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39 Cards in this Set

  • Front
  • Back
What is the cause of most Exchange failures?
hardware failure
How are physical corruption problems recovered from?
restore from backup
Where do most logical corruptions occur?
at the database level
What are the three most common event log errors when physical corruption occurs?
1018: data read from disk does not match data written to disk; 1022: hardware, device driver, or OS is returning errors; 510: out of disk space or disk failure
Why are online backups the best way to detect a database corruption?
it is the only process that systematically checks every page in the database
Why is running Eseutil.exe in repair mode not recommended for repairing physical database corruption?
Eseutil simply deletes bad pages- data will be lost
What command must be run to get Exchange to a consistent state after running Eseutil /p?
Isinteg -test alltests -fix
What program is used to check problems with the information store?
Isinteg
What program is used to check problems with the database engine?
Eseutil
When should Isinteg and Eseutil be used?
when restoring from backup is unsuccessful
Do Exchange services continue to run during an online backup?
yes
What does Exchange use to track pages updated during an online backup?
a .pat file
What happens if a .pat file is not present during an online backup?
pages modified during backup won't be backed up
What are the two .pat files?
pub.pat and priv.pat
What is the biggest result of a system crash that does not corrupt a database? How is it recovered?
loss of memory contents- system will perform a soft recovery on restart
If an Exchange server crashes, how does it signal that a soft recovery should be performed?
the database is flagged as inconsistent
What is the most time-consuming part of an Exchange restore?
replaying the log files
What is the average restore time for a large Exchange server?
several hours
Why does replaying the log files during a restore take so long?
the database engine must process every transaction that has occurred since the last backup
What is the average time range to replay a given log file during a restore?
30 seconds to 4 minutes
What must be done for users to be able to recover messages that have been deleted?
Recover Deleted Items must be enabled on the server
What is one of the most important maintenance tasks that Exchange performs automatically?
defragmenting the database
Where does Exchange display an estimate of free space after online defrags?
in the Event Log
What task does Exchange NOT do during an online defrag?
shrink the size of the database files on disk
When might you consider performing an offline defrag?
when major changes have been made which will affect the size of the databases
What command will perform an offline defrag?
Eseutil /d
What does an offline defrag do?
creates a new database file and copies all data to the new file
How long does an average offline defrag take?
1 hour per 5-10 Gb
How much free space should you have before performing an offline defrag?
twice the size of the databases
How much extra disk capacity should be allowed to run Eseutil and Isinteg?
25-30%
What are two reasons for using high-quality hardware?
hardware failures increase the chance of losing data, and slow hardware may become a bottleneck
Why should you be skeptical of OEM performance benchmarks for RAID?
they typically test using RAID 0
What two Exchange components should be placed on different disks?
the transaction logs and the database files
What is considered a large information store?
50-100 Gb
What Exchange component benefits most from being placed on a high-performance disk?
the transaction logs
Why should you use a dedicated partition for the database files?
the databases use a lot of I/O as they get bigger
What partition should the MTA database and tracking logs be placed on, if they do not have a dedicated partition?
the system partition
What kind of backup rates can you expect with high-quality components?
20-40 Gb/hour
What kind of restore rates can you expect with high-quality components?
10-25 Gb/hour