EMC Updated E20-598 Exam Questions and Answers by prince

Explanation/Reference:

Server maintenance activity monitoring

Avamar performs the system maintenance operations for backup data on the Data Domain system, includingHFS checks, checkpoints, rollbacks, garbage collection, and secure backup deletion.

The ddmaint utility implements all required operations on the Data Domain system for the Avamar server.The ddrmaint utility is installed on the utility node of a multi-node server, or the single node of a single-nodeserver, during Avamar server installation. The ddrmaint utility is not installed on the data nodes of the Avamarserver.

The ddrmaint utility logs all maintenance activities on the Avamar server in the ddrmaint.log file. Thefollowing directory on either the utility node of a multi-node server or the single node of a single-node servercontains the log file:

/usr/local/avamar/var/ddrmaintlogs/ddrmaint.log

The ddrmaint.log file is rotated when it reaches 25 MB in size.

Explanation/Reference:

Explanation/Reference:

http://gregandthenetwork.blogspot.com/2013/12/design-imapact-of-avamar-system.html

Garbage Collection is the single most important process to ensure a consistent state of the Avamar. If garbagecollection is running, the system is in a read-only state and no other maintenance or backup can run.

Coincidentally, if backup is still running, garbage collection will not begin. Garbage collection can free up about10GB/node/hour once the Avamar is in a steady state, but this will take longer as utilization of the Avamargrows.

Explanation/Reference:

Capacity Threshold Warnings:

80% of user capacity = warning, start planning for expansion or cleanup

95% user capacity is the health check warning, new backups are suspended

100% user capacity makes the Avamar read-only, can still restore from server

85% of OS capacity = Garbage collection stops running, utilization increases rapidly

90% OS capacity = HFS checks stop running

96% OS capacity = no more checkpoints