What is the maximum number of simultaneous backups that can be performed using an EMC Avamar NDMP accelerator with 32 GB of RAM for EMC Celerra DART 6?
What are the three OS user accounts used by the EMC Avamar server for authentication?
A multi-node EMC Avamar server is backing up clients worldwide. What must the storage administrator keep in mind to help ensure that backup schedules do not conflict with the Avamar server blackout window?
Which EMC Avamar replication mode allows for many-to-one and bi-directional replication?
On which cluster node(s) is the Avamar Windows File System client installed in a Microsoft Windows 2008 cluster?
By default, how many simultaneous client connections are supported by an EMC Avamar Virtual Edition server?
The total number of client connections which can be made to the Avamar server will vary according towhich operations are currently running, how the connection is made and the number of data nodeswhich are online.
Various parameters in the /usr/local/avamar/var/mc/server_data/prefs/mcserver.xml file govern thisbehavior.
The number of concurrent jobs for the whole grid will not exceed max_current_jobs.
AVE 7 is#
Assisted Ref# https://emc--c.na5.visual.force.com/apex/KB_HowTo?id=kA0700000004Nlp
Based on EMC best practice, what is recommended when creating Avamar domains?
Refer to the exhibit.
Shown is a diagram of the domain structure of an EMC Avamar server. How does this domain structure deviate from best practices?
A customer has a remote client with over 4 TB of file data that needs to be backed up to a local Avamar server.
What is a best practice to perform the initialization?
Best Practices for Adding Large Filesystem Clients
-Ensure the file cache is sized properly
-Work with support / account teams to investigate using cache prefixing for clients with many millions of files
-For initial backups:
On low capacity grids, use overtime to allow the backup to complete
On higher capacity grids, allow the client to time out daily and rely on partial backups
For clients that will not complete within 7 days, start with a small dataset and gradually add more files anddirectories to avoid issues with parials backups expiring before the initial backup completes
-For incremental backups:
Typical backup performance is about 1 million files per hour
Generally the client disk performance is the bottleneck but be sure to confirm the bottleneck before makingany performance tweaks
Which four account management actions can be performed from the EMC Client Manager interface?
An EMC Avamar customer, without premium support, has a requirement to recover from a failed storage node.
What is the minimum number of nodes, of all types, required to support this functionality?
What would you run to determine if your EMC Avamar server is running in a steady state?
What happens when files fail to find a match in the file cache during a backup of an EMC Avamar client computer?
Which command is used to convert new Avamar nodes to storage nodes?
A storage administrator is troubleshooting an EMC Avamar client that is failing with "Time Out - Start". Which log is the first place to check?
The location of the client logs will vary depending on the platform:
On Windows: C:\program files\avs\var\
On Linux: /usr/local/avamar/var
On other UNIX platforms: /opt/AVMRclnt/var
On NetWare: sys:\avamar\var
On MAC: /private/var/avamar
You can retrieve maintenance logs (checkpoint, hfscheck, gc) using the "dumpmaintlogs" command and the
GSAN itself logs errors in /data01/cur/err.log on each node but in general.
A company has just deployed a VMware environment. The EMC Avamar storage administrator wants to ensure they receive the highest level of deduplication within the environment for backups.
Which type of backup should be performed?
A storage administrator has successfully configured EMC Avamar to use Microsoft Windows Active Directory external authentication. Which accounts and/or interfaces can be accessed by users set up to use this authentication?
According to EMC best practices, what is recommended when planning for an EMC Avamar client deployment?
What is considered a CRU (Customer Replaceable Unit) for Avamar Gen4?
Which port does EMC Avamar use to access the Management Console database for reporting?
Which size Avamar Gen4 storage node is supported for a RAIN configuration?
For Gen4 3.9TB node:
Raw capacity is 6 TB and licensed capacity is 3.9 TB
For Gen4 7.8 TB node:
Raw capacity is 12 TB and licensed capacity is 7.8 TB
So, In a RAIN config with 1 utility node and 4 storage nodes (7.8 TB), the total capacity should be 48 TB andtotal licensed capacity is 31.2 TB
In which directory are the EMC Avamar administrator logs located?
An EMC Avamar system is integrated with an EMC Data Domain system. When a backup has expired on the Avamar server, what is the impact to the backup data stored on the Data Domain system?
At which percentage of user capacity are new backups suspended in an EMC Avamar environment?
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
What is the recommended command that instructs the EMC Avamar server to redistribute backup data from the most full nodes to the least full nodes?
Which type of database does EMC Avamar use to store information about backups?
Which tool is used to move a client to a new domain in EMC Avamar 6.0?
A company with a multi-node EMC Avamar Data Store has experienced a catastrophic disk failure due to a RAID controller error on a storage node.
Which fault tolerance feature provides protection against data corruption on that node?
I am sure answer is NOT A
As assessment I was selecting A which is not valid in the results
Avamar ensures protection from disk and data corruption through the use of RAID (redundant array ofindependent disks). The type of RAID depends on the particular node type.
The phases of hfscheck mentioned above run in the following sequence:
During the indexsweep phase, the system confirms the integrity of the index (the index is the "table of contents"for all the data on the system) and also caches the index entries for each data chunk onto the same disk wherethe chunk itself is stored. This is done to improve the performance of later phases of the hfscheck.The datasweep phase is typically the longest phase of hfscheck. This phase reads each data chunk from thesystem and compares the hash of that chunk with the hash that is recorded in the index. This confirms thateach data chunk is the same as it was when it was backed up.
As I'm sure you know, multi-node Avamar systems are protected by RAIN parity. During the paritysweepphase, the parity information is recalculated and checked against the parity information on disk.
The refcheck phase of hfscheck checks the referential integrity of the backups by verifying that every chunk ofdata that is referenced by a backup can be found in the index.
When sizing a large database server on an EMC Avamar, how many bytes per entry are added to the hash cache?
The most important thing to do on a client with so many files is to make sure that the file cache is sizedappropriately. The file cache is responsible for the vast majority (>90%) of the performance of the Avamarclient. If there's a file cache miss, the client has to go and thrash your disk for a while chunking up a file thatmay already be on the server.
So how to tune the file cache size?
The file cache starts at 22MB in size and doubles in size each time it grows. Each file on a client will use 44bytes of space in the file cache (two SHA-1 hashes consuming 20 bytes each and 4 bytes of metadata). For 25million files, the client will generate just over 1GB of cache data.
When data is being backed up to an EMC Data Domain system in an Avamar environment, where is the backup metadata stored?
An EMC Test Lab manager has asked you to implement Avamar 6 on their EMC Avamar Data Store (ADS) Gen3 that is currently running Avamar 4.0.
Can this Avamar ADS Gen3 server be made to run Avamar 6?
Not sure about the original answer!!
Road Map for Avamar 6#
Road Map for Avamar 7#
Which type of EMC Avamar Gen4S node supports SAS drives?
An EMC Avamar storage administrator has 400 Microsoft Windows clients; 350 are production and 50 are development. The administrator wants to replicate only the production servers.
If Enterprise Manager is used to only include the production servers, what will be replicated?
Which interface is used to start Avamar Client Manager?