- 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
FastPath
The Shared PERC 8 card supports FastPath feature, which improves application performance by delivering high I/O per second (IOPS).
Under specific conditions with FastPath, the I/O bypasses the controller cache and is committed directly to the physical disk from the host memory or directly from the physical disk. All simple non-spanned virtual disks configured with Write-Through write-cache policy and No Read-Ahead read-cache policy can utilize FastPath.
Workloads on SSD volumes provide the most performance improvement with FastPath.
The following conditions support
FastPath:
-
Random workloads with small blocks.
-
I/O block sizes smaller than virtual disk’s stripe size.
-
Sequential read workloads on unspanned RAID volumes (RAID 0, RAID 1, RAID 5, and RAID 6).
-
Sequential read and write workloads on RAID 0 virtual disks.
The following conditions do not support
FastPath
-
Virtual disks running background operations like rebuild, initialization, and so on.
-
Spanned RAID volumes like RAID 10, RAID 50, and RAID 60.
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