Chapter 9 Sec + Flashcards
RAID
Redundant Array of Inexpensive Disks
RAID-0 Stripping
Doesn’t provide Fault tolerance or redundancy
-2 or more physical disks
-increases the read and write performance
If you have 2 HDD with 200g you have 400g in storage
RAID-1(Mirroring)
-uses 2 Disks
-Data written to one disk is written to other disk
-if one disk fails you still have data on the other
-if you have 2 HDD with 200 each
You have 200 GB in storage
RAID 5 and 6
-Raid 5 uses 3 disks that are striped together
-parity information is striped across each of the drives
-if one of the drives fails, the disk subsystem can read the remaining drive information and re create the original data
- if 2 or more drives fail the data is lost
Raid 6 same as 5
Except Raid 6 uses 4 disks total
- if 2 drives fail it will continue to operate
RAID 10
Combines the features of Mirroring (1) and striping (0) Raid
-minimum number of drives is 4
-Can add multiples of 2,4,6
-if you have (4) 500 GB drives you have 1Tb of usable storage
PDU
Power Distributed Units
Distribute power to devices similar to how a power strip delivers power via multiple outlets
-Monitors the quality of the Power such as Voltage,Current, and Power Consumption
NAS
Network Attached Storage
-Used for file Storage and is accessible on the Network
-provides file-level data storage allowing users to access files on NAS device and copy backup files to Nas devices
-uses standard Ethernet connection
SAN
Storage Area Network
-Provides block-level data storage via a full network
-org use Sans to provide highspeed across to Disk Arrays or Tape libraries
-As soon as data changes in it’s primary location it’s replicated to the SAN
-Typically uses Fibre Channel but can use Ethernet
BCP
Business Continuity Planning
-Helps an org predict and plan for potential outages or critical services or functions
-provides steps to return critical functions to operation after outage
BIA
Business Impact Analysis
Is an important part of BCP
-Helps an organization identify critical systems and components that are essential to the organization success
RTO
Recovery Time Objective
identifies the maximum amount of time it can take to restore a system after and outage
RPO
Recovery Point Objective
-Identifies a point in time where data loss is acceptable
MTBF
Mean Time Between Failures
-Provides a measure of systems reliability and is usually represented in hours
-Higher MTBF numbers indicate higher reliability of a product or system.
MTTR
Mean Time To Repair
-Identifies the average time it takes to restore a failed system.
-In some cases MTTR is interpreted as the Mean time to Recover
-Org s that have maintenance contracts often specify the MTTr as part of the Contract
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COOP
Continuity of Operations Planning
Focuses on Restoring mission -essential functions at a recovery site after critical outage
Such as moving to a recovery site
