Users Guide

Performance degradation after disabling SATA
physical disk write cache policy
Likely Cause: Disk write operations can cause degradation in performance.
Corrective
Action:
To resolve this issue, enable the physical disk write cache policy.
NOTE: Ensure that there is constant power supply to the system (A UPS is recommended).
NOTE: If you create a virtual disk using Dell LifeCycle controller, then the physical disk write cache
policy is set to default. For more information about the physical disk write cache policy behavior, see
the Managing the physical disk write cache policy for SATA drives section.
Unable to modify any feature settings in UEFI or
OPROM
Likely cause: You cannot modify the settings in UEFI or OPROM if the number of virtual disks exceeds than 30.
Corrective
Action:
To resolve this issue:
1. Start the operating system.
2. Use OpenManage to ensure that the maximum number of virtual disks does not exceed 30.
Extra reboot during OS installation
Description
The system may reboot one extra time during the OS installation using driver-injection method.
Likely Cause: SATA in RAID mode and NVMe in non-RAID mode may cause an extra reboot on system with NVMe PCIe
SSDs during OS installation.
OS installation failing on NVMe PCIe SSD with third-
party driver
Likely Cause:
Using third-party driver for NVMe PCIe SSD while NVME mode is set to RAID may cause the OS
installation to fail.
Corrective
Action:
Third-party drivers for NVMe PCIe SSDs are not supported in NVMe in RAID mode.
Server performance is slow and crashes during OS
installation on the SATA configuration
Likely Cause:
One or more SAS drives is connected along the SATA drives in the server.
Corrective
Action:
Disconnect the SAS drives connected to the server. SAS drives is not supported on the SATA
configuration.
Troubleshooting your system 45