switched Fabric (FC-SW) |
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Term
| What is Point-to-Point FC Topology? |
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Definition
| Devices connected directly to each other |
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Term
| What is Arbitrated Loop FC Topology? |
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Definition
| Devices attached to a shared "loop". Analogous to Token Ring. |
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Term
| What is Switched Fabric (FC-SW) of the FC Topology? |
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Definition
| All devices connected to a "Fabric Switch" -- Analogous to an IP switch. Initiators have unique dedicated I/O paths to Target. |
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Term
| What is the number of devices in a FC-AL? |
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Definition
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Term
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Definition
| Serial SCSI-3 and IP. SCSI-3 over Fibre Channel is also commonly referred to as the "Fibre Channel Protocol" or FCP. |
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Term
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Definition
| one or more switches (virtual / logical) |
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