Server Management Midterm notes

michael.0lsn
Flashcards by michael.0lsn, updated more than 1 year ago
michael.0lsn
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Server Management Midterm notes

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Network/Server Management A single point of control to monitor and manage a networked system
Performance Management žISO's category for optimizing quality of service
Baseline Measuring the normal conditions of a Network or System through all stages of load
Fault Tolerance The term for preventing outages
ROI amount of value received relative to the amount of money invested
MTBF Average life span of a component
MTTR –The average amount of time that it takes to repair a component
AFR Yearly failure rate written as a percentage
HA Less than 8.8 hours of downtime per year
Workload Characterization –Number of User's a system can support and expected response time
Disaster Recovery Plan ža written plan describing the steps a company or individual would take to restore computer operations in the event of a disaster
RPO The point, to which applications must be recovered in order to get the business back online after a disaster
RTO Maximum allowable time to bring the applications (RPO) back online after a disaster
Backup Metadata Information about the backup data
Backup Catalogue A metadata database maintained by the backup server
Hot Backup A backup performed while the application is running
Differential only files that have changed since the last FULL backup
Incremental files that have changed since the last FULL OR INCREMENTAL backup
Synthetic full a full backup created on the backup device from full and incremental or differentials
Snapshots ž “Point in Time” images of live systems
CDP ž Backup system continuously track changes in data
Replication žkeep a second, synchronized copy of data on a separate system
HSM ž Use different types of storage media, (RAID, disk, tape) each representing a different level of cost and speed of retrieval when access is needed.
Deduplication find and delete duplicated on the storage system
SAN A network that moves storage data only, not client data
Rule 3-2-1 You should have at least 3 backup copies on a couple of different media with at least one of those copies offsite
Cloud Synched A backup folder or drive that looks local but is on the cloud
SAN backup architecture Backup data is moved via a separate network designed for storage only
Write penalty The number of extra operations it takes to perform a write on a RAID system
Disk IOPS Ÿ 1 / (average latency in seconds + average seek time in seconds)
Multicast cluster MAC each host in the cluster retains it's own MAC address as well as the MAC address of the cluster
RAID 0 Striped array with no fault tolerance
RAID 3 RAID that performs well under applications that just want one long sequential data transfer like video servers
RAID 5 RAID that has a write penalty of 4
RAID 6 RAID that can withstand the loss of two disks
IOPS ŸThe most common measurement of a storage systems overall performance
Distributed Computer Clustering – different parts of a program run simultaneously on two or more computers that are communicating with each other over a network
Parallel Computer Clustering – simultaneous execution of the same task (split up and specially adapted) on multiple processors in order to obtain results faster
Load Balancing each node in the cluster is configured to provide the same service each node in the cluster is configured to provide the same service
Quorum ›Configuration information for the cluster
Heartbeat ›A message sent between cluster nodes at regular intervals to determine node availability
Symmetric Cluster ž Every server in the cluster performs active work
Asymmetric Cluster žAlso called active/passive clustering
Round Robin cluster algorithm ›distributes the load equally to each server in the cluster, regardless of the current number of connections or the response time
Least-Connection cluster algorithm sends requests to servers in a cluster, based on which server is currently serving the fewest connections
9. What is the Multicast method of MAC addressing in clustering? You can distribute incoming client requests to cluster hosts by sending to adapter multicast MAC address. -used when you only have one nic per node
5 benefits of clustering -Improve availability -Improve performance -Improve scalability -Improve manageability -Load balancing
Deduplication Reduces size of stored data File level or Block level Finds repetitive data Deletion of duplicate data uses pointers instead of copies
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