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“Scenario: Losing a Hard Drive Containing eDirectory in a Multiserver Environment” on
page 483
“Scenario: Losing an Entire Server in a Multiple-Server Environment” on page 485
“Scenario: Losing Some Servers in a Multiple-Server Environment” on page 486
“Scenario: Losing All Servers in a Multiple-Server Environment” on page 486
16.10.1 Scenario: Losing a Hard Drive Containing eDirectory in
a Single-Server NetWork
Indira is the administrator for a single-server network at Stationery Supply, Inc. Indira can't rely on
replication for fault tolerance, because her environment has only one server. The new Backup
eMTool functionality in eDirectory 8.7.3 provides a simple solution for Indira to back up and restore
eDirectory. It's server-centric and it's fast.
After upgrading her Windows server from eDirectory 8.6.2 to eDirectory 8.7.3, Indira sets up
unattended backups for her server using batch files to run the Backup eMTool.
Indira wants to do a full backup of eDirectory every Sunday night, and an incremental backup every
weeknight. She sets the unattended backups to run shortly before her full and incremental file
system backups each night, so her tape backups contain the eDirectory backup files as well as the
file system data. She has contracted with a remote data storage company to send the tape backups
offsite.
Every Monday morning, Indira checks the backup log to make sure the full backup was successful.
She also checks the logs occasionally during the week to make sure the incremental backups were
successful.
Indira decides not to turn on roll-forward logs for the following reasons:
She does not have a separate storage device on her server, so turning on roll-forward logs
would not provide any additional backup of eDirectory. If there were a storage device failure,
the logs would be lost along with eDirectory, so there is no point in creating them.
The tree does not change very much, and she is satisfied with being able to restore only up to
last night's backup. She doesn't need to be able to restore eDirectory to the moment before a
failure.
Because the server does not participate in a replica ring with other servers, roll-forward logs are
not required for the restore verification process to be successful.
Stationery Supply, Inc. decides to reorganize the staff, so Indira does a manual backup before and
after making significant changes to the tree. Her strategy is to make a new backup of changes during
the middle of a weekday when necessary, instead of running roll-forward logs all the time.
To make sure her backup strategy is ready to go when she needs it, Indira tests it occasionally. She
doesn't have the budget to purchase a second server for testing, so she makes arrangements with a
test lab in her town. Using a server like hers in the test lab, she installs her operating system and tries
to approximate the environment of her eDirectory database. She restores her backups and checks to
make sure eDirectory is restored as she expects.
One Wednesday morning, the hard drive containing eDirectory on the server has a failure. Indira
obtains a new hard drive and the backup files from the full backup on Sunday evening, the
incremental backup on Monday evening, and the incremental backup on Tuesday evening. She
installs the new hard drive and installs eDirectory on it. Then she restores the full and incremental
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