- Notes, cautions, and warnings
- About the Shared PERC 8 card
- Shared PERC
8 card features
- Physical disk power management
- Consistency Checks
- Virtual disk initialization
- Physical disk roaming
- FastPath
- Virtual disk migration
- Virtual disk cache policies
- Physical disk write cache policy
- Fault tolerance
- Multipath support
- Deploying the Shared PERC 8 card
- Driver installation
- Downloading drivers and firmware for Shared PERC 8 from the Dell support website for all operating systems
- Downloading drivers from the Dell Systems Service and Diagnostic Tools media for Windows
- Installing or updating Windows drivers for Shared PERC 8
- Installing or updating Linux drivers for Shared PERC 8
- Installing or updating VMware drivers for Shared PERC 8
- Multipath and clustering setup
- Management applications for Shared PERC 8 card
- Troubleshooting
- Performance variations between write-back and write-through cache modes
- Shared PERC 8 card boots into safe mode
- Degraded state of virtual disks
- General issues
- Physical disk
issues
- Incorrect Number of Virtual Disks Displayed In Windows Disk Manager
- Physical Disk In Failed State
- Unable to rebuild a fault tolerant virtual disk
- Fatal Error Or Data Corruption Reported
- Physical Disk Displayed As Blocked By Management Application
- Multiple Disks Become Inaccessible
- Rebuilding A Failed Physical Disk
- Virtual Disk Fails During Rebuild Using A Global Hot Spare
- Virtual Disk Fails During Rebuild Using A Dedicated Hot Spare
- Physical disk takes a long time to rebuild
- Controller cache issues
- SMART Errors
- Auto Replacement Member Errors
- Hard-Drive Indicator Patterns
- Getting help
Dell Shared PowerEdge RAID Controller (PERC) 8 For Dell PowerEdge VRTX Systems User’s Guide
Patrol Read
The Patrol Read feature is designed as a preventive measure to ensure physical disk health and data integrity. Patrol Read scans for and resolves potential problems on configured physical disks. The Dell Chassis Management Controller (CMC) can be used to start and control the features of Patrol Read.
The following is an overview of
Patrol Read:
- Patrol Read runs on all disks on the controller that are configured as part of a virtual disk, including hot spares.
- Patrol Read does not run on physical disks that are not part of a virtual disk or are in Ready state.
- Patrol Read adjusts the amount of controller resources dedicated to Patrol Read operations based on outstanding disk I/O. For example, if the system is busy processing I/O operation, then Patrol Read uses fewer resources to allow the I/O to take a higher priority.
-
Patrol Read does not run on disks involved
in any of the following operations:
- Rebuild
- Replace Member
- Full or Background Initialization
- Consistency Check (CC)
- NOTE: By default, Patrol Read automatically runs every seven days on configured SAS hard drives. Patrol Read is not necessary on SSD and is disabled by default.
- NOTE: In the event of a controller failover in systems with Fault Tolerant Shared PERC 8 card configuration, Patrol Read does not continue on the active controller. You must start Patrol Read again through CMC. If you do not start Patrol Read, it automatically starts on the active controller within seven days of the failover.
For more information on Patrol Read, see the Dell Chassis Management Controller for PowerEdge VRTX Online Help .
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