CHAP 3.2 Data Access

Question 1

direct attached storage (DAS)

Answer 1

• consists of internal/external disks connected directly to the storage controllers in the host
• interface protocol: scsi, sata

Question 2

das advantages & disadvantages

Answer 2

adv: easy to configure and inexpensive
disadv: slower and isolated bc the disks are attached to a single server

Question 3

network-attached storage (NAS)

Answer 3

• an ip-based, high performance file sharing and storage device
• support file sharing protocol e.g network file system, server msg block

Question 4

nas advantages & disadvantages

Answer 4

adv: relatively inexpensive, centralized storage at affordable price, easy to configure
disadv: slower access times, not an enterprise solution

Question 5

storage area network (SAN)

Answer 5

• high-speed network of servers and shared storage devices

- common SAN deployments: FC SAN, IP SAN

Question 6

san adv & disadv

Answer 6

adv: fastest access times, easily expandable, centralized storage, high level of redundancy
disadv: more expensive, requires specialized skills

Question 7

fibre channel

Answer 7

• high speed nwk technology
• can support up to 128 Gb/s
• uses FC switches to form a switched fabric
• runs on optical fibre cables but can also run on copper cabling
• used to connect data storage to servers and between data centres
• highly scalable, support up to 15 mill devices

Question 8

ip san protocol: iSCSI

Answer 8

• supports access to remote, SCSI-based storage devices

- can run over pre-existing switching and IP infra

Question 9

components of iSCSI

Answer 9

• iSCSI initiator: client using software (driver) or hardware (iSCSI host bus adapter) to send data to an external iSCSI-based storage array
• iSCSI target: storage array w iSCSI port, provides LUN access
• IP network

Question 10

ReFS (resilient file system)

Answer 10

• only supported on wdws 8, wdws server 2012 and above

- doesnt support file compression, EFS or disk quotas (ntfs supports all)

Question 11

effective permissions

Answer 11

1. ntfs permissions are CUMULATIVE
2. permissions are inherited
3. file permissions override folder permissions
4. deny overrides all permissions
5. creators of files and folders are their owners
6. when share and ntfs permissions are active, most restrictive (minimum) permission is applied