Release Notes

Table Of Contents

Applies to:

Red Hat Enterprise Linux 7.0 and later.

Solution: The drive must be formatted. For more information, see Red Hat Enterprise Linux Knowledge Base article

5801081.

Systems

affected:

All Dell EMC PowerEdge servers

Tracking number: 192006

Dell EMC OpenManage Storage Services utility fails to

reconfigure the virtual disk

Description: On a system with multiple guest VMs running storage IO and network IO operations, Dell EMC

OpenManage Storage Services utility fails to reconfigure the virtual disk that is connected to the PERC

H755 or PERC H755N card. The dmesg displays following call trace indicating page allocation failure for

high order memory allocation requests:

dsm_sa_datamgrd: page allocation failure: order:6,

mode:0x6000c0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=0-1

dmesg also shows following messages:

megaraid_sas 0000:01:00.0: Failed to alloc kernel SGL buffer for IOCTL

The issue may occur when the operating system is under pressure for high-order memory.

Applies to: Red Hat Enterprise Linux 8.3

Workaround: Reconfigure the virtual disk from the Integrated Dell Remote Access Controller (iDRAC).

Cause: By default, the 'cache' setting for VMs is set to writeback. This results in host memory being used for

buffer cache when storage IO is being performed by guest VMs.

Solution: Modify the 'cache' setting for guest VMs to 'none'. For more information, see Red Hat Enterprise Linux

Knowledge Base article 5905701.

In the XML profile of guest VMs, change the following:

Systems

affected:

All Dell EMC PowerEdge servers

Tracking number: 194332

10 Fixes