Users Guide
I/O device error on write to NVMe PCIe SSD
Description
Windows event log may report the following entries on the rst write attempt to an NVMe PCIe SSD: Event ID
7: The device, \Device\Harddisk\DRX, has a bad block.
When attempting to initialize the device using Computer Management > Storage > Disk Management, the
following message is displayed: Virtual Disk Manager, Data Error (cyclic redundancy
check).
Linux messages log may report the following entries on a write attempt to an NVMe PCIe SSD:
• Buffer I/O error on device nvmeXn1, logical block Y (where X is the number
corresponding to the device and Y is the logical block)
• nvmeXn1: unable to read partition table (where X is the number corresponding
to the device)
Cause NVMe PCIe SSDs have a nite number of write cycles. When an NVMe PCIe SSD exhausts the number of writes,
it goes into Write Protect (Read Only) mode.
Solution By using system management applications, you may check the NVMe PCIe SSD state to conrm if the NVMe PCIe
SSD is in Read-Only Mode. For further instructions, contact a Dell Technical Service representative.
NVMe PCIe SSD performance measurement not optimal
Description
There are a number of factors that may alter the performance of an NVMe PCIe SSD. Dell recommends to take
basic setup measures to ensure performance optimization of these devices.
Cause NVMe PCIe SSD has not been preconditioned and/or BIOS settings are not optimal.
Solution Without preconditioning the NVMe PCIe SSD, performance measurements can be misleading as they may not
reect long-term performance of the device. Preconditioning enables ash management, which stabilizes data
throughput over a period. For the Solid-State Storage Performance Test Specication, see snia.org.
System becomes unresponsive when NVMe PCIe SSD is
surprise removed
Description
System becomes unresponsive when the device is removed without rst preparing the device for removal.
Cause Surprise Removal is not supported in PowerEdge servers for NVMe PCIe SSD.
Solution Execute the Prepare For Removal operation for the specic NVMe PCIe SSD from a Dell Management
application. .
Troubleshooting 11