3Ware 9550SXU16MLB10 User Guide - Page 130

Moving a Unit to Another Controller During Migration, About Self-tests, Setting Background Task Rate

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Maintaining Units Once a unit is put into the migration state, it must be allowed to complete the process. While migrating, rebuilds or verifies to the unit are not permitted. Migrate tasks are always done in the background, and can be initiated through either 3DM or the CLI. (Foreground migrations through 3BM are not supported.) A unit be migrated can still be used (I/O still continues), however the performance will be affected while the migrating task is active. You can control how much affect this has on performance by setting the background task rate. For more information, see "Setting Background Task Rate" on page 124. Moving a Unit to Another Controller During Migration Moving a unit to another controller while the unit is in the migration state is supported with one restriction. If the unit was in the middle of the migration process and the controller was shutdown uncleanly, the unit cannot be moved to another controller until the unit has recovered from the unclean shutdown. For more information about migration, see "Changing An Existing Configuration" on page 98. About Self-tests Two self-tests can be set, to check whether UDMA Mode can be upgraded, and whether SMART thresholds have been exceeded. Initially, these tests are set to run every 24 hours. You can change the schedule for when they are run, and you can disable the tests, if you prefer not have to have them performed. For more information, see "Selecting Self-tests to be Performed" on page 129. Setting Background Task Rate In 3DM, you can set the relative performance of background tasks (initializing, rebuilding, and verifying) in relation to normal I/O activity. 9000-series controllers show separate settings for Rebuild Rate and Verify Rate. (Initialization occurs at the Rebuild rate.) 7000- and 8000-series controllers show only one setting for Task Rate, which applies to both rebuild and verify rates. Rebuild and verify tasks can be started manually or scheduled. For details about manually starting these processes, see "Rebuilding Units" on page 130 and "Verifying a Unit through 3DM" on page 135. For details about scheduling rebuild, verify, and other tasks, see "Scheduling Background Tasks" on page 125. 124 3ware 9000 Series Serial ATA RAID Controller User Guide

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Maintaining Units
124
3ware 9000 Series Serial ATA RAID Controller User Guide
Once a unit is put into the migration state, it must be allowed to complete the
process. While migrating, rebuilds or verifies to the unit are not permitted.
Migrate tasks are always done in the background, and can be initiated through
either 3DM or the CLI. (Foreground migrations through 3BM are not
supported.)
A unit be migrated can still be used (I/O still continues), however the
performance will be affected while the migrating task is active. You can
control how much affect this has on performance by setting the background
task rate. For more information, see “Setting Background Task Rate” on
page 124.
Moving a Unit to Another Controller During Migration
Moving a unit to another controller while the unit is in the migration state is
supported with one restriction. If the unit was in the middle of the migration
process and the controller was shutdown uncleanly, the unit cannot be moved
to another controller until the unit has recovered from the unclean shutdown.
For more information about migration, see “Changing An Existing
Configuration” on page 98.
About Self-tests
Two self-tests can be set, to check whether UDMA Mode can be upgraded,
and whether SMART thresholds have been exceeded.
Initially, these tests are set to run every 24 hours. You can change the schedule
for when they are run, and you can disable the tests, if you prefer not have to
have them performed. For more information, see “Selecting Self-tests to be
Performed” on page 129.
Setting Background Task Rate
In 3DM, you can set the relative performance of background tasks
(initializing, rebuilding, and verifying) in relation to normal I/O activity.
9000-series controllers show separate settings for Rebuild Rate and Verify
Rate. (Initialization occurs at the Rebuild rate.) 7000- and 8000-series
controllers show only one setting for Task Rate, which applies to both rebuild
and verify rates.
Rebuild and verify tasks can be started manually or scheduled. For details
about manually starting these processes, see “Rebuilding Units” on page 130
and “Verifying a Unit through 3DM” on page 135. For details about
scheduling rebuild, verify, and other tasks, see “Scheduling Background
Tasks” on page 125.