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ISM v5 > Module 7: IP SAN, FCoE, NVMe-OF (iSCSI Overview) > Flashcards

Module 7: IP SAN, FCoE, NVMe-OF (iSCSI Overview) Flashcards

1
Q

How does iSCSI work?

A

SCSI commands/data placed as payload into IP packets - TCP/IP protocol provides reliability and flow control

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2
Q

How does the SCSI protocol change in iSCSI?

A

remains unchanged even when transported over Fiber or FC

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3
Q

How does iSCSI identify devices to send data to and from?

A

SCSI IO protocol uses Initiator and Target labels

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4
Q

What is a source device in iSCSI?

A

typically a compute node - request connection to storage device that contains data to read/write

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5
Q

What is a target device in iSCSI?

A

storage devices that responds/establishes connection to source

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6
Q

What are the key components of an iSCSI communication?

A

iSCSI Initiator (EX: iSCSI HBA)
iSCSI Target (EX: SAN)
IP-Based Network (Gigabit Ethernet LAN)

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7
Q

How do software iSCSI initiators work?

A

performed by server OS - consumes CPU that takes performance from apps

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8
Q

What is the benefit of a hardware iSCSI initiator?

A

removes the processing demand from the server CPU

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9
Q

What is a hardware iSCSI initiator?

A

dedicated host based NIC to handle iSCSI processing functions

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10
Q

What are the types of iSCSI initiator setups?

A

Standard NIC w/ software iSCSI adapter
TOE NIC w/ software iSCSI adapter
iSCSI HBA

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11
Q

What are the advantages of software iSCSI initiators?

A

allow standard embedded or Ethernet NICs to be used
least expensive and easy to implement

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12
Q

What is a TOE NIC?

A

offloads TCP/IP processing from server CPU - leaves only iSCSI functionality to be processed

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13
Q

How does TOE NIC w/ software iSCSI adapter work?

A

compute passes the iSCSI info to the TOE NIC and then the TOE NIC sends info to target over TCP/IP

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14
Q

What makes TOE NIC w/ software iSCSI adapter better than Standard NIC w/ software iSCSI adapter?

A

improves performance by offloading some workloads - iSCSI still handled by CPU though so still pulls performance

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15
Q

What is an iSCSI HBA?

A

a hardware adapter w/ built in iSCSI functionality - offloads entire iSCSI and TCP/IP processing from CPU - most expensive way

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16
Q

What is a Native iSCSI setup?

A

iSCSI initiators attached to iSCSI targets directly through IP network - no FC components

17
Q

What is a Bridged iSCSI setup?

A

iSCSI initiators are attached to IP network - storage systems attached to FC SAN - iSCSI gateway provides bridging functionality

18
Q

What is an iSCSI Address?

A

logical path to an iSCSI initiator or target

19
Q

What does an iSCSI Address consist of?

A

Location of iSCSI initiator or target (IP Address + TCP Port Number)
iSCSI Name (unique identifier for iSCSI network)

20
Q

What are the three types of iSCSI Names?

A

iSCSI Qualifed Name (IQN)
Extended Unique Identifer (EUI)
Network Address Authority (NAA)

21
Q

What is a VLAN?

A

one or more logical Ethernet LANs that operate over single physical Ethernet LAN

22
Q

What are VLANs used for?

A

to isolate communication between a group of nodes indpendent of physical location across the network

23
Q

What is the physical LAN for in a VLAN?

A

used to provide hardware level connectivity and maintain transport paths

24
Q

Why are VLANs well suited for iSCSI networks?

A

enable full iSCSI traffic isolation from from other non-SAN traffic - provides high security

25
Q

What is VLAN tagging?

A

performed by inserting 4 byte tag field containing 12-bit VLAN ID into the ethernet frame before its transmitted through an interswitch trunk

26
Q

How many VLANs can a VLAN TAG address up to?

A

4096 VLANS

27
Q

How does VLAN tagging work?

A

switch reads VLAN tag and forwards Ethernet frame to port assigned to VLAN ID

28
Q

What does TOE stand for in TOE NIC?

A

TCP Offload Engine

29
Q

What do you need to have a Bridged iSCSI environment?

A

MP (multiprotocol) Switch - also called iSCSI gateway

ISM v5 (32 decks)

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